CMake does not find LLVM toolchain

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tgq

01 Oct, 2020 03:21 PM

Hello. I've read that clang is integrated into Visual Studio image, but it doesn't want to cooperate with cmake.
My build script calls a line:
cmake .. -DCMAKE_TOOLCHAIN_FILE=c:/tools/vcpkg/scripts/buildsystems/vcpkg.cmake -TLLVM which ends with error

-- Building for: Visual Studio 16 2019
CMake Error at CMakeLists.txt:3 (project):
  Failed to run MSBuild command:
    C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/MSBuild/Current/Bin/MSBuild.exe
  to get the value of VCTargetsPath:
    Microsoft (R) Build Engine version 16.7.0+b89cb5fde for .NET Framework
    Copyright (C) Microsoft Corporation. All rights reserved.

Build started 10/1/2020 3:15:02 PM.
Project "C:\projects\appveyor-playground\build\CMakeFiles\3.18.3\VCTargetsPath.vcxproj" on node 1 (default targets).
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Microsoft\VC\v160\Microsoft.CppBuild.targets(411,5): error MSB8020: The build tools for LLVM (Platform Toolset = 'LLVM') cannot be found. To build using the LLVM build tools, please install LLVM build tools.  Alternatively, you may upgrade to the current Visual Studio tools by selecting the Project menu or right-click the solution, and then selecting "Retarget solution". [C:\projects\appveyor-playground\build\CMakeFiles\3.18.3\VCTargetsPath.vcxproj]
Done Building Project &quot;C:\projects\appveyor-playground\build\CMakeFiles\3.18.3\VCTargetsPath.vcxproj&quot; (default targets) -- FAILED.</code>



I've also tried llvm and LLVM_v142, neither works. What is the exact toolchain name to pass to cmake invocation?

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