Clang: Diagnose unsupported GNU-like clang targeting MSVC ABI
The LLVM/Clang installer on Windows provides a
clang++.exe command-line tools that have a
GNU-like command-line but target the MSVC ABI (instead of MinGW). We
do not support this combination, so diagnose and reject it explicitly.
Tell users what to do to use the
clang-cl.exe tool instead.
Issue: #16439 (closed)