jhuber6 wrote:

> we need a way to inform the build system that an incremental rebuild should 
> be triggered, correct?

Yes, and my question was if we could manage this automatically somehow via 
`-fdepfile-entry`. I don't know the subtleties here, but from what I can see 
this PR duplicates the depfile and tracks them separately, which I don't think 
is what we want. Ideally we have the single one for the host that also knows 
the device dependencies in addition to the host dependencies.

https://github.com/llvm/llvm-project/pull/176072
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