title: Xcode Compile Flag to Suppress Nullability Warnings not Working?
body: <p>For a limited time I want to suppress these kind of warnings the compiler is showing me in Xcode 7.3.1:</p>
  
  <p><code>&lt;File&gt;: Pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified)</code></p>
  
  <p>I have added this compiler flag to all classes under My Target/Build Phases/Compile Sources:
  <code>-Wnullability-completeness</code></p>
  
  <p>But it's not working - the warnings are still shown. How can I get rid of the warnings?</p>