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Or, just use LLVM's link time optimization:

http://llvm.org/docs/LinkTimeOptimization.html

GCC is going to have that, too.

http://gcc.gnu.org/wiki/LinkTimeOptimization

In fact, it already does have it: LTO is supported by GCC 4.5.0, which was released in April. (Although a bunch of LTO improvements will be included in the forthcoming GCC 4.6 release.)

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