https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115245
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- In particular cp/mangle.cc implements https://github.com/itanium-cxx-abi/cxx-abi/issues/31#issuecomment-528122117 while demangler does not.
