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Re: touch and utimens troubles on new/old software combinations
From: |
Jim Meyering |
Subject: |
Re: touch and utimens troubles on new/old software combinations |
Date: |
Mon, 02 Jun 2008 20:43:48 +0200 |
Mike Frysinger <address@hidden> wrote:
> a recent gnulib commit (faeb3e6b21...) causes trouble for some packages (such
> as touch in coreutils) on certain combinations of software. for example, if
> you're running a recent version of glibc (say 2.7) compiled against recent
> kernel headers (say 2.6.25) but execute on an older kernel (say 2.6.18), then
> the resulting touch binary will attempt to use utimensat() which fails with
> ENOSYS.
>
> i'm not sure which route is best for gnulib: should it try each version at
> runtime and slowly fall back, or should it review the gnu/stubs.h header
> provided by glibc so that it knows ahead of time that the utimensat() symbol,
> while available in the C library, is not actually usable.
Hi Mike,
coreutils/gnulib have always run certain configure-time tests to
determine kernel/libc characteristics so that doing that is not
necessary at run-time. Often it would be prohibitively expensive (or
essentially impossible) to perform such tests at run time. This is
especially important for a minimalist tool like touch, but even "larger"
tools like cp and ls can perform only very limited (and lightweight)
system-attribute-detection at run time -- to do otherwise would induce
unacceptable overhead.
I'm afraid the best advice I can give you is to run the tools on the same
(or newer) version of the system on which you configured the package.
Jim
- touch and utimens troubles on new/old software combinations, Mike Frysinger, 2008/06/02
- Re: touch and utimens troubles on new/old software combinations,
Jim Meyering <=
- Re: touch and utimens troubles on new/old software combinations, Eric Blake, 2008/06/02
- Re: touch and utimens troubles on new/old software combinations, Bob Proulx, 2008/06/02
- Re: touch and utimens troubles on new/old software combinations, Daniel Jacobowitz, 2008/06/02
- Re: touch and utimens troubles on new/old software combinations, Mike Frysinger, 2008/06/02
- Re: touch and utimens troubles on new/old software combinations, Andreas Schwab, 2008/06/02
- Re: touch and utimens troubles on new/old software combinations, Mike Frysinger, 2008/06/02
- Re: touch and utimens troubles on new/old software combinations, Eric Blake, 2008/06/02
- Re: touch and utimens troubles on new/old software combinations, Andreas Schwab, 2008/06/03
- Re: touch and utimens troubles on new/old software combinations, Eric Blake, 2008/06/03
- Re: touch and utimens troubles on new/old software combinations, Andreas Schwab, 2008/06/02