https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91595
--- Comment #10 from Brecht Sanders <brechtsanders at users dot sourceforge.net> --- I thought MinGW-w64 is it's own C library. It is found by GCC build process because the folder mingw exists in the location specified with --with-build-sysroot CppRuntime_Gcc is mentioned in the predefs, why would CRuntime_Gcc not be defined then?
