postgresql/config
Tom Lane 0909380e4c Allow PG_PRINTF_ATTRIBUTE to be different in C and C++ code.
Although clang claims to be compatible with gcc's printf format
archetypes, this appears to be a falsehood: it likes __syslog__
(which gcc does not, on most platforms) and doesn't accept
gnu_printf.  This means that if you try to use gcc with clang++
or clang with g++, you get compiler warnings when compiling
printf-like calls in our C++ code.  This has been true for quite
awhile, but it's gotten more annoying with the recent appearance
of several buildfarm members that are configured like this.

To fix, run separate probes for the format archetype to use with the
C and C++ compilers, and conditionally define PG_PRINTF_ATTRIBUTE
depending on __cplusplus.

(We could alternatively insist that you not mix-and-match C and
C++ compilers; but if the case works otherwise, this is a poor
reason to insist on that.)

No back-patch for now, but we may want to do that if this
patch survives buildfarm testing.

Discussion: https://postgr.es/m/986485.1764825548@sss.pgh.pa.us
2025-12-10 17:09:10 -05:00
..
ax_pthread.m4 Update config/ax_pthread.m4 to latest upstream version. 2018-11-19 15:05:33 -05:00
c-compiler.m4 Allow PG_PRINTF_ATTRIBUTE to be different in C and C++ code. 2025-12-10 17:09:10 -05:00
c-library.m4 Simplify checking for xlocale.h 2024-10-01 07:23:45 -04:00
check_decls.m4 Fix configure's AC_CHECK_DECLS tests to work correctly with clang. 2018-11-19 12:01:47 -05:00
check_modules.pl Update copyright for 2025 2025-01-01 11:21:55 -05:00
config.guess Update config.guess and config.sub 2025-04-09 12:41:54 +02:00
config.sub Update config.guess and config.sub 2025-04-09 12:41:54 +02:00
general.m4 Rename configure.in to configure.ac 2020-07-24 10:42:08 +02:00
install-sh Fix install-strip on Mac OS X 2012-08-21 23:42:43 -04:00
llvm.m4 Don't put library-supplied -L/-I switches before user-supplied ones. 2025-07-29 15:17:40 -04:00
Makefile Install our "missing" script where PGXS builds can find it. 2015-12-11 16:15:05 -05:00
meson.build meson: Add initial version of meson based build system 2022-09-21 22:37:17 -07:00
missing Remove cvs keywords from all files. 2010-09-20 22:08:53 +02:00
perl.m4 Remove MSVC scripts 2023-12-20 09:44:37 +09:00
pkg.m4 Fix collection of typos in the code and the documentation 2022-03-15 11:29:35 +09:00
prep_buildtree Improve prep_buildtree 2025-08-04 14:06:58 +02:00
programs.m4 Don't put library-supplied -L/-I switches before user-supplied ones. 2025-07-29 15:17:40 -04:00
python.m4 Unify DLSUFFIX on Darwin 2022-07-06 07:41:33 +02:00
tcl.m4 configure: More use of AC_ARG_VAR 2019-01-18 08:38:34 +01:00