[CMake] [Windows] clang-cl.exe detected as MSVC?

[Konstantin Tokarev]

11.09.2017, 17:59, "Mateusz Loskot" <mateusz at loskot.net>:
> Hi,
>
> I'm building a project with CMake 3.9 using clang-cl.exe driver [1]
> from LLVM/clang 4.0 enabled with Visual Studio 2015 environment.
>
> CMake detects the compiler as Clang 4.0.0:
>
> -- The C compiler identification is Clang 4.0.0
> -- The CXX compiler identification is Clang 4.0.0
> -- Check for working C compiler: C:/Program Files/LLVM/bin/clang-cl.exe
> -- Check for working C compiler: C:/Program Files/LLVM/bin/clang-cl.exe -- works
>
> and my project builds fine.
>
> In my CMakeLists.txt, there is this flags update:
>
> if(MSVC)
>   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP")
> endif()
>
> and in build log I see:
>
> clang-cl.exe: warning: argument unused during compilation: '/MP'
>
> I have double-checked and MSVC is defined and set True for clang-cl.exe.
>
> Is this correct?

Yes. clang-cl is mostly compatible with MSVC on the command line, so it's natural
that MSVC code in existing projects is applied to clang-cl too.

> Is clang-cl.exe driver considered to be "when using Microsoft Visual C++" [2]
>
> [1] https://clang.llvm.org/docs/UsersManual.html#clang-cl
> [2] https://cmake.org/cmake/help/v3.9/variable/MSVC.html
>
> Best regards,
> --
> Mateusz Loskot, http://mateusz.loskot.net
> --
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-- 
Regards,
Konstantin