CMake Warning \(dev\) at NotCompiledSourceModules.cmake:5 \(target_sources\):
  CMake's C\+\+ module support is experimental.  It is meant only for
  experimentation and feedback to CMake developers.
Call Stack \(most recent call first\):
  CMakeLists.txt:6 \(include\)
This warning is for project developers.  Use -Wno-dev to suppress it.

(CMake Error in CMakeLists.txt:
  Target "not-cxx-source" has source file

    .*/Tests/RunCMake/CXXModules/sources/not-compiled.txt

  in a "FILE_SET TYPE CXX_MODULES" but it is not scheduled for compilation.

)+
CMake Generate step failed.  Build files cannot be regenerated correctly.