From: Paul Eggert <eggert@cs.ucla.edu>
To: Albert ARIBAUD <albert.aribaud@3adev.fr>
Cc: libc-alpha@sourceware.org, bug-gnulib@gnu.org
Subject: Re: [PATCH 1/1] Y2038: add function __difftime64
Date: Thu, 05 Jul 2018 19:40:00 -0000 [thread overview]
Message-ID: <90246a4c-86cc-c191-8564-e6eea556fa13@cs.ucla.edu> (raw)
In-Reply-To: <20180705203637.66ae4947@athena>
Albert ARIBAUD wrote:
> I would like to know
> if the following assumptions are correct:
>
> - gnulib contains a year2038 module which is only intended to check
> whether time_t is limited to Y2038 or not.
Although true for now, in the long run year2038 could be changed to enable
macros that will cause the implementation to use 64- instead of 32-bit time_t.
This is a plausible thing to do once glibc has such a macro.
> - gnulib does not provide difftime either, so ATM a difftime patch
> would only make sense in glibc, not gnulib.
Although Gnulib hasn't needed a difftime module yet, it might need one once this
32- vs 64-bit time_t stuff lands into glibc, so let's keep difftime.c usable for
Gnulib.
> - gnulib ... makes no assumption that it will be compiled into a shared object
> form which will provide the same functionalities for both 64-bit and
> 32-bit callers.
Although that's generally true, Gnulib can be used in such shared objects by
compiling it twice (once for each model), using different names for each entry
point. I vaguely recall some people doing this sort of thing for 32- vs 64-bit
file offsets, though I don't recommend the practice myself.
next prev parent reply other threads:[~2018-07-05 19:40 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-20 12:14 [PATCH 0/1] Y2038 support batch 3 - difftime Albert ARIBAUD (3ADEV)
2018-06-20 12:14 ` [PATCH 1/1] Y2038: add function __difftime64 Albert ARIBAUD (3ADEV)
2018-06-20 19:29 ` Paul Eggert
2018-06-20 20:55 ` Albert ARIBAUD
2018-06-21 21:17 ` Paul Eggert
2018-06-25 22:32 ` Albert ARIBAUD
2018-06-25 23:56 ` Paul Eggert
2018-06-27 11:03 ` Albert ARIBAUD
2018-07-05 18:36 ` Albert ARIBAUD
2018-07-05 19:13 ` Zack Weinberg
2018-07-05 19:40 ` Paul Eggert [this message]
2018-07-05 20:38 ` Albert ARIBAUD
2018-07-05 21:17 ` Bruno Haible
2018-07-06 5:06 ` Albert ARIBAUD
2018-07-06 22:54 ` Paul Eggert
2018-07-06 22:40 ` Paul Eggert
2018-07-06 22:37 ` Paul Eggert
2018-07-17 20:40 ` Joseph Myers
2018-07-05 20:50 ` time_t in gnulib Bruno Haible
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