title: Passing compiler flags through xcodebuild
body: <p>I'm currently using <code>xcodebuild</code> to automate testing for iOS.</p>
  
  <p>Right now, I'm stuck on trying to pass compiler flags through Xcode directly to the compiler. These flags are: <code>-fprofile-arcs -ftest-coverage</code>.</p>
  
  <p>I don't have the liberty of modifying the xcodeproj, that's why I want to inject these flags via the xcodebuild command.</p>
  
  <p>It would be something like:</p>
  
  <pre><code>xcodebuild -project path/to/my.xcodeproj -scheme MyApp -fprofile-arcs -ftest-coverage
  </code></pre>
  
  <p>Is that feasible? How?</p>