title: Xcode 4.2 won't recognize C++ raw string literals?
body: <p>I'm trying to pick up the basics of C++11. I have Xcode 4.2 on my mac, which uses the LLVM 3.0 compiler. From what I read, it should have support for raw string literals (i.e. <code>R"(...)"</code>) but when I try to compile something with them, it barfs at me. I have set it up for c++0x (I turned on <code>-std=c++0x</code> and the libc++ library) and I know it works with other c++0x features like the range for-loop.</p>
  
  <p>Is there anything I'm missing here?</p>