https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65341
--- Comment #14 from Martin Sebor <msebor at gcc dot gnu.org> --- I'm confused: I thought gcc defining the _ARCH_PWR6 macro in response to -mcpu=power6 or some such implied that the target was power6. Shouldn't gcc then also invoke the assembler with the -mpower6 option to make sure it's also in power6 mode? Incidentally, the background on the glibc code is here: http://sourceware.org/bugzilla/show_bug.cgi?id=10118
