https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100186
--- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> --- > The fact that something is in C++11 doesn't mean we can assume it in GCC, > while GCC 4.8.x which we still want to support had roughly complete C++11 FE > support, I think the libstdc++ side wasn't there yet. Do we really support it? https://gcc.gnu.org/install/prerequisites.html mentions that an 'ISO C++11 compiler' is required.