From: Junio C Hamano <gitster@pobox.com>
Date: Thu, 12 Apr 2018 21:46:09 GMT
Subject: Re: Optimizing writes to unchanged files during merges?
Message-ID: <xmqq604w2j4u.fsf@gitster-ct.c.googlers.com>
In-Reply-To: <CA+55aFzLZ3UkG5svqZwSnhNk75=fXJRkvU1m_RHBG54NOoaZPA@mail.gmail.com>

Linus Torvalds <torvalds@linux-foundation.org> 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.