Building c++ project on Windows with CMake, Clang and Ninja - c++

Question

I currently have cmake, clang and ninja installed on windows. I am trying to use CMake to generate a ninja build file to compile a very simple hello world program.
My CMakeLists.txt looks like this:
cmake_minimum_required(VERSION 2.8)
project(test_project)
add_executable(main main.cpp)
main.cpp is a simple hello world program.
On the command line I run this: cmake -G Ninja .. and I get the following errors:
-- The C compiler identification is Clang 3.5.0
clang.exe: error: no such file or directory: '/nologo'
clang.exe: error: no such file or directory: '/showIncludes'
-- The CXX compiler identification is Clang 3.5.0
clang.exe: error: no such file or directory: '/nologo'
clang.exe: error: no such file or directory: '/showIncludes'
-- Check for working C compiler using: Ninja
-- Check for working C compiler using: Ninja -- broken
CMake Error at C:/Program Files (x86)/CMake 2.8/share/cmake-2.8/Modules/CMakeTestCCompiler.cmake:61 (message):
The C compiler "C:/llvm_build/RelWithDebInfo/bin/clang.exe" is
not able to compile a simple test program.
It fails with the following output:
Change Dir: C:/test_proj/build/CMakeFiles/CMakeTmp
Run Build Command:C:/ninja/ninja.exe cmTryCompileExec375034429
[1/2] Building C object
CMakeFiles\cmTryCompileExec375034429.dir\testCCompiler.c.obj
[2/2] Linking C executable cmTryCompileExec375034429.exe
FAILED: cmd.exe /c cd . &&
C:\llvm_build\RelWithDebInfo\bin\clang.exe
CMakeFiles\cmTryCompileExec375034429.dir\testCCompiler.c.obj -o
cmTryCompileExec375034429.exe && cd .
clang.exe: error: unable to execute command: program not executable
clang.exe: error: linker command failed with exit code 1 (use -v to see
invocation)
ninja: build stopped: subcommand failed.
CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
CMakeLists.txt:2 (project)
-- Configuring incomplete, errors occurred!
See also "C:/test_proj/build/CMakeFiles/CMakeOutput.log".
See also "C:/test_proj/build/CMakeFiles/CMakeError.log".
The CMakeError.log file looks like this:
Compiling the C compiler identification source file "CMakeCCompilerId.c" failed.
Compiler: C:/llvm_build/RelWithDebInfo/bin/clang.exe
Build flags:
Id flags:
The output was:
1
clang.exe: error: unable to execute command: program not executable
clang.exe: error: linker command failed with exit code 1 (use -v to see invocation)
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: C:/llvm_build/RelWithDebInfo/bin/clang++.exe
Build flags:
Id flags:
The output was:
1
clang++.exe: error: unable to execute command: program not executable
clang++.exe: error: linker command failed with exit code 1 (use -v to see invocation)
Determining if the C compiler works failed with the following output:
Change Dir: C:/test_proj/build/CMakeFiles/CMakeTmp
Run Build Command:C:/ninja/ninja.exe cmTryCompileExec2120850158
[1/2] Building C object CMakeFiles\cmTryCompileExec2120850158.dir\testCCompiler.c.obj
[2/2] Linking C executable cmTryCompileExec2120850158.exe
FAILED: cmd.exe /c cd . && C:\llvm_build\RelWithDebInfo\bin\clang.exe CMakeFiles\cmTryCompileExec2120850158.dir\testCCompiler.c.obj -o cmTryCompileExec2120850158.exe && cd .
clang.exe: error: unable to execute command: program not executable
clang.exe: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.
It appears that cmake is trying to test clang with windows options /nologo and /showIncludes. I cannot figure out how to tell cmake to pass the proper arguments.
FWIW I'm running 64bit Windows 7
EDIT:
So I looked through the built in cmake files and I found that the CMakeClDeps.cmake file was the culprit for adding the /nologo /showIncludes options. It appears that if I set Clang as the compiler then cmake thinks that visual studio is the compiler (it sets MSVC_C_ARCHITECTURE_ID to x86).
I removed the line in CMakeDetermineCompilerId.cmake that sets MSVC_C_ARCHITECTURE_ID and after trying again I get the following errors:
-- The C compiler identification is Clang 3.5.0
-- The CXX compiler identification is Clang 3.5.0
-- Check for working C compiler using: Ninja
-- Check for working C compiler using: Ninja -- broken
CMake Error at C:/Program Files (x86)/CMake 2.8/share/cmake-2.8/Modules/CMakeTestCCompiler.cmake:61 (message):
The C compiler "C:/llvm_build/RelWithDebInfo/bin/clang.exe" is
not able to compile a simple test program.
It fails with the following output:
Change Dir: C:/test_proj/build/CMakeFiles/CMakeTmp
Run Build Command:C:/ninja/ninja.exe cmTryCompileExec2815594422
[1/2] Building C object
CMakeFiles\cmTryCompileExec2815594422.dir\testCCompiler.c.obj
[2/2] Linking C executable cmTryCompileExec2815594422.exe
FAILED: cmd.exe /c cd . &&
C:\llvm_build\RelWithDebInfo\bin\clang.exe
CMakeFiles\cmTryCompileExec2815594422.dir\testCCompiler.c.obj -o
cmTryCompileExec2815594422.exe && cd .
clang.exe: error: unable to execute command: program not executable
clang.exe: error: linker command failed with exit code 1 (use -v to see
invocation)
ninja: build stopped: subcommand failed.
CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
CMakeLists.txt:2 (project)
-- Configuring incomplete, errors occurred!
See also "C:/test_proj/build/CMakeFiles/CMakeOutput.log".
See also "C:/test_proj/build/CMakeFiles/CMakeError.log".

Answer 1

Don't know if it can be helpful but I had the same error. Now I can compile with clang(3.7.1)/ninja(1.6)/cmake(3.4.1) on Windows performing the following actions in a build directory:
load the relevant vcvarsXX.bat file (e.g. "<Your Visual Studio location>\VC\vcvarsall.bat" x86)
set both CC and CXX to clang-cl (instead of clang and clang++)
run cmake -G Ninja <project>
run cmake --build .

Answer 2

Turns out the second set of errors I received were because clang could not find the linker. I had built clang using visual studio but at the time it couldn't find the visual studio linker. All I had to do was run it in the visual studio development console.
CMake still thinks that clang is a visual studio compiler so in the CMakeDetermineCompilerId.cmake file there is a line that looks like this:
set(MSVC_${lang}_ARCHITECTURE_ID "${ARCHITECTURE_ID}")
and I changed it to look like this
if (COMPILER_ID MATCHES "MSVC")
set(MSVC_${lang}_ARCHITECTURE_ID "${ARCHITECTURE_ID}")
endif()
Hopefully this doesn't break any other CMake functionality.