[cfe-dev] Question on usage of clang on windows with cmake and ninja

[Victor Leschuk via cfe-dev]

Hello Reid,

thanks a lot for your answer, it helped. As far as I understood from the 
documentation: one needs to use clang-cl if he wants to use visual 
studio runtime. The clang.exe and clang++.exe binaries are intended to 
be used only with mingw runtime (and libc++ is not yet available for 
windows). Am I correct?

On 02/09/2016 01:15 AM, Reid Kleckner wrote:
> Try clang-cl instead, like this:
> $ cmake .. -GNinja -DCMAKE_C_COMPILER=clang-cl 
> -DCMAKE_CXX_COMPILER=clang-cl
>
> If you use the other command line syntax, it looks like CMake has 
> mingw-ish assumptions about what linker flags are valid.
>
> On Sun, Feb 7, 2016 at 3:49 AM, Victor Leschuk via cfe-dev 
> <cfe-dev at lists.llvm.org <mailto:cfe-dev at lists.llvm.org>> wrote:
>
>     Hello all,
>
>     I am currently trying to use clang compiler on Windows 7 (64bit),
>     I have built LLVM and clang from sources (master branch) using VS
>     2015.
>
>     Now I am trying to rebuild the LLVM and clang using clang itself.
>
>     So I am stuck setting correct configuration for cmake.
>
>     I am running the following command:
>
>      $ cmake .. -G "Ninja" -DCMAKE_C_COMPILER=clang
>     -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_C_COMPILER_ID=Clang
>     -DCMAKE_CXX_COMPILER_ID=Clang
>
>     And after that the first test fails with linkage error:
>
>       CMakeFiles\cmTC_8f103.dir\testCCompiler.c.obj -o cmTC_8f103.exe
>       -Wl,--out-implib,libcmTC_8f103.dll.a
>       -Wl,--major-image-version,0,--minor-image-version,0 && cd ."
>
>       LINK : warning LNK4044: unrecognized option '/-out-implib'; ignored
>
>       LINK : warning LNK4044: unrecognized option '/-major-image-version';
>       ignored
>
>       LINK : warning LNK4044: unrecognized option '/-minor-image-version';
>       ignored
>
>       LINK : fatal error LNK1181: cannot open input file
>     'libcmTC_8f103.dll.a'
>
>       clang.exe: error: linker command failed with exit code 1181 (use
>     -v to see
>
>     I have found similar bug:
>
>     https://llvm.org/bugs/show_bug.cgi?id=20868
>
>     However it is for WinXP and is marked as already fixed.
>
>     Also here is similar unsolved discussion SO:
>     http://stackoverflow.com/questions/22585874/building-c-project-on-windows-with-cmake-clang-and-ninja
>
>     Here is clang version which I am trying to use:
>
>     $ clang --version
>     clang version 3.9.0
>     Target: i686-pc-windows-msvc
>     Thread model: posix
>     InstalledDir: C:\Users\del\work\llvm\bin
>
>     It would be great is somebody could point me on what am I doing wrong?
>
>     Thanks in advance!
>
>     --
>     Victor
>
>
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>

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