title: xcode: How to specify clang version using GCC_VERSION field?
body: <p>I'm running Xcode4.5. Our project started with older Xcode and specifies compiler version using a meta-file that says</p>
  
  <pre><code>GCC_VERSION = com.apple.compilers.llvm.clang.1_0
  </code></pre>
  
  <p>As far as I know this points to older version of LLVM and I wonder where I can find the canonical version number that specifies the latest LLVM (4.1) with Xcode4.5?</p>
  
  <p>Thanks!</p>