[libcxx-commits] [libcxx] [libcxx] [test] Detect mingw-w64 headers compatible with C++ module builds (PR #92893)

[Martin Storsjö via libcxx-commits]

mstorsjo wrote:

@cjacek Does the version check look reasonable to you? Ideally it would be enough to just check `__MINGW64_VERSION_MAJOR`, but we need to distinguish between many different git snapshots that all have `__MINGW64_VERSION_MAJOR == 12`. (libcxx CI currently uses https://github.com/mstorsjo/llvm-mingw/releases/tag/20231128 which is an older mingw-w64 git snapshot that also is at `__MINGW64_VERSION_MAJOR == 12`. There's a new tagged release of mingw-w64 coming up soon, but that will be the stable v12, so anybody using that version would also be indistinguishable from the earlier v12 snapshots.)

https://github.com/llvm/llvm-project/pull/92893