I discovered today that installing the latest Xcode from Apple gives you access to both GCC 4.0 and GCC 4.2, but the default is GCC 4.0. The more recent compiler fixes a bug which prevented Crypto++ from using 64-bit multiplications on x86-64. So if you're compiling for -arch x86_64, you should set CXX=c++-4.2 for the best speed.
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