That site should clarify that they are talking about the open source Clang 3.1 and not Apple Clang 3.1. Apple is unfortunately using the same version numbering

That site should clarify that they are talking about the open source Clang 3.1 and not Apple Clang 3.1. Apple is unfortunately using the same version numbering as the open source clang yet their compiler is significantly less featured. It's ironic that Apple started clang, yet their clang is the most out of date.