Is the VCPKG_CHAINLOAD_TOOLCHAIN_FILE not being passed during the compilation of packages?

[aphage]

During compilation, I specified VCPKG_CHAINLOAD_TOOLCHAIN_FILE and configured the correct build tools in toolchain.cmake. However, vcpkg failed when compiling the third-party package SQLite3, as VCPKG_CHAINLOAD_TOOLCHAIN_FILE appears not to have been passed.

It only worked correctly after I set VCPKG_CHAINLOAD_TOOLCHAIN_FILE in the custom triplet. Is this the expected behavior?

$ cmake -B build --preset linux-debug -DVCPKG_CHAINLOAD_TOOLCHAIN_FILE=toolchain.cmake
Preset CMake variables:

  CMAKE_BUILD_TYPE="Debug"
  CMAKE_INSTALL_PREFIX:PATH="/home/foo/dot11-formatter/out/install/linux-debug"
  CMAKE_TOOLCHAIN_FILE:FILEPATH="~/vcpkg/scripts/buildsystems/vcpkg.cmake"
  VCPKG_OVERLAY_TRIPLETS="/home/foo/dot11-formatter/triplets"
  VCPKG_TARGET_TRIPLET="arm-linux-static"

-- CMAKE_SYSROOT: /opt/gcc-arm-10.3-2021.07-x86_64-arm-none-linux-gnueabihf/arm-none-linux-gnueabihf/libc
-- CMAKE_C_COMPILER: clang
-- CMAKE_CXX_COMPILER: clang++
-- CMAKE_ASM_COMPILER: clang
-- CMAKE_EXE_LINKER_FLAGS: -fuse-ld=lld
-- CMAKE_C_COMPILER_TARGET: arm-none-linux-gnueabihf
-- CMAKE_CXX_COMPILER_TARGET: arm-none-linux-gnueabihf
-- Running vcpkg install
Detecting compiler hash for triplet x64-linux...
Compiler found: /usr/bin/c++
Detecting compiler hash for triplet arm-linux-static...
error: while detecting compiler information:
The log file content at "/home/foo/vcpkg/buildtrees/detect_compiler/stdout-arm-linux-static.log" is:
-- Configuring arm-linux-static-rel
CMake Error at scripts/cmake/vcpkg_execute_required_process.cmake:127 (message):
    Command failed: /home/foo/vcpkg/downloads/tools/cmake-3.30.1-linux/cmake-3.30.1-linux-x86_64/bin/cmake /home/foo/vcpkg/scripts/detect_compiler -G Ninja -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/home/foo/vcpkg/packages/detect_compiler_arm-linux-static -DVCPKG_COMPILER_CACHE_FILE=/home/foo/dot11-formatter/build/vcpkg_installed/vcpkg/compiler-file-hash-cache.json -DCMAKE_MAKE_PROGRAM=/home/foo/vcpkg/downloads/tools/ninja/1.12.1-linux/ninja -DCMAKE_SYSTEM_NAME=Linux -DBUILD_SHARED_LIBS=OFF -DVCPKG_CHAINLOAD_TOOLCHAIN_FILE=/home/foo/vcpkg/scripts/toolchains/linux.cmake -DVCPKG_TARGET_TRIPLET=arm-linux-static -DVCPKG_SET_CHARSET_FLAG=ON -DVCPKG_PLATFORM_TOOLSET=external -DCMAKE_EXPORT_NO_PACKAGE_REGISTRY=ON -DCMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY=ON -DCMAKE_FIND_PACKAGE_NO_SYSTEM_PACKAGE_REGISTRY=ON -DCMAKE_INSTALL_SYSTEM_RUNTIME_LIBS_SKIP=TRUE -DCMAKE_VERBOSE_MAKEFILE=ON -DVCPKG_APPLOCAL_DEPS=OFF -DCMAKE_TOOLCHAIN_FILE=/home/foo/vcpkg/scripts/buildsystems/vcpkg.cmake -DCMAKE_ERROR_ON_ABSOLUTE_INSTALL_DESTINATION=ON -DVCPKG_CXX_FLAGS= -DVCPKG_CXX_FLAGS_RELEASE= -DVCPKG_CXX_FLAGS_DEBUG= -DVCPKG_C_FLAGS= -DVCPKG_C_FLAGS_RELEASE= -DVCPKG_C_FLAGS_DEBUG= -DVCPKG_CRT_LINKAGE=dynamic -DVCPKG_LINKER_FLAGS= -DVCPKG_LINKER_FLAGS_RELEASE= -DVCPKG_LINKER_FLAGS_DEBUG= -DVCPKG_TARGET_ARCHITECTURE=arm -DCMAKE_INSTALL_LIBDIR:STRING=lib -DCMAKE_INSTALL_BINDIR:STRING=bin -D_VCPKG_ROOT_DIR=/home/foo/vcpkg -DZ_VCPKG_ROOT_DIR=/home/foo/vcpkg -D_VCPKG_INSTALLED_DIR=/home/foo/dot11-formatter/build/vcpkg_installed -DVCPKG_MANIFEST_INSTALL=OFF
    Working Directory: /home/foo/vcpkg/buildtrees/detect_compiler/arm-linux-static-rel
    Error code: 1
    See logs for more information:
      /home/foo/vcpkg/buildtrees/detect_compiler/config-arm-linux-static-rel-CMakeCache.txt.log
      /home/foo/vcpkg/buildtrees/detect_compiler/config-arm-linux-static-rel-out.log
      /home/foo/vcpkg/buildtrees/detect_compiler/config-arm-linux-static-rel-err.log

Call Stack (most recent call first):
  scripts/cmake/vcpkg_configure_cmake.cmake:344 (vcpkg_execute_required_process)
  scripts/detect_compiler/portfile.cmake:18 (vcpkg_configure_cmake)
  scripts/ports.cmake:206 (include)


error: vcpkg was unable to detect the active compiler's information. See above for the CMake failure output.
-- Running vcpkg install - failed
CMake Error at /home/foo/vcpkg/scripts/buildsystems/vcpkg.cmake:938 (message):
  vcpkg install failed.  See logs for more information:
  /home/foo/dot11-formatter/build/vcpkg-manifest-install.log
Call Stack (most recent call first):
  build/CMakeFiles/3.28.3/CMakeSystem.cmake:6 (include)
  CMakeLists.txt:3 (project)


-- Configuring incomplete, errors occurred!

[Osyotr]

You need to set this variable in the triplet, too.

[aphage]

If you need to set VCPKG_CHAINLOAD_TOOLCHAIN_FILE in a custom triplet, the external VCPKG_CHAINLOAD_TOOLCHAIN_FILE should not be set. Otherwise, conflicting configurations may occur if they are specified differently.

[aphage]

Right？

[Osyotr]

Having separate toolchains for vcpkg and main project is sometimes desirable.