linux-kernel - Re: [PATCH] uapi: Make __{u,s}64 match {u,}int64

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Message-Id: <1e3867cd-2c8b-4fe1-93a6-c6ae34120f6b@www.fastmail.com>
Date:   Thu, 02 Dec 2021 15:48:21 -0500
From:   "Zack Weinberg" <zack@...folio.org>
To:     "David Howells" <dhowells@...hat.com>
Cc:     "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "Florian Weimer" <libc-alpha@...rceware.org>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "David Laight" <David.Laight@...lab.com>,
        "ltp@...ts.linux.it" <ltp@...ts.linux.it>
Subject: Re: [PATCH] uapi: Make __{u,s}64 match {u,}int64_t in userspace

On Thu, Dec 2, 2021, at 10:01 AM, David Howells via Libc-alpha wrote:
> Zack Weinberg <zack@...folio.org> wrote:
>> I could be persuaded otherwise with an example of a program for which
>> changing __s64 from 'long long' to 'long' would break *binary* backward
>> compatibility, or similarly for __u64.
>
> C++ could break.

That's too hypothetical to be actionable.  I would like to see a _specific program_, and I would like it to be one that already exists in the world and was not written as a test case for this hypothetical ABI break.

zw