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Further tweaking of PG_SYSROOT heuristics for macOS.

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It emerges that in some phases of the moon (perhaps to do with
directory entry order?), xcrun will report that the SDK path is
  /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk
which is normally a symlink to a version-numbered sibling directory.
Our heuristic to skip non-version-numbered pathnames was rejecting
that, which is the wrong thing to do.  We'd still like to end up
with a version-numbered PG_SYSROOT value, but we can have that by
dereferencing the symlink.

Like the previous fix, back-patch to all supported versions.

Discussion: https://postgr.es/m/522433.1611089678@sss.pgh.pa.us
This commit is contained in:
Tom Lane 2021-01-20 12:07:23 -05:00
parent c2dc1a7976
commit 9d23c15a03
1 changed files with 13 additions and 6 deletions
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19
src/template/darwin
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@ -7,13 +7,20 @@
if test x"$PG_SYSROOT" = x"" ; then
# This is far more complicated than it ought to be. We first ask
# "xcrun --show-sdk-path", which seems to match the default -isysroot
# setting of Apple's compilers. However, that may produce no result or
# a result that is not version-specific (i.e., just ".../SDKs/MacOSX.sdk").
# Using a version-specific sysroot seems desirable, so if there are not
# digits in the directory name, try "xcrun --sdk macosx --show-sdk-path";
# and if that still doesn't work, fall back to asking xcodebuild,
# which is often a good deal slower.
# setting of Apple's compilers.
PG_SYSROOT=`xcrun --show-sdk-path 2>/dev/null`
# That may fail, or produce a result that is not version-specific (i.e.,
# just ".../SDKs/MacOSX.sdk"). Using a version-specific sysroot seems
# desirable, so if the path is a non-version-specific symlink, expand it.
if test -L "$PG_SYSROOT"; then
if expr x"$PG_SYSROOT" : '.*[0-9]\.[0-9][^/]*$' >/dev/null ; then : okay
else
PG_SYSROOT=`expr "$PG_SYSROOT" : '\(.*\)/'`/`readlink "$PG_SYSROOT"`
fi
fi
# If there are still not digits in the directory name, try
# "xcrun --sdk macosx --show-sdk-path"; and if that still doesn't work,
# fall back to asking xcodebuild, which is often a good deal slower.
if expr x"$PG_SYSROOT" : '.*[0-9]\.[0-9][^/]*$' >/dev/null ; then : okay
else
PG_SYSROOT=`xcrun --sdk macosx --show-sdk-path 2>/dev/null`