https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61920
--- Comment #6 from Ulrich Weigand <uweigand at gcc dot gnu.org> --- Since we didn't backport the actual ABI change to the branches, only the warning, I think it would be consistent to use something like this on the branches: #define rs6000_special_adjust_field_align_p(FIELD, COMPUTED) \ (TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE) rather than the #define ... 0 that is appropriate for mainline.