I have two VS installations: 1. BuildTools-only install with MSVC and Intel C++ compilers 2. Community Edition with MSVC and GPGPU extensions installed (I needed this install because neither Intel oneAPI, nor AMD HIP SDK install PlatformToolset for BuildTools installations of VS) I am trying to use these GPGPU extensions alongside CMake (for eg. `cmake -G "Visual Studio 172022" -T HIP_clang -D CMAKE_GENERATOR_INSTANCE="C:\Kellekek\Microsoft\VisualStudio\2022\Community" -D CMAKE_MSVC_DEBUG_INFORMATION_FORMAT="" ...`). This mostly gets the job done, but as soon as I try to use `FetchContent`, it fails inside the subbuild during download. A very simple project file such as: ```cmake cmake_minimum_required(VERSION 3.18) cmake_policy(VERSION 3.18...3.25) project(CMakeBug2 LANGUAGES CXX) include(FetchContent) FetchContent_Declare( googletest GIT_REPOSITORY https://github.com/google/googletest.git GIT_TAG e2239ee6043f73722e7aa812a459f54a28552929 # release-1.11.0) FetchContent_MakeAvailable(googletest) add_executable(${PROJECT_NAME} Main.cpp) target_link_libraries(${PROJECT_NAME} PRIVATE gtest) ``` Breaks with the following message: ``` -- The CXX compiler identification is Clang 16.0.0 with MSVC-like command-line -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Check for working CXX compiler: C:/Kellekek/Microsoft/VisualStudio/2022/Community/VC/Tools/MSVC/14.34.31933/bin/Hostx64/x64/cl.exe - skipped -- Detecting CXX compile features -- Detecting CXX compile features - done CMake Error at CMakeLists.txt:10 (project): Failed to run MSBuild command: C:/Kellekek/Microsoft/VisualStudio/2022/BuildTools/MSBuild/Current/Bin/amd64/MSBuild.exe to get the value of VCTargetsPath: MSBuild version 17.4.1+9a89d02ff for .NET Framework Build started 2023. 02. 09. 17:15:28. Project "C:\Users\mate\Source\CMakeBug2\.vscode\build\msbuild-clang-rocm\_deps\googletest-subbuild\CMakeFiles\3.25.1\VCTargetsPath.vcxproj" on node 1 (default targets). C:\Kellekek\Microsoft\VisualStudio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppBuild.targets(442,5): error MSB8020: The build tools for HIP_clang (Platform Toolset = 'HIP_clang') cannot be found. To build using the HIP_clang build tools, please install HIP_clang 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:\Users\mate\Source\CMakeBug2\.vscode\build\msbuild-clang-rocm\_deps\googletest-subbuild\CMakeFiles\3.25.1\VCTargetsPath.vcxproj] Done Building Project "C:\Users\mate\Source\CMakeBug2\.vscode\build\msbuild-clang-rocm\_deps\googletest-subbuild\CMakeFiles\3.25.1\VCTargetsPath.vcxproj" (default targets) -- FAILED. Build FAILED. "C:\Users\mate\Source\CMakeBug2\.vscode\build\msbuild-clang-rocm\_deps\googletest-subbuild\CMakeFiles\3.25.1\VCTargetsPath.vcxproj" (default target) (1) -> (PrepareForBuild target) -> C:\Kellekek\Microsoft\VisualStudio\2022\BuildTools\MSBuild\Microsoft\VC\v170\Microsoft.CppBuild.targets(442,5): error MSB8020: The build tools for HIP_clang (Platform Toolset = 'HIP_clang') cannot be found. To build using the HIP_clang build tools, please install HIP_clang 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:\Users\mate\Source\CMakeBug2\.vscode\build\msbuild-clang-rocm\_deps\googletest-subbuild\CMakeFiles\3.25.1\VCTargetsPath.vcxproj] 0 Warning(s) 1 Error(s) Time Elapsed 00:00:00.16 Exit code: 1 -- Configuring incomplete, errors occurred! See also "C:/Users/mate/Source/CMakeBug2/.vscode/build/msbuild-clang-rocm/_deps/googletest-subbuild/CMakeFiles/CMakeOutput.log". CMake Error at C:/Kellekek/Kitware/CMake/3.25.1/share/cmake-3.25/Modules/FetchContent.cmake:1604 (message): CMake step for googletest failed: 1 Call Stack (most recent call first): C:/Kellekek/Kitware/CMake/3.25.1/share/cmake-3.25/Modules/FetchContent.cmake:1756:EVAL:2 (__FetchContent_directPopulate) C:/Kellekek/Kitware/CMake/3.25.1/share/cmake-3.25/Modules/FetchContent.cmake:1756 (cmake_language) C:/Kellekek/Kitware/CMake/3.25.1/share/cmake-3.25/Modules/FetchContent.cmake:1970 (FetchContent_Populate) CMakeLists.txt:18 (FetchContent_MakeAvailable) -- Configuring incomplete, errors occurred! See also "C:/Users/mate/Source/CMakeBug2/.vscode/build/msbuild-clang-rocm/CMakeFiles/CMakeOutput.log". ``` Notice how `CMAKE_GENERATOR_INSTANCE` is set to `C:\Kellekek\Microsoft\VisualStudio\2022\Community` and that's where the compiler gets picked up when the `project()` command is encountered, but when it's trying to download Google Test, it's using MSBuild from `C:/Kellekek/Microsoft/VisualStudio/2022/BuildTools`, but that VS instance doesn't have this toolset installed. The trace gives a hint at where things go south. I added ``` if(CMAKE_GENERATOR_INSTANCE) list(APPEND subCMakeOpts "-DCMAKE_GENERATOR_INSTANCE:STRING=${CMAKE_GENERATOR_INSTANCE}") endif() ``` to `FetchContent.cmake` and that seems to solve this issue of the wrong instance being picked in FetchContent.