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Ismail Donmez authored
The check added by commit v3.10.0-rc2~2^2 (Clang: Diagnose unsupported GNU-like clang targeting MSVC ABI, 2017-10-10) is incorrectly detecting clang-cl 6.0 as GNU-like. Currently cmake is testing if the clang compiler accepts `--version` to see if it accepts GNU style flags. However, with the latest llvm snapshot this also works for clang-cl: > clang-cl --version clang version 6.0.0 (trunk) Target: x86_64-pc-windows-msvc Thread model: posix InstalledDir: C:\Program Files\LLVM\bin So instead we should use the `/?` flag which fails with clang but works with clang-cl: > clang-cl /? &> /dev/null; echo $? 0 > clang /? &> /dev/null; echo $? 1 Fixes: #17518