GCC to LLVM migration tips?

Xcode 4 comes with LLVM. As a casual programmer (i.e. download some open source projects and compile them on a mac via command line), is there any ti开发者_如何学Cps for the transition?

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Compile something and see what doesn't work.

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As a casual programmer, I've found that "it just works".

If there are esoteric places where it breaks, you are not very likely to run across them.