Can I use C++11 with Xcode?

Xcode 4.2 had finally added support for C++0X:

1. In the project build settings screen, switch on "All" options.

2. In the "Build Options" section, set compiler to "Apple LLVM compiler 3.0".

3. Scroll down to "Apple LLVM Compiler 3.0 - Language" section and set "C++ Language Dialect" to "C++0X" and "C++ Standard Library" to "libc++".

The std::move(), move constructor and R-Value reference are known to work as expected, and I'm testing on the std::thread and std::atomic.

======= Update 2012: =======

Start with Clang - Many C++11 features are now available in Clang. It's included with Xcode.

======= Original answer from Jan 2011: =======

intel's compiler may be the cleanest way to go at this time.http://software.intel.com/en-us/articles/intel-composer-xe/

clang's promising, but not particularly stable or featured wrt c++0x features. c++ is still very new for clang.

gcc: relatively mature, but you'll have to write and maintain your compiler plugins for xcode.

you can also specify custom scripts, but that is a pain to maintain... unless you go all out and create an adaptor tool.

Xcode uses the GCC or the Clang C++ compilers. Any features supported by those compilers are fair game. GCC's C++ compatibility page is here and the Clang C++ compatibility page is here.