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0909380e4c
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