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Tom Lane 8e5e3ff556 Don't put library-supplied -L/-I switches before user-supplied ones. ... For many optional libraries, we extract the -L and -l switches needed to link the library from a helper program such as llvm-config. In some cases we put the resulting -L switches into LDFLAGS ahead of -L switches specified via --with-libraries. That risks breaking the user's intention for --with-libraries. It's not such a problem if the library's -L switch points to a directory containing only that library, but on some platforms a library helper may "helpfully" offer a switch such as -L/usr/lib that points to a directory holding all standard libraries. If the user specified --with-libraries in hopes of overriding the standard build of some library, the -L/usr/lib switch prevents that from happening since it will come before the user-specified directory. To fix, avoid inserting these switches directly into LDFLAGS during configure, instead adding them to LIBDIRS or SHLIB_LINK. They will still eventually get added to LDFLAGS, but only after the switches coming from --with-libraries. The same problem exists for -I switches: those coming from --with-includes should appear before any coming from helper programs such as llvm-config. We have not heard field complaints about this case, but it seems certain that a user attempting to override a standard library could have issues. The changes for this go well beyond configure itself, however, because many Makefiles have occasion to manipulate CPPFLAGS to insert locally-desirable -I switches, and some of them got it wrong. The correct ordering is any -I switches pointing at within-the- source-tree-or-build-tree directories, then those from the tree-wide CPPFLAGS, then those from helper programs. There were several places that risked pulling in a system-supplied copy of libpq headers, for example, instead of the in-tree files. (Commit cb36f8ec2 fixed one instance of that a few months ago, but this exercise found more.) The Meson build scripts may or may not have any comparable problems, but I'll leave it to someone else to investigate that. Reported-by: Charles Samborski <demurgos@demurgos.net> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/70f2155f-27ca-4534-b33d-7750e20633d7@demurgos.net Backpatch-through: 13		1 month ago
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Makefile	…
ax_pthread.m4	Update config/ax_pthread.m4 to latest upstream version.	7 years ago
c-compiler.m4	Include _mm512_zextsi128_si512() in AVX-512 configure probes.	3 months ago
c-library.m4	Simplify checking for xlocale.h	12 months ago
check_decls.m4	…
check_modules.pl	Update copyright for 2025	8 months ago
config.guess	Update config.guess and config.sub	5 months ago
config.sub	Update config.guess and config.sub	5 months ago
general.m4	Rename configure.in to configure.ac	5 years ago
install-sh	…
llvm.m4	Don't put library-supplied -L/-I switches before user-supplied ones.	1 month ago
meson.build	meson: Add initial version of meson based build system	3 years ago
missing	…
perl.m4	Remove MSVC scripts	2 years ago
pkg.m4	Fix collection of typos in the code and the documentation	4 years ago
prep_buildtree	Fix vpath build	7 years ago
programs.m4	Don't put library-supplied -L/-I switches before user-supplied ones.	1 month ago
python.m4	Unify DLSUFFIX on Darwin	3 years ago
tcl.m4	configure: More use of AC_ARG_VAR	7 years ago