/cmake-bug-toolchain-prefix

Primary LanguageCMake

CMake & PREFIX variable in toolchain file

Problem

If PREFIX variable is defined in file specified as CMAKE_TOOLCHAIN_FILE CMake is unable to recognize compiler version (CMAKE_CXX_COMPILER_VERSION is empty).

Steps to reproduce

  1. Make sure g++ is available in PATH
  2. Create directory build-a and run: cmake -Wno-dev -G Ninja -S <this repository> -B build-a -DCMAKE_TOOLCHAIN_FILE=toolchain-a.cmake (or any Makefiles generator)
    • CMake output will include Compiler version found! message
  3. Create directory build-b and run: cmake -Wno-dev -G Ninja -S <this repository> -B build-b -DCMAKE_TOOLCHAIN_FILE=toolchain-b.cmake (or any Makefiles generator)
    • CMake output will include Compiler version NOT found! message
  4. Remove -Wno-dev from commandline from point 3.
    • A lot of warnings will be reported, related to CMP0053
    • Visible snippets will indicate that PREFIX variable set in toolchain file was used as part of names of #defines in compiler detection code.