https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97163 --- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> --- It can be anything > 4.2 (because clang pretends to be GCC 4.2). 4.5 was just because the other altivec section was >= 4.5. PR45381 contains some details about that.