title: Suppressing: "#warning is language extension"
body: <p>In an <a href="/questions/tagged/xcode4.5" class="post-tag" title="show questions tagged &#39;xcode4.5&#39;" rel="tag">xcode4.5</a> project I have turned on <code>pedantic</code> warnings. But this now gives me a warning about using <code>#warning</code>:</p>
  
  <blockquote>
    <p>Lexical preprocessor issue<br>
        #warning is language extension</p>
  </blockquote>
  
  <p>Firstly, I'd like to know why this is happening and how to stop it (with out removing the #warning). </p>