CMake Error in CMakeLists\.txt:
  Target "not-cxx-source" contains the source

    .*/Tests/RunCMake/CXXModules/sources/c-anchor\.c

  in a file set of type "CXX_MODULES" but the source is not classified as a
  "CXX" source\.


CMake Generate step failed\.  Build files cannot be regenerated correctly\.
