https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91135
Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jakub at gcc dot gnu.org --- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- In 8 and earlier this has been defined through CPP_OS_LINUX_SPEC, i.e. it was a driver that predefined it, guess r266493 changed this. TARGET_OS_CPP_BUILTINS now does: if (strcmp (rs6000_abi_name, "linux") == 0) \ GNU_USER_TARGET_OS_CPP_BUILTINS(); \ and as with -mcall-aixdesc rs6000_abi_name is not linux, but aixdesc, this doesn't trigger.