No offense, but I think you're reading too much into my casual comments here to guide your understanding of waf, rather than the actual waf docs. Waf isn't opti

No offense, but I think you're reading too much into my casual comments here to guide your understanding of waf, rather than the actual waf docs. Waf isn't optimized for clean builds (quite the contrary), and neither you nor I know whether the waf defaults are insufficient for whatever Buck is being used for. I just pointed out the existence of that "fast_partial" thing to show how deep into waf internals a project-specific optimization effort could go. But discussions about optimization are pointless without real world measurements and data.