From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mout-p-202.mailbox.org (mout-p-202.mailbox.org [80.241.56.172])
	(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by smtp.subspace.kernel.org (Postfix) with ESMTPS id 899D515A8
	for <c-std-porting@lists.linux.dev>; Wed, 19 Apr 2023 01:28:36 +0000 (UTC)
Received: from smtp1.mailbox.org (smtp1.mailbox.org [IPv6:2001:67c:2050:b231:465::1])
	(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
	 key-exchange ECDHE (P-384) server-signature RSA-PSS (4096 bits) server-digest SHA256)
	(No client certificate requested)
	by mout-p-202.mailbox.org (Postfix) with ESMTPS id 4Q1NKj08gjz9slw;
	Wed, 19 Apr 2023 03:21:29 +0200 (CEST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=aarsen.me; s=MBO0001;
	t=1681867289;
	h=from:from:reply-to:subject:subject:date:date:message-id:message-id:
	 to:to:cc:mime-version:mime-version:content-type:content-type:
	 in-reply-to:in-reply-to:references:references;
	bh=kDyKZ2FWKSKlQfGen0c5C1gzvTwR83QaJmwUGkp1sRI=;
	b=wnermrWCM+pgQUy/+1r1FB+5rmidmhTgPO5QaoQw1iiIdPYn65Gl8o0BM/Nvf8iwZjS4Du
	9q5TXex4eCz10rOTd6Jw3du3WuhM4fp4wnrMsXi/Uh+JoF1Io/AKUDBzDENNREQRv5di1t
	x0kQOIebel6z768pyDAlmdb3/StX1/OASH2wEm5gLiexAvVb6MP0GH66YkH0g6Jl7cWkiB
	XU/G0Z3mKd6Eu3lFknGhuYVLT3n0gfh8iXT56ErDlk/IOVsFo6V+AlVf7p63rakdqMuCF+
	nmlgzcv/zt7Aauh4J6LHhOaAL9TH6CnQUWnzLcqRoG/BpED++Wzc8jLNHSqdFg==
References: <87y1mpe11q.fsf@oldenburg.str.redhat.com>
 <95f7777d83382f5cf7701e0e8e6bbe9b1698778a.camel@debian.org>
From: Arsen =?utf-8?Q?Arsenovi=C4=87?= <arsen@aarsen.me>
To: debian-devel@lists.debian.org, debian-gcc@lists.debian.org,
 c-std-porting@lists.linux.dev
Subject: Re: RFC: More C errors by default in GCC 14 (no more implicit
 function declarations etc.)
Date: Wed, 19 Apr 2023 03:14:52 +0200
In-reply-to: <95f7777d83382f5cf7701e0e8e6bbe9b1698778a.camel@debian.org>
Message-ID: <86a5z4mzu2.fsf@aarsen.me>
Precedence: bulk
X-Mailing-List: c-std-porting@lists.linux.dev
List-Id: <c-std-porting.lists.linux.dev>
List-Subscribe: <mailto:c-std-porting+subscribe@lists.linux.dev>
List-Unsubscribe: <mailto:c-std-porting+unsubscribe@lists.linux.dev>
MIME-Version: 1.0
Content-Type: multipart/signed; boundary="=-=-=";
	micalg=pgp-sha512; protocol="application/pgp-signature"
X-Rspamd-Queue-Id: 4Q1NKj08gjz9slw

--=-=-=
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable


Paul Wise <pabs@debian.org> writes:

> On Tue, 2023-04-18 at 16:07 +0200, Florian Weimer wrote:
>
>> TL;DR: I want to propose a GCC 14 change which will impact
>> distributions, so I'd like to gather some feedback from Debian.
>
> Is this change being made the upstream defaults?
>
> Or will it be a distro override like the hardening flags are?

The intention is to make this a default, in order to brace people for a
future C default standard version changes.

>> I would appreciate some discussion on the Debian impact.
>
> Since most of the Debian archive can be reproducibly built, it seems
> like the way to gauge the impact of this change on Debian would be to
> do two archive rebuilds, once without the flags and once with the
> flags, then compare the two builds for each package using diffoscope.

This seems reasonable.  I suspect changes largely in configure scripts
based on our prior experience[1].

Have a lovely night.

> The reproducible builds fuzzing tests get 96.2% reproducible,
> this would only go up when not varying most of the fuzzed things.
>
> https://tests.reproducible-builds.org/debian/reproducible.html
>
> The existing documentation for Debian archive rebuilds is outdated and
> deleted, but Lucas Nusbaum and others have been doing them for a while.
>
> https://wiki.debian.org/MassRebuilds
> https://wiki.debian.org/qa.debian.org/ArchiveTesting?action=3Drecall&rev=
=3D23

[1] https://bugs.gentoo.org/870412
=2D-=20
Arsen Arsenovi=C4=87

--=-=-=
Content-Type: application/pgp-signature; name="signature.asc"

-----BEGIN PGP SIGNATURE-----

iOYEARYKAI4WIQT+4rPRE/wAoxYtYGFSwpQwHqLEkwUCZD9CFV8UgAAAAAAuAChp
c3N1ZXItZnByQG5vdGF0aW9ucy5vcGVucGdwLmZpZnRoaG9yc2VtYW4ubmV0RkVF
MkIzRDExM0ZDMDBBMzE2MkQ2MDYxNTJDMjk0MzAxRUEyQzQ5MxAcYXJzZW5AYWFy
c2VuLm1lAAoJEFLClDAeosSTnl0BANhzJx/iCmsyTDxsmMXOqIjMo6kOtV+1oRLj
CPBcG3YtAP9S5pqQv4G7iPiloh4e8cCeAFmzIqeXKqEhk9QnbA8VAA==
=whP0
-----END PGP SIGNATURE-----
--=-=-=--