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STL is ambiguous. You mean standard library or stdlib if it must be shortened. Helpless pedantry I know but freenode's #c++ has beat this into me.

fair enough

As far as I know, libc++ is at the moment feature complete on OS X. Work still has to be done for other platforms.

You should be able to use LLVMs libc++ with GCC, just like you can currently use GNU libstdc++ with Clang.