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

    \$<TARGET_PROPERTY:NotAProperty>

  \$<TARGET_PROPERTY:prop> may only be used with binary targets\.  It may not
  be used with add_custom_command or add_custom_target\.  Specify the target
  to read a property from using the \$<TARGET_PROPERTY:tgt,prop> signature
  instead\.
Call Stack \(most recent call first\):
  CMakeLists\.txt:[0-9]+ \(include\)
