title: Can I upgrade Xcode to support a newer version of GCC to learn C++0x?
body: <p>I would like to jump in learn C++0x, which has matured to a level I'm happy with.</p>
  
  <p>Xcode on Snow Leopard 10.6 is currently at GCC 4.2.1, and the new features I'd like to try, like std::shared_ptr, lambdas, auto, null pointer constant, unicode string literals, and other bits and pieces, require at least 4.3 (I believe).</p>
  
  <p>Ideally I'd use Xcode but I'm not even sure if you can manually upgrade the compiler for Xcode.  Is this possible?</p>
  
  <p>Otherwise, what is the best way to install a different version of GCC that doesn't interfere with the rest of the system?</p>