https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119923
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- >For comparison, Clang in MinGW mode doesn't allow neither of those, and I >couldn't find any flag to enable them. Most likely because clang started to support mingw way after Visual Studio 2005 was released while GCC started to support windows/mingw before that.