title: How to enable ARC for a file in Non-ARC project?
body: <p>I know you can use <code>-fno-objc-arc</code> flag to disable ARC for files that NOT support ARC in an ARC project.</p>
  
  <p>Is there any way to enable ARC for files support ARC in a Non-ARC project?</p>
  
  <p>Thanks!</p>