[CMake] Problem using VS-compiled Clang as a C/C++ compiler.

[Cristian Adam]

Hi Anton,

clang.exe doesn't know of any windows specific things.  Clang-cl instead
does.

Just make sure to have clang-cl before msvc-cl in path and ninja will just
work.

Cheers,
Cristian
On Mar 4, 2016 01:31, "Anton Yartsev" <anton.yartsev at gmail.com> wrote:

> Hi all,
>
> I'm trying to use Clang, compiled with VS 2013 (configuration:Release,
> platform:x64) as a C/C++ compiler for a simple HelloWorld CMake project.
> Generation ends up with errors like "clang.exe: error: no such file or
> directory: '/DWIN32'" at compiler check stage. If I understand correctly
> the problem is that MSVC compiler options are fed to Clang for some reason
> (maybe the "-- The C compiler identification is unknown" log entry is
> related to the problem?).
> Could anyone help to resolve this, please?
>
> I also tried to change compiler ID with "-DCMAKE_C_COMPILER_ID=Clang
> -DCMAKE_CXX_COMPILER_ID=Clang", then compilation succeeded, but linkage
> failed (just as described in the thread "Question on usage of cmake on
> Windows with clang"
> http://thread.gmane.org/gmane.comp.programming.tools.cmake.user/54650).
> Here the problem seems to be reversed: GNU linker options are fed to MS
> linker.
>
> ************** Setup and details:
> 1) INCLUDE and PATH set to clang/clang-cl
> 2) command line environment is configured with vsvars32.bat
> 3) CC and CXX set to clang
>
> $ cat CMakeLists.txt
> project(test_project)
> add_executable(main file.cpp)
>
> $ cmake -G "Ninja" -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang ..
>
> Log:
> -- The C compiler identification is unknown
> -- The CXX compiler identification is Clang 3.7.1
> -- Check for working C compiler using: Ninja
> -- Check for working C compiler using: Ninja -- broken
> CMake Error at C:/Program
> Files/CMake/share/cmake-3.5/Modules/CMakeTestCCompiler.cmake:61 (message):
>   The C compiler "D:/-Work-/llvm-3.7.1.src/-VS_build VS
>   2013-/Release/bin/clang.exe" is not able to compile a simple test
> program.
>   It fails with the following output:
>    Change Dir: D:/-Work-/llvm-3.7.1.src/-CLANG-/CMakeFiles/CMakeTmp
>
>   Run Build Command:"C:/PROGRA~1/ninja/ninja.exe" "cmTC_2cb9d"
>
>   [1/2] Building C object CMakeFiles\cmTC_2cb9d.dir\testCCompiler.c.obj
>
>   FAILED: D:\-Work-\LLVM-3~2.SRC\-VS_BU~2\Release\bin\clang.exe /DWIN32
>   /D_WINDOWS /W3 -o CMakeFiles\cmTC_2cb9d.dir\testCCompiler.c.obj -c
>   testCCompiler.c
>
>   clang.exe: error: no such file or directory: '/DWIN32'
>   clang.exe: error: no such file or directory: '/D_WINDOWS'
> ...
>
> OS: Windows 7 (x64)
>
> clang version 3.7.1 (tags/RELEASE_371/final)
> Target: x86_64-pc-windows-msvc
> Thread model: posix
>
> cmake version 3.5.0-rc3
>
> Thank you!
>
> --
> Anton
>
> --
>
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