https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89519
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Matt Whitlock from comment #3) > ABI compatibility isn't guaranteed across C++ language standards anyway, is > it? For instance, the ABI of std::string differs between C++98 and C++11. What you are thinking about is the old std::string and the new C++11 compatible std::string. std::string is not different between C++98 and C++11 in GCC; both use the new std::string.