https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69348
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to David Friberg from comment #2) > Another similar but more common (/less contrived) example, rejects-valid > e.g. for GCC 10.1.0 for all C++ version (-std=c++X with X in {98, 11, 17, > 2a/20}). This is a different issue and should be filed seperately.