https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104606
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Component|libstdc++ |c++ Target Milestone|--- |11.3 Keywords| |rejects-valid Summary|Regression in comparison |[11/12 Regression] |operator resolution with |comparison operator |std::optional |resolution with | |std::optional and | |-std=c++20 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- I am suspecting a front-end change caused this. clang accepts the same code with libstdc++ which is another reason why I think it might be a front-end issue.