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[PATCH] Turn protective Assert() into elog(ERROR)
266+ messages / 2 participants
[nested] [flat]

* [PATCH] Turn protective Assert() into elog(ERROR)
@ 2026-05-01 07:23 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Álvaro Herrera @ 2026-05-01 07:23 UTC (permalink / raw)

---
 src/backend/access/index/genam.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/backend/access/index/genam.c b/src/backend/access/index/genam.c
index 97d44b84622..7d401e3f137 100644
--- a/src/backend/access/index/genam.c
+++ b/src/backend/access/index/genam.c
@@ -396,11 +396,13 @@ systable_beginscan(Relation heapRelation,
 
 	/*
 	 * If this backend promised that it won't access shared catalogs during
-	 * logical decoding, this it the right place to verify.
+	 * logical decoding, this is the right place to verify.
 	 */
-	Assert(!HistoricSnapshotActive() ||
-		   accessSharedCatalogsInDecoding ||
-		   !heapRelation->rd_rel->relisshared);
+	if (HistoricSnapshotActive() &&
+		!accessSharedCatalogsInDecoding &&
+		heapRelation->rd_rel->relisshared)
+		elog(ERROR,
+			 "cannot access shared catalog with database-specific historic snapshot");
 
 	if (indexOK &&
 		!IgnoreSystemIndexes &&
-- 
2.47.3


--k6vxbflu22czkb7a--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread

* [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc
@ 2026-07-15 19:27 Andres Freund <andres@anarazel.de>
  0 siblings, 0 replies; 266+ messages in thread

From: Andres Freund @ 2026-07-15 19:27 UTC (permalink / raw)

Unfortunately the combination of gcc, precompiled headers, ccache and meson
currently is not safe without further options. The dependencies emitted by gcc
are insufficient to trigger rebuilds when headers "below" the precompiled
headers are changed. Whether that's a ccache, gcc or meson bug is
debatable. Luckily gcc's -fpch-deps option fixes the issue.

This problem occasionally leads to build failures, e.g. if only c.h,
postgres.h or pg_config_manual.h change. That's e.g. the case when creating a
new major version branch.

Discussion: https://postgr.es/m/CAN55FZ0tqR6Xz%3DiVFLc1BBoLOEHU775ARhcGYwggHA3XLA%3DoQg%40mail.gmail.com
Discussion: https://postgr.es/m/CA+hUKG+s7Yvt0PUnSQUEjCjysV-7-51n9B1h468Le3VJi0x4ZQ@mail.gmail.com
Discussion: https://postgr.es/m/phsrssp75npoyalqsolcd7fmnmlbzbmquc2p7w7mqjlw7432jk@bzskz3luyjvb
Discussion: https://github.com/ccache/ccache/issues/1686
Backpatch-through: 16, where meson support was added
---
 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index 61b5681851e..f4cde249242 100644
--- a/meson.build
+++ b/meson.build
@@ -2185,6 +2185,12 @@ common_functional_flags = [
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   '-fwrapv',
   '-fexcess-precision=standard',
+  # Without -fpch-deps gcc emits dependencies that are insufficient for ccache
+  # to trigger a rebuild when the precompiled header changes. We could make
+  # this depend on using gcc and precompiled headers being enabled, but that's
+  # probably not worth it.  See also
+  # https://github.com/ccache/ccache/issues/1686
+  '-fpch-deps',
 ]
 
 cflags += cc.get_supported_arguments(common_functional_flags)
-- 
2.54.0.450.g9ac3f193c0


--lrkjybh77g2jf2vx--





^ permalink  raw  reply  [nested|flat] 266+ messages in thread


end of thread, other threads:[~2026-07-15 19:27 UTC | newest]

Thread overview: 266+ messages (download: mbox mbox.gz follow: Atom feed)
-- links below jump to the message on this page --
2026-05-01 07:23 [PATCH] Turn protective Assert() into elog(ERROR) Álvaro Herrera <alvherre@kurilemu.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>
2026-07-15 19:27 [PATCH v2] meson: Fix ccache issues when using precompiled headers with gcc Andres Freund <andres@anarazel.de>

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