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Re: Optimizing writes to unchanged files during merges?




Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> writes:

> Now, the reason it was marked as changed is that the xfs branch _had_
> in fact changed it, but the changes were already upstream and got
> merged away. But the file still got written out (with the same
> contents it had before the merge), and 'make' obviously only looks at
> modification time, so make rebuilt everything.

Thanks for a clear description of the issue.  It does sound
interesting.