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Apple is moving away from gcc to clang/llvm. And for the past several
years, the architecture targets have been i386, x86_64, ppc, ppc64,
armv6, armv7.

Rather than putting this into the Makefile, I would much enjoy a wiki
page or something that talks about different build flag optimizations
for different compilers, perhaps with some benchmarks.

Here's a short example of some things I wonder about:

-Os vs. -O2 vs. -O3, what are the size and speed tradeoffs?

dynamic library vs static linking (performance implications on
platforms and architectures)

What other flags make a difference (and on what compilers, platforms,
and architectures)?

Beginning iPhone Games Development