llvm-project

4e6c8f1d - [clang] [MinGW] Set a predefined __GXX_TYPEINFO_EQUALITY_INLINE=0 for MinGW targets (#96062)

[clang] [MinGW] Set a predefined __GXX_TYPEINFO_EQUALITY_INLINE=0 for MinGW targets (#96062) libstdc++ requires this define to match what is predefined in GCC for the ABI of this platform; GCC hardcodes this define for all mingw configurations in gcc/config/i386/cygming.h. (It also defines __GXX_MERGED_TYPEINFO_NAMES=0, but that happens to match the defaults in libstdc++ headers, so there's no similar need to define it in Clang.) This fixes a Clang/libstdc++ interop issue discussed at https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110572.