https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105043
--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Eric Gallager from comment #5) > it's not *just* a glibc feature; Darwin Libc uses the same macro, too, for > example Yes and Darwin (and FreeBSD, OpenBSD, NetBSD, etc.) should document it in their libc too.
