title: target_link_libraries and add_dependencies
body: <p>Is there any use case in which</p>
  
  <pre><code>target_link_libraries(my-lib x y z)
  
  add_dependencies(my-lib x) # this is not just a waste of bytes?
  </code></pre>
  
  <p>If so, can someone explain what it would be?</p>