The default compiler in Xcode 4 is LLVM GCC 4.2 while the default compiler in Xcode 3 is GCC 4.2. Why the difference? LLVM is supposedly faster than GCC and LLVM GCC has the benefits of LLVM and still compatible with GCC. See more at this great article:
http://useyourloaf.com/blog/2011/3/21/compiler-options-in-xcode-gcc-or-llvm.html
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