title: Is clang's libc++ production ready?
body: <p>Has anyone got a positive experience using clang's <code>libc++</code> in production? 
  Status chart at <a href="http://libcxx.llvm.org/libcxx_by_chapter.pdf" rel="noreferrer">http://libcxx.llvm.org/libcxx_by_chapter.pdf</a> doesn't look very good to me.</p>