https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119391
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> --- It changed from long to intmax_t with https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1988.pdf But even with long, it should have been accepted for LP64 targets.