GNU bug report logs -
#63850
cp fails for files > 2 GB if copy offload is unsupported
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Reported by: Sam James <sam <at> gentoo.org>
Date: Fri, 2 Jun 2023 15:50:02 UTC
Severity: normal
Done: Paul Eggert <eggert <at> cs.ucla.edu>
Bug is archived. No further changes may be made.
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Message #58 received at 63850-done <at> debbugs.gnu.org (full text, mbox):
On 2023-06-06 03:02, Sam James wrote:
> Thanks Paul. Do you know if there's any other cases of this in gnulib?
There's no other use of linux/version.h in Gnulib. However, this doesn't
mean there are no other instances of the problem, as it's common to
assume that you'll run on a host no older than the build host. Every use
of Autoconf macros like AC_RUN_IFELSE assume this sort of thing, and I
would not be surprised if there are other examples of this more-general
problem when some builders (unwisely) build apps intended to run on
platforms older than the build platform. (For what it's worth, I count
331 uses of AC_RUN_IFELSE in Gnulib; it'd be a pain to audit them all.)
It's OK to build glibc for Linux kernels somewhat older than the build
kernel, since glibc explicitly exports that. But it's not OK to build
other packages that way, since they don't support it. You'll get away
with it in many cases, but when it doesn't work then the problem is on
the builder, not on the packages being built.
> (or whether, by chance, if you know off the top of your head if any
> other gnulib consumers definitely use copy_file_range?)
Other coreutils programs like 'install' use copy_file_range.
Emacs uses it. I just now installed the following patch into
bleeding-edge Emacs to work around the problem, by updating to current
Gnulib. This workaround should appear in Emacs 30, whenever that happens
(not for a year or two I'd think, as Emacs 29 isn't out yet).
https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=a902156068ab071f93cc9bbd34cd320919b74064
PS. I'm boldly marking the coreutils bug as fixed.
This bug report was last modified 1 year and 350 days ago.
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