无法使用Visual Studio 2015在Windows 10上构建LLVM

Question

I'm trying to install LLVM on Windows 10 using Visual Studio, using the guide http://llvm.org/docs/GettingStartedVS.html , but I'm getting errors:

Here is my view in CMake GUI, where I've directed it to use the C++ compiler C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/cl.exe .

I've already created a new directory called llvm for the build, since I cannot build in the source directory.

What am I doing wrong?

The configure process displays the following output:

The C compiler identification is unknown
The CXX compiler identification is unknown
The ASM compiler identification is MSVC
Found assembler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/cl.exe
CMake Error at CMakeLists.txt:48 (project):
  No CMAKE_C_COMPILER could be found.



Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/cl.exe
CMake Error: Generator: execution of make failed. Make command was: "MSBuild.exe" "cmTC_c88f4.vcxproj" "/p:Configuration=Debug" "/p:VisualStudioVersion=15.0"
Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/cl.exe -- broken
CMake Error at C:/Program Files/CMake/share/cmake-3.7/Modules/CMakeTestCXXCompiler.cmake:44 (message):
  The C++ compiler "C:/Program Files (x86)/Microsoft Visual Studio
  14.0/VC/bin/cl.exe" is not able to compile a simple test program.

  It fails with the following output:

   Change Dir: C:/dev/llvm/CMakeFiles/CMakeTmp



  Run Build Command:"MSBuild.exe" "cmTC_c88f4.vcxproj"
  "/p:Configuration=Debug" "/p:VisualStudioVersion=15.0"



  Generator: execution of make failed.  Make command was: "MSBuild.exe"
  "cmTC_c88f4.vcxproj" "/p:Configuration=Debug" "/p:VisualStudioVersion=15.0"





  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:48 (project)


Configuring incomplete, errors occurred!
See also "C:/dev/llvm/CMakeFiles/CMakeOutput.log".
See also "C:/dev/llvm/CMakeFiles/CMakeError.log".

Answer 1

I am working with your same setup(exception being Windows 32-bit), the LLVM version I have chosen is 4.0.0. I followed the tutorial for setting it up with clang.

I made notes for my entire process. Instructions for building LLVM 4.0.0 from source:

• Create a folder named LLVM in any suitable location.
• cd LLVM
• svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm
• cd llvm\\tools
• svn co http://llvm.org/svn/llvm-project/cfe/trunk clang
• cd .... # going back to where you started
• mkdir build
• cd build
• cmake -G "Visual Studio 14" ..\\llvm ##depends on the version of VS you use, I used VS 2015 -> VISUAL STUDIO 14.0
• If successful, in the build directory you will find LLVM.sln file which can be opened in Visual Studio, once opened, you can navigate through the solution explorer and right click the ALL_BUILD project -> Build.

Notes:

• I'm using Visual Studio 2015 (Update 3)
• I'm using Windows 10 32-bit system
• Header files dependencies can be fixed by appending paths to the files where it can be found in the Visual Studio 14.0 folder in Program Files.

• My environment variables for reference:

  **INCLUDE=C:\\Program Files\\Microsoft Visual Studio 14.0\\VC\\INCLUDE;C:\\Program Files\\Microsoft Visual Studio 14.0\\VC\\ATLMFC\\INCLUDE;C:\\Program Files\\Windows Kits\\10\\include\\10.0.10240.0\\ucrt;C:\\Program Files\\Windows Kits\\NETFXSDK\\4.6.1\\include\\um;C:\\Program Files\\Windows Kits\\8.1\\include\\shared;C:\\Program Files\\Windows Kits\\8.1\\include\\um;C:\\Program Files\\Windows Kits\\8.1\\include\\winrt;

  **LIBPATH=C:\\Windows\\Microsoft.NET\\Framework\\v4.0.30319;C:\\Program Files\\Microsoft Visual Studio 14.0\\VC\\LIB;C:\\Program Files\\Microsoft Visual Studio 14.0\\VC\\ATLMFC\\LIB;C:\\Program Files\\Windows Kits\\8.1\\References\\CommonConfiguration\\Neutral;\\Microsoft.VCLibs\\14.0\\References\\CommonConfiguration\\neutral;

• Set the PATH enviroment variable for llvm tools like clang, llc, lli, etc., if they're not recognized on developer command prompt.

• You may also find executables like clang and clang++ missing from the build when downloading from the github. I copied these from the prebuilt binaries which I had downloaded for windows which can be found on the LLVM releases page.

Hope this helps!