https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69523
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> --- We already support that flag, but the warning that you get on the declaration of operator""s is not controlled by that flag. The warning should be controlled by *some* flag, but I'm not sure whether or not linking it with -Wliteral-suffix makes sense. I'll prepare a patch and see what people think.
