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bug#7529: Bug#605639: deal better with different filesystem timestamp re

From: Paul Eggert
Subject: bug#7529: Bug#605639: deal better with different filesystem timestamp resolutions
Date: Fri, 03 Dec 2010 10:05:53 -0800
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20101027 Thunderbird/3.0.10

On 12/03/10 02:03, Jim Meyering wrote:

> Would you mind adding a "Bug fixes" entry for this
> in coreutils' NEWS file?  It'd be nice to commit that
> along with an update of the gnulib submodule to the latest.

Sure, done, with this notice:

  cp -u no longer does unnecessary copying merely because the source
  has finer-grained time stamps than the destination.

> As for a test, it shouldn't be too hard to create a root-only test
> on linux/gnu systems, since _PC_TIMESTAMP_RESOLUTION is not defined.
> Create two loop-mounted file systems of types that have the desired
> difference in time stamp resolution, and run commands like Dan did.

Hmm, well, I can see a lot going wrong with that, such as garbage in the
mount table if the test is interrupted.  (Also, there's the little problem
that I lack root access on the hosts that I do builds on these days: does
that get me off the hook?  :-)

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