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

    \$<C_COMPILER_ID>

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