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commit    9e9a31bd009663bcdd5e676d6012ee691d8944b6
Author:   Tom Lane <tgl@sss.pgh.pa.us>
Date:     Fri Nov 20 05:58:26 2020 +0000
First released in: 14.0, 9.5.25, 9.6.21, 10.16, 11.11, 12.6, 13.2

    On macOS, use -isysroot in link steps as well as compile steps.
    
    We previously put the -isysroot switch only into CPPFLAGS, theorizing
    that it was only needed to find the right copies of include files.
    However, it seems that we also need to use it while linking programs,
    to find the right stub ".tbd" files for libraries.  We got away
    without that up to now, but apparently that was mostly luck.  It may
    also be that failures are only observed when the Xcode version is
    noticeably out of sync with the host macOS version; the case that's
    prompting action right now is that builds fail when using latest Xcode
    (12.2) on macOS Catalina, even though it's fine on Big Sur.
    
    Hence, add -isysroot to LDFLAGS as well.  (It seems that the more
    common practice is to put it in CFLAGS, whence it'd be included at
    both compile and link steps.  However, we can't mess with CFLAGS in
    the platform template file without confusing configure's logic for
    choosing default CFLAGS.)
    
    Back-patch of 49407dc32 into all supported branches.
    
    Report and patch by James Hilliard (some cosmetic mods by me)
    
    Discussion: https://postgr.es/m/20201120003314.20560-1-james.hilliard1@gmail.com


 configure           | 2 ++
 configure.in        | 2 ++
 src/template/darwin | 1 +
 3 files changed, 5 insertions(+)

diff --git a/configure b/configure
index f223eb28731..6f02d509671 100755
--- a/configure
+++ b/configure
@@ -19088,8 +19088,10 @@ _ACEOF
 # literally, so that it's possible to override it at build time using
 # a command like "make ... PG_SYSROOT=path".  This has to be done after
 # we've finished all configure checks that depend on CPPFLAGS.
+# The same for LDFLAGS, too.
 if test x"$PG_SYSROOT" != x; then
   CPPFLAGS=`echo "$CPPFLAGS" | sed -e "s| $PG_SYSROOT | \\\$(PG_SYSROOT) |"`
+  LDFLAGS=`echo "$LDFLAGS" | sed -e "s| $PG_SYSROOT | \\\$(PG_SYSROOT) |"`
 fi
 
 
diff --git a/configure.in b/configure.in
index 8d4e9ac5913..af816e30dba 100644
--- a/configure.in
+++ b/configure.in
@@ -2351,8 +2351,10 @@ AC_SUBST(PG_VERSION_NUM)
 # literally, so that it's possible to override it at build time using
 # a command like "make ... PG_SYSROOT=path".  This has to be done after
 # we've finished all configure checks that depend on CPPFLAGS.
+# The same for LDFLAGS, too.
 if test x"$PG_SYSROOT" != x; then
   CPPFLAGS=`echo "$CPPFLAGS" | sed -e "s| $PG_SYSROOT | \\\$(PG_SYSROOT) |"`
+  LDFLAGS=`echo "$LDFLAGS" | sed -e "s| $PG_SYSROOT | \\\$(PG_SYSROOT) |"`
 fi
 AC_SUBST(PG_SYSROOT)
 
diff --git a/src/template/darwin b/src/template/darwin
index f4d4e9d7cf8..32414d21a98 100644
--- a/src/template/darwin
+++ b/src/template/darwin
@@ -11,6 +11,7 @@ fi
 if test x"$PG_SYSROOT" != x"" ; then
   if test -d "$PG_SYSROOT" ; then
     CPPFLAGS="-isysroot $PG_SYSROOT $CPPFLAGS"
+    LDFLAGS="-isysroot $PG_SYSROOT $LDFLAGS"
   else
     PG_SYSROOT=""
   fi


[parent: 98f3f1d5c1bf]