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Message-ID: <CAGg_6+OWhJ3si5sUpa1UY6ZxRtEcyTTvbG44E6Zi=w8ehee=YQ@mail.gmail.com>
Date: Wed, 7 Jan 2026 20:37:15 -0600
From: Nevin Liber <nevin@...usplusguy.com>
To: David Svoboda <svoboda@...t.org>
Cc: Alejandro Colomar <une+c@...jandro-colomar.es>, Robert Seacord <rcseacord@...il.com>,
"sc22wg14@...n-std. org" <sc22wg14@...n-std.org>, Florian Weimer <fweimer@...hat.com>,
"Carlos O'Donell" <carlos@...hat.com>, Aaron Ballman <aaron@...onballman.com>,
"libc-alpha@...rceware.org" <libc-alpha@...rceware.org>,
"musl@...ts.openwall.com" <musl@...ts.openwall.com>,
"linux-man@...r.kernel.org" <linux-man@...r.kernel.org>
Subject: Re: [SC22WG14.34672] n3752, alx-0029r8 - Restore the traditional
realloc(3) specification
On Wed, Jan 7, 2026 at 8:31 AM David Svoboda <svoboda@...t.org> wrote:
> Here are some more thoughts on n3752
> [...]
> WRT this text:
>
> Code written for platforms returning a null pointer can be
> migrated to platforms returning non-null, without significant
> issues.
>
> I am very skeptical that this is indeed true. But to be precise, this is
> Glibc's problem rather than WG14's. If they are willing to change glibc to
> return non-null on realloc(0), then I am willing to agree to this change in
> ISO C.
>
> Is there any evidence that changing this behavior breaks no code? Any
> test failures? Any surveys?
>
And if it breaks no code, is that because this is a corner case that
doesn't occur in practice? That in itself doesn't mean we shouldn't change
it.
> This paper ignores Windows other than to mention that it would need to
> change too. I doubt MS will update MSVC to accommodate this paper. So
> accepting this paper makes MSVC noncompliant.
>
This is the part that is troublesome to me. What is the point of changing
this behavior if two (or even just one) major implementations are going to
ignore it?
--
Nevin ":-)" Liber <mailto:nevin@...usplusguy.com <nevin@...loverlord.com>>
+1-847-691-1404
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