title: How to update LLVM & Clang on Mac OSX?
body: <p>On my version of Mac OSX (Lion 10.7.1, XCode 4.1), there is LLVM 3.0svn and Clang 2.1.
  The <a href="http://clang.llvm.org/cxx_status.html" rel="noreferrer">current versions</a> are LLVM 3.0 and Clang 3.0.</p>
  
  <p>From the <a href="http://developer.apple.com/technologies/tools/whats-new.html#llvm-compiler" rel="noreferrer">XCode web site</a>, it seems that the latest version (4.2.1) still uses LLVM 2.0, and this seems to be a mistake.</p>
  
  <p>Do you know if installing the latest XCode I will get a more recent version of LLVM/Clang?</p>
  
  <p>Do you know of any possible issues <a href="http://clang.llvm.org/get_started.html" rel="noreferrer">installing Clang manually</a>?</p>
  
  <p>Once installed, will the new Clang be used automatically by all the IDEs I have (e.g. NetBeans)?</p>