CMake Error at BadTargetTypeObject.cmake:2 \(add_custom_target\):
  Error evaluating generator expression:

    \$<TARGET_FILE:objlib>

  Target "objlib" is not an executable or library.
Call Stack \(most recent call first\):
  CMakeLists.txt:3 \(include\)
+
CMake Error at BadTargetTypeObject.cmake:2 \(add_custom_target\):
  Error evaluating generator expression:

    \$<TARGET_SONAME_FILE:objlib>

  Target "objlib" is not an executable or library.
Call Stack \(most recent call first\):
  CMakeLists.txt:3 \(include\)
+
CMake Error at BadTargetTypeObject.cmake:2 \(add_custom_target\):
  Error evaluating generator expression:

    \$<TARGET_LINKER_FILE:objlib>

  Target "objlib" is not an executable or library.
Call Stack \(most recent call first\):
  CMakeLists.txt:3 \(include\)