CMAKE_TOOLCHAIN_FILE was not used by the project

Question

Cmake gives this warning when building one third-party script:

CMake Warning:
  Manually-specified variables were not used by the project:

    CMAKE_TOOLCHA         


        

Answer 1

In case you get this message with CLion after you set the -DCMAKE_TOOLCHAIN_FILE=xxx option, you'll want to delete all the CMake build directories.

Do

Tools-> CMake -> Show Generated CMake Files in File Manager

then delete all build directories. Then do

Tools-> CMake -> Reload the CMake Project

Once you do this, you will still get the warning, but at least it will be observed the first time cmake is run.