https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109936
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |INVALID Status|UNCONFIRMED |RESOLVED --- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Jonathan Wakely from comment #5) > I think > https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p1949r7.html is the > most relevant paper. Right this is the correct paper. I misread the commit logs to find the right one. Also see PR 67224 which is what changed behavior in GCC 10 to reject ≠ as not a valid identifier (p1949r7 paper references preprocessor here too). Again this is all expected.