title: What is defined in Mac OS GCC for C?
body: <p>So I wonder where to get the list of default Mac OS GCC defines for pure C? Can any one post list here?</p>
  
  <p>Why I need such thing:</p>
  
  <p>I do not have mac OS X, I try to compile ffmpeg with alchemy GCC under ubuntu, and ffmpeg wonders which os it is. And gives me wornings like </p>
  
  <pre><code>                from libavformat/os_support.c:28:
  /home/rupert/Desktop/arch/alchemy-ubuntu-v0.5a/avm2-libc/include/machine/_types.h:95:5: warning: "OSX" is not defined
  </code></pre>