https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104591
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |INVALID Component|c++ |libstdc++ Status|UNCONFIRMED |RESOLVED --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- std::unary_function has been deprecated since C++11 and is also removed in C++17. Just GCC before 12 did not warn about the deprecatation.