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

[Steven Stallion]

A selfish request: would it be possible to slip this into the 3.5
release? This is something that I (and the company I work for) are
very interested in, and I would like to avoid pulling a fork into our
workstream.

Cheers,

Steve

On Mon, Feb 1, 2016 at 8:47 AM, Gilles Khouzam
<Gilles.Khouzam at microsoft.com> wrote:
> 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>:
>>
>> 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>
>> 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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>
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