用的是官方pdsk     Payload_SDK_V2.2.1-build.315\sample\platform\linux\manifold2\project
cmake  一直会报下面的错误
CMake Error at CMakeLists.txt:56 (target_link_libraries):
  Target "test_demo" of type EXECUTABLE may not be linked into another
  target.  One may link only to STATIC or SHARED libraries, or to executables
  with the ENABLE_EXPORTS property set.


Cmskelists.txt  这样写的   
project(test_demo)
## Outputs
add_executable(${CMAKE_PROJECT_NAME} test_demo
         ${APP_SRC}
        ${COMMON_SRC}
         ${SAMPLE_SRC}      
)
target_link_libraries(${CMAKE_PROJECT_NAME} test_demo)
请问最后这里应该怎么修改？