[CMake] Is there any way to use clang-cl with MSBuild on Windows?

[Gilles Khouzam]

Hi Yi-Long


Clang-Cl requires a few changes in order to work properly,


I've prototyped the support for Clang-Cl on our CMake fork with the plan to integrate the support once we've got good confirmation and work through some of the design issues.


You can find the code on https://github.com/microsoft/cmake/tree/feature/clang_3_7


You can also find an installer here: https://github.com/Microsoft/CMake/releases


The easiest way to set Clang as the compiler is to use the -T parameter such as

cmake -G "Visual Studio 14 2015" -T v140_clang_3_7 ...


But I've also added a new variable VS_PLATFORM_TOOLSET_OVERRIDE that you can use to change the toolset for a specific target (there are scenarios where you need CL and Clang targeting different projects in your solution).


Thanks


~Gilles

________________________________
From: CMake <cmake-bounces at cmake.org> on behalf of Yi-Hong Lyu <b95705030 at ntu.edu.tw>
Sent: Sunday, January 31, 2016 10:47:58 AM
To: Nicholas Braden
Cc: cmake at cmake.org
Subject: Re: [CMake] Is there any way to use clang-cl with MSBuild on Windows?

Hello Bill,

If I generate the ALL_BUILD.vcxproj for MSVC 19.0.23506.0 as usual, I can use command "msbuild ALL_BUILD.vcxproj /p:cltoolexe=clang-cl" to build the project using clang-cl. However it might include wrong directory like C:\\Program Files (x86)\Windows Kits\10\Include\10.0.10240.0\ucrt during building when I build library libcxx. Is there any way to overwrite variables such as ExcludePath, IncludePath, UniversalCRT_IncludePath and VC_IncludePath?

Hello Nicholas,

Which value should I put for -T parameter?

BTW, is CMAKE_TOOLCHAIN_FILE able to used in this situation?

Thanks

2016-01-30 8:33 GMT+08:00 Nicholas Braden <nicholas11braden at gmail.com<mailto:nicholas11braden at gmail.com>>:
Have you tried setting the toolset? The -T parameter can set the
toolset. This sets the platform toolset property that you would
normally set in Visual Studio. if Visual Studio lets you select the
llvm platform toolset, so will CMake.

On Fri, Jan 29, 2016 at 12:04 PM, Yi-Hong Lyu <b95705030 at ntu.edu.tw<mailto:b95705030 at ntu.edu.tw>> wrote:
> Hello everyone,
>
> I am a newbie of CMake. I would like to use clang-cl with MSBuild on
> Windows. However it always use MSVC 19.0.23506.0 as the identified compiler
> even I defined CMAKE_C_COMPILER / CMAKE_CXX_COMPILER /
> CMAKE_C_COMPILER_FORCED / CMAKE_CXX_COMPILER_FORCED:
>
> $ cmake -DCMAKE_C_COMPILER=clang-cl -DCMAKE_CXX_COMPILER=clang-cl
> -DCMAKE_C_COMPILER_FORCED=ON -DCMAKE_CXX_COMPILER_FORCED=ON ..\src\
> -- Building for: Visual Studio 14 2015
> -- The CXX compiler identification is MSVC 19.0.23506.0
> -- The C compiler identification is MSVC 19.0.23506.0
> -- Configuring for standalone build.
> -- Found PythonInterp: C:/Python34/python.exe (found version "3.4.4")
> -- Sphinx disabled.
> .
> .
> .
>
> PS. The environment PATH is already set to clang-cl.
>
> I am wondering whether there is any option that I can force MSBuild use
> clang-cl instead.
>
> Thanks,
> Yi-Hong
>
> --
>
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