https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49952
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Last reconfirmed| |2021-12-02 Keywords| |diagnostic Ever confirmed|0 |1 Status|UNCONFIRMED |NEW --- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> --- With -std=c++20, we do warn: <source>:2:21: warning: \U7FFFFFFF is outside the UCS codespace 2 | char32_t s[] = U"\U0010FFFF\U7FFFFFFF"; | ^~~~~~~~~~~~~~~~~~~~~~~ This warning was implemented in r10-3414-g0900e29cdbc5. I wonder if we should just enable it for all C++ standards and above of C++20+.