From: Jakub Jelinek <jakub@redhat.com>
To: Florian Weimer <fweimer@redhat.com>
Cc: Richard Biener via Gcc <gcc@gcc.gnu.org>,
GNU C Library <libc-alpha@sourceware.org>,
Joseph Myers <joseph@codesourcery.com>,
libc-coord@lists.openwall.com
Subject: Re: [libc-coord] Add new ABI '__memcmpeq()' to libc
Date: Fri, 17 Sep 2021 11:12:19 +0200 [thread overview]
Message-ID: <20210917091219.GL304296@tucnak> (raw)
In-Reply-To: <87y27vhbel.fsf@oldenburg.str.redhat.com>
On Fri, Sep 17, 2021 at 10:08:34AM +0200, Florian Weimer via Gcc wrote:
> > So the compiler would emit a call to __memcmpeq and at the same time
> > emit a weak alias of __memcmpeq to memcmp so the program links
> > when the libc version targeted does not provide __memcmpeq? Or would
> > glibc through <string.h> magically communicate the availability of the new ABI
> > without actually declaring the function?
>
> I do not think ELF provides that capability.
>
> We can add a declaration to <string.h> to communicate the availability.
> I think this is how glibc (and other libcs) communicate the availability
> of non-standard interfaces to GCC.
Yeah, that is what we've done in the past, e.g. in case of stpcpy.
Jakub
next prev parent reply other threads:[~2021-09-17 9:12 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-16 17:02 Noah Goldstein
2021-09-16 17:55 ` [libc-coord] " Chris Kennelly
2021-09-16 18:31 ` Noah Goldstein
2021-09-16 20:32 ` Chris Kennelly
2021-09-16 20:35 ` Joseph Myers
2021-09-16 20:55 ` enh
2021-09-17 7:43 ` Richard Biener
2021-09-17 8:08 ` Florian Weimer
2021-09-17 8:31 ` Richard Biener
2021-09-17 8:37 ` Florian Weimer
2021-09-17 9:30 ` Richard Biener
2021-09-17 17:40 ` Noah Goldstein
2021-09-17 9:12 ` Jakub Jelinek [this message]
2021-09-17 16:55 ` Martin Sebor
2021-09-17 14:19 ` Joseph Myers
2021-09-17 14:26 ` Florian Weimer
2021-09-21 19:53 ` Noah Goldstein
2021-09-22 17:46 ` Christoph Müllner
2021-09-22 18:15 ` Noah Goldstein
2021-09-16 21:27 ` James Y Knight
2021-09-16 21:42 ` Joseph Myers
2021-09-16 21:50 ` enh
2021-09-16 21:59 ` Noah Goldstein
2021-09-16 22:17 ` Chris Kennelly
2021-09-16 22:36 ` Joseph Myers
2021-09-16 23:24 ` Noah Goldstein
2021-09-18 1:36 ` James Y Knight
2021-10-26 22:47 ` Noah Goldstein
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