[Bug driver/103949] gcc fails to provide a standard conforming C11 or C++17 environment even when specifying -std=c11 or -std=c++17

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103949

--- Comment #14 from Jonathan Wakely <redi at gcc dot gnu.org> ---
What is the output of x86_64-w64-mingw32-g++-posix -v