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#!/bin/sh
#
# Select where system include files should be sought. If the user specified a
# sysroot, validate it.
#
# A separate script so it can be shared between autoconf and meson.
PG_SYSROOT=$1
if test x"$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.
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][^/]*$' >/dev/null ; then : okay
else
PG_SYSROOT=`xcrun --sdk macosx --show-sdk-path 2>/dev/null`
if expr x"$PG_SYSROOT" : '.*[0-9]\.[0-9][^/]*$' >/dev/null ; then : okay
else
PG_SYSROOT=`xcodebuild -version -sdk macosx Path 2>/dev/null`
fi
fi
fi
# Validate the result: if it doesn't point at a directory, ignore it.
if test x"$PG_SYSROOT" != x"" ; then
if test -d "$PG_SYSROOT" ; then
echo $PG_SYSROOT
fi
fi
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