CMake Error at NotObjlibTarget.cmake:[0-9]+ \(file\):
  Error evaluating generator expression:

    \$<TARGET_OBJECTS:IFaceLib>

  Objects of target "IFaceLib" referenced but is not one of the allowed
  target types \(EXECUTABLE, STATIC, SHARED, MODULE, OBJECT\).
Call Stack \(most recent call first\):
  CMakeLists.txt:[0-9]+ \(include\)