[anyfoo]

I think that's fair. On top of that, being a low level system programmer, I think I'm pretty good at realizing/intuiting when something critical changed that needs me to nuke the build dir, i.e. the manual work you mention to force a full recompile (and also good at noticing mismatched headers even through very weird symptoms).

I do have to switch between multiple SDK versions very often for example, and I always either nuke the build dir after doing that, or have separate build dirs per SDK in the first place.