https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80868
--- Comment #5 from Nick Desaulniers <ndesaulniers at google dot com> --- Oh, note in the typedef case: typedef const int t; const t x; It seems that for -std=c89 (non pedantic, non GNU), GCC does not warn. That seems to violate C90 6.5.3 constraints: "The same type qualifier shall not appear more than once in the same specifier-list or qualifier-list, either directly or via one or more typedefs."
