Mac OSX 10.6 compiler: a puzzling experience with 32 vs 64 bit

Question

I have trouble understanding the gcc compiler provided by OSX 10.6 snow leopard, mainly because of my lack of experience with 64 bits environments.

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Answer 1

This answer is wrong, but see comments below

The real question is... how did you get a 32-bit version of OSX? I wasn't aware that Snow Leopard had a 32-bit version, as all of Apple's Intel chips are Core 2 or Xeon, which support the x86_64 architecture.

Oh, and Snow Leopard only works on Intel chips.

Edit: Apparently Snow Leopard starts in 32-bit mode.