https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124252
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- >Regression since GCC 6.1 Not really gcc 5.x defaulted to -std=gnu++98 while GCC 6 defaults to -std=gnu++11. Adding -std=c++11 to GCC 5 gets the same behavior as GCC 6.
