From: Justin Pryzby <pryzbyj@telsasoft.com>
Date: Wed, 25 May 2022 21:53:22 -0500
Subject: [PATCH 4/8] cirrus/windows: add compiler_warnings_script

I'm not sure how to write this test in windows shell; it's also not easy to
write it in posix sh, since windows shell is somehow interpretting && and ||...

https://www.postgresql.org/message-id/20220212212310.f645c6vw3njkgxka%40alap3.anarazel.de

See also:
8a1ce5e54f6d144e4f8e19af7c767b026ee0c956
https://cirrus-ci.com/task/6241060062494720
https://cirrus-ci.com/task/6496366607204352

ci-os-only: windows
---
 .cirrus.yml                            | 10 +++++++++-
 src/tools/ci/windows-compiler-warnings | 24 ++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 1 deletion(-)
 create mode 100755 src/tools/ci/windows-compiler-warnings

diff --git a/.cirrus.yml b/.cirrus.yml
index 9f2282471a9..99ac09dc679 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -451,12 +451,20 @@ task:
 
   build_script: |
     vcvarsall x64
-    ninja -C build
+    ninja -C build |tee build/meson-logs/build.txt
+    REM Since pipes lose exit status of the preceding command, rerun compilation,
+    REM without the pipe exiting now if it fails, rather than trying to run checks
+    ninja -C build > nul
 
   check_world_script: |
     vcvarsall x64
     meson test %MTEST_ARGS% --num-processes %TEST_JOBS%
 
+  # This should be last, so check_world is always run
+  always:
+    compiler_warnings_script:
+      - sh src\tools\ci\windows-compiler-warnings build/meson-logs/build.txt build/meson-logs/build-warnings.txt
+
   on_failure:
     <<: *on_failure_meson
     crashlog_artifacts:
diff --git a/src/tools/ci/windows-compiler-warnings b/src/tools/ci/windows-compiler-warnings
new file mode 100755
index 00000000000..685aa995d5c
--- /dev/null
+++ b/src/tools/ci/windows-compiler-warnings
@@ -0,0 +1,24 @@
+#! /bin/sh
+# Success if the given exists and is empty, else fail
+# This is a separate file to avoid dealing with windows shell quoting and escaping,
+# or giving the impression that one-liner scripts will work trivially.
+set -e
+
+infile=$1
+outfile=$2
+
+# Looks like:
+# [19:39:27.130] c:\cirrus\src\backend\backup\basebackup_zstd.c(80) : warning C4715: 'bbsink_zstd_new': not all control paths return a value
+# should include linker warnings?
+grep ": warning " "$infile" > $outfile ||
+	[ $? -eq 1 ]
+
+if [ -s "$outfile" ]
+then
+	# Display the file's content, then exit indicating failure
+	cat "$outfile"
+	exit 1
+else
+	# Success
+	exit 0
+fi
-- 
2.25.1


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