title: Add a custom compiler to XCode 3.2
body: <p>I have a working gcc 4.3.3 toolchain for an ARM Cortex-m3 and would like to integrate it into XCode.</p>
  
  <p>Is there a way to set up XCode (3.2) to use this gcc toolchain instead of the built-in GCC 4.2?</p>
  
  <p>What I've tried so far:
  I've added a modified copy of the <code>GCC 4.2.xcplugin</code> and changed the name, version and executable path. It shows up in XCode but whenever I set the "C/C++ Compiler Version" to the custom compiler it fails with </p>
  
  <blockquote>
    <p>Invalid value '4.3.3' for GCC_VERSION</p>
  </blockquote>
  
  <p>It seems like the valid version numbers are hardcoded somewhere else because even when I remove the original <code>GCC 4.2.xcplugin</code>, the value <code>4.2</code> remains valid (but is not visible in the "C/C++ Compiler Version" drop down anymore).</p>