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Date: Fri, 17 Sep 2021 11:12:19 +0200
From: Jakub Jelinek <>
To: Florian Weimer <>
Cc: Richard Biener via Gcc <>,
        GNU C Library <>,
        Joseph Myers <>,
Subject: Re: Add new ABI '__memcmpeq()' to libc

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.


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