https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64867
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> --- Jason informs me it's now a warning enabled by -Wconditionally-supported
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64867
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> --- Jason informs me it's now a warning enabled by -Wconditionally-supported