https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58091
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> --- clang started to reject it in clang 9.
pinskia at gcc dot gnu.org via Gcc-bugs Thu, 22 Jul 2021 17:40:45 -0700
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58091
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> --- clang started to reject it in clang 9.