You will need clang 3.3 to use the most relevant feature set from C++ 11. Read C++ Support in Clang for the complete list of up-to-date supported features. Clang 3.3 is claimed to be C++11 feature complete.
Clang's command line is gcc-compatible so you have to enable C++11 support via the followinf command-line switch
-std=c++11
There is also a bunch of post-C++11 features (like decltype(auto), member initializers and aggregates) that are supported by Clang 3.3. Use this command line switch to enable them
-std=c++1y
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