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If you're using machines with different architectures, you're going to have to recompile anyway; it seems to me that version control is, in general, the right answer here. That is:

1. Hack until you want to try something.
2. Check it in.
3. Check it out on the other machine and build it (this could be scripted to all happen in one step)

...and iterate. This has the added benefit of making you check in a lot, which is good programming practice, and keeps you from clobbering different builds of your various binaries.

It's not quite as fast, but (at least in the different-architecture case) you're never going to win, anyway.