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

    \$<CXX_COMPILER_VERSION>

  \$<CXX_COMPILER_VERSION> 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:[0-9]+ \(include\)
