https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111366
--- Comment #10 from Kewen Lin <linkw at gcc dot gnu.org> --- (In reply to Jan Wassenberg from comment #5) > Thanks for reporting this. One might think this is caused by -mcpu=power9 > clashing with our #pragma target altivec,vsx,power8-vector. > > However, what makes this seem like an actual bug is that -flto=auto is > additionally required to trigger the bug. This reminds me there is one bug in the current function rs6000_can_inline_p, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102059#c17 -flto=auto makes the callee have a constructed DECL_FUNCTION_SPECIFIC_TARGET, so callee_tree is not NULL, it would further check ISA flags. Without it, the current implementation doesn't adopt the default option node and just ignore it unexpectedly. Filed PR111380.
