http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60481
--- Comment #2 from Dmitry Gorbachev <d.g.gorbachev at gmail dot com> --- Yes, it seems that it is on (there is an error with -fno-ms-extensions), but: $ i686-w64-mingw32-g++-4.9.0 -Q --help=c++ | grep ms-ext -fms-extensions [disabled]