CMake Error at NonValidTarget-CXX_COMPILER_ID.cmake:1 \(add_custom_command\):
  Error evaluating generator expression:

    \$<CXX_COMPILER_ID>

  \$<CXX_COMPILER_ID> may only be used with binary targets.  It may not be
  used with add_custom_command or add_custom_target.
Call Stack \(most recent call first\):
  CMakeLists.txt:3 \(include\)