Buildfarm animal conchuela recently started spitting a lot of warnings like this one: conchuela | 2022-08-06 12:35:46 | /home/pgbf/buildroot/HEAD/pgsql.build/../pgsql/src/include/port.h:208:70: warning: 'format' attribute argument not supported: gnu_printf [-Wignored-attributes] I first thought we'd broken something, but upon digging through the buildfarm history, the oldest build showing these warnings is https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=conchuela&dt=2022-07-18%2020%3A20%3A18 The new commits in that build don't look related, but what does look related is that the choice of C++ compiler changed: configure: using compiler=gcc 8.3 [DragonFly] Release/2019-02-22 configure: using CXX=ccache clang++14 vs configure: using compiler=gcc 8.3 [DragonFly] Release/2019-02-22 configure: using CXX=g++ This is seemingly an intentional configuration change, because the animal is reporting different config_env than before. However, we decide what to set PG_PRINTF_ATTRIBUTE to based on what CC likes, and if CXX doesn't like it then you'll get these warnings. (The warnings only appear in C++ compiles, else there'd REALLY be a lot of them.) Is it worth the trouble to try to set PG_PRINTF_ATTRIBUTE differently in C and C++ builds? I doubt it. Probably the right fix for this is to use matched C and C++ compilers, either both clang or both gcc. I fear that inconsistency could lead to bigger problems than some warnings. regards, tom lane