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[bug-diffutils] bug#17075: bug#17075: diff - - exits immediately

From: Paul Eggert
Subject: [bug-diffutils] bug#17075: bug#17075: diff - - exits immediately
Date: Tue, 25 Mar 2014 16:42:19 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0

I dunno, even that sounds dubious, as it's incomplete. For example, when A and B are different files, 'diff -q A B' reads neither A nor B if it determines via the 'stat' syscall that the files are different sizes.

More generally, I'm not sure it's necessary or wise to describe exactly the optimizations 'diff' uses to avoid reading files. Quite possibly, though, I'm not understanding the problem that caused you to file the bug report in the first place.

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