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Re: POSIX ruling on up-to-date vs. identical timestamps

From: Bob Friesenhahn
Subject: Re: POSIX ruling on up-to-date vs. identical timestamps
Date: Thu, 21 Aug 2014 12:22:51 -0500 (CDT)
User-agent: Alpine 2.01 (GSO 1266 2009-07-14)

On Thu, 21 Aug 2014, Eric Blake wrote:

The POSIX recommendation was therefore that GNU should change its
behavior to act like HP-UX, and consider identical timestamps as
out-of-date, because the standard will be fixed to allow HP-UX behavior.

A change like this may result in some builds which never complete (or take much longer) because the timestamp rules require that something be rebuilt (tail chasing). This is particularly a problem for recursive builds which may enter the same directories multiple times.

Bob Friesenhahn
address@hidden, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

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