microsoft
Doesn't work with clang on windows
Brief Issue Summary
I have installed Clang Compiler and Clang-cl via Visual Studio Intaller. VSCode detects [Clang 12.0.0 (MSVC CLI) for MSVC 16.11.31613.86 (Visual Studio Community 2019 Release - amd64)] kit. I use conan package manager and have Eigen package installed (example project Morpho.zip). Build fails in VSCode but Visual Studio can build this project successfully.
CMake Tools Log
Cmake tools log:
[main] Building folder: Morpho
[main] Configuring folder: Morpho
[proc] Executing command: "C:\Program Files\CMake\bin\cmake.EXE" --no-warn-unused-cli -DCMAKE_EXPORT_COMPILE_COMMANDS:BOOL=TRUE -DCMAKE_BUILD_TYPE:STRING=Debug "-DCMAKE_C_COMPILER:FILEPATH=C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\Llvm\x64\bin\clang-cl.exe" "-DCMAKE_CXX_COMPILER:FILEPATH=C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\Llvm\x64\bin\clang-cl.exe" -Hd:/GIT/Morpho -Bd:/GIT/Morpho/build -G Ninja
[cmake] Not searching for unused variables given on the command line.
[cmake] -- The C compiler identification is Clang 12.0.0 with MSVC-like command-line
[cmake] -- The CXX compiler identification is Clang 12.0.0 with MSVC-like command-line
[cmake] -- Detecting C compiler ABI info
[cmake] -- Detecting C compiler ABI info - done
[cmake] -- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/Llvm/x64/bin/clang-cl.exe - skipped
[cmake] -- Detecting C compile features
[cmake] -- Detecting C compile features - done
[cmake] -- Detecting CXX compiler ABI info
[cmake] -- Detecting CXX compiler ABI info - done
[cmake] -- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/Llvm/x64/bin/clang-cl.exe - skipped
[cmake] -- Detecting CXX compile features
[cmake] -- Detecting CXX compile features - done
[cmake] -- Conan: Adjusting output directories
[cmake] -- Conan: Using cmake global configuration
[cmake] -- Conan: Adjusting default RPATHs Conan policies
[cmake] -- Conan: Adjusting language standard
[cmake] -- Current conanbuildinfo.cmake directory: D:/GIT/Morpho/build
[cmake] CMake Error at build/conanbuildinfo.cmake:680 (message):
[cmake] Incorrect 'Visual Studio'. Toolset specifies compiler as 'MSVC' but CMake
[cmake] detected 'Clang'
[cmake] Call Stack (most recent call first):
[cmake] build/conanbuildinfo.cmake:251 (conan_check_compiler)
[cmake] Morpho/CMakeLists.txt:8 (conan_basic_setup)
[cmake]
[cmake]
[cmake] -- Configuring incomplete, errors occurred!
[cmake] See also "D:/GIT/Morpho/build/CMakeFiles/CMakeOutput.log".
[cmake] See also "D:/GIT/Morpho/build/CMakeFiles/CMakeError.log".
CMakeError.log:
Compiling the C compiler identification source file "CMakeCCompilerId.c" failed.
Compiler: C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/Llvm/x64/bin/clang-cl.exe
Build flags:
Id flags:
The output was:
1
clang-cl: error: unable to execute command: program not executable
clang-cl: 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:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/Llvm/x64/bin/clang-cl.exe
Build flags:
Id flags:
The output was:
1
clang-cl: error: unable to execute command: program not executable
clang-cl: error: linker command failed with exit code 1 (use -v to see invocation)
Platform and Versions
- Operating System: Windows 10
- CMake Version: 3.18.3
- VSCode Version: 1.59,1
- CMake Tools Extension Version: 1.8.0
- Compiler/Toolchain: clang-cl
It would appear to have something to do with the Conan rules. We'll need to try this out. clang-cl works for me in a non-Conan project.
[cmake] Incorrect 'Visual Studio'. Toolset specifies compiler as 'MSVC' but CMake [cmake] detected 'Clang'
This error very likely stems from the fact that the Conan profile you used with conan install specifies compiler=Visual Studio while you're invoking CMake with -DCMAKE_C_COMPILER and -DCMAKE_CXX_COMPILER pointing to Clang. The fix would be to either change your default Conan profile to specify Clang or to create a separate profile for Clang and specify that one instead of the default profile when you run conan install. See https://docs.conan.io/en/latest/reference/profiles.html.
