GNU bug report logs - #63850
cp fails for files > 2 GB if copy offload is unsupported

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Package: coreutils;

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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From: Arsen Arsenović <arsen <at> aarsen.me>
To: Mike Gilbert <floppym <at> gentoo.org>
Cc: Paul Eggert <eggert <at> cs.ucla.edu>, P <at> draigbrady.com, sam <at> gentoo.org, 63850 <at> debbugs.gnu.org
Subject: bug#63850: cp fails for files > 2 GB if copy offload is unsupported
Date: Sat, 03 Jun 2023 19:12:41 +0200

[Message part 1 (text/plain, inline)]
Mike Gilbert <floppym <at> gentoo.org> writes:

> The macro in copy-file-range.m4 performs a build time version check
> against the installed linux headers (/usr/include/linux).
>
> In this case, headers from linux-6.1 are being used at build time.
> However, the code is being run on a linux-4.19 kernel.
>
> Generally speaking, syscall checks must be done at run time on Linux,
> not build time.

Right, the replacement should always be emitted (perhaps with glibc stub
detection, and omitted if one is found, though).  linux-headers is a
weird library, in that it makes no implication about the compatibility
level of your resulting executable, so, no assumption about runtime
versions or behavior can be made from static checks.
-- 
Arsen Arsenović

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This bug report was last modified 2 years and 41 days ago.

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