https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98566
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> --- (In reply to Marek Polacek from comment #4) > C++ tests aren't run in C++11 mode unless specified by GXX_TESTSUITE_STDS > (to alleviate testing times). Or one can use make check-c++-all