How to get quartus_map to generate a netlist file for bottom-up synthesis

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It drastically decreases implementation time for large designs (since code that has not changed does not get needlessly recompiled).

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Ok, thanks, this makes sense. Take a look a the Quartus Handbook. They have some incremental design tools, and I vaguely recall seeing a smart makefile helper function in there too. Supposedly it ensures that the tool will only recompile and P&R the design changes, rather than the whole design. I plan on reading through that stuff again sometime soon. If I find the specific information I am recalling, I'll add it to this discussion.

Cheers,

Dave