https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67991
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Try -std=c++1y or -std=c++1z .
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67991
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Try -std=c++1y or -std=c++1z .