lslimani wrote:

> > > But I am wondering if we can use this in canReuse too.
> > 
> > Well ig we could, but I'm a bit worried about perfs on projects with lots 
> > of modules.
> 
> I think at least this should be  faster than the current mechanism.

Alone yes it is, and I think by a lot. The thing is that, I'm not sure but I 
think that some cases that don't need to be handled in hasNewerDependnecies, do 
have to be handled in canReuse, thus we would have to include both checks. But 
I agree this should be looked into further to be sure.

https://github.com/llvm/llvm-project/pull/234181
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