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From: "SZEDER Gábor" <szeder.dev@gmail.com>
To: Jeff King <peff@peff.net>
Cc: git@vger.kernel.org, Eric Sunshine <sunshine@sunshineco.com>,
	Junio C Hamano <gitster@pobox.com>,
	Johannes Schindelin <Johannes.Schindelin@gmx.de>
Subject: Re: [PATCH 03/10] fast-export: store anonymized oids as hex strings
Date: Thu, 25 Jun 2020 22:45:32 +0200	[thread overview]
Message-ID: <20200625204532.GK2898@szeder.dev> (raw)
In-Reply-To: <20200625154948.GA3968780@coredump.intra.peff.net>

On Thu, Jun 25, 2020 at 11:49:48AM -0400, Jeff King wrote:
> On Wed, Jun 24, 2020 at 11:54:20AM -0400, Jeff King wrote:
> 
> > > GCC 4.8 complains about this change in our CI job:
> > > 
> > >   $ make CC=gcc-4.8 builtin/fast-export.o
> > >       CC builtin/fast-export.o
> > >   builtin/fast-export.c: In function ‘generate_fake_oid’:
> > >   builtin/fast-export.c:394:2: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
> > >     put_be32(oid.hash + hashsz - 4, counter++);
> > >     ^
> > >   cc1: all warnings being treated as errors


> So this really seems like a pointless false positive from the compiler,
> and it's a rather old compiler (the warning no longer triggers in gcc 6
> and up). Is it worth caring about? Ubuntu Trusty is out of standard
> support but not fully EOL'd until 2022. Debian jessie has gcc 4.9
> which triggers the warning, but will hit EOL in 5 days. If it were an
> actual breakage I'd be more concerned, but keeping such an old compiler
> -Werror clean doesn't seem that important.
> 
> I'd note also that none of the Actions CI jobs run with this compiler
> version. If we _do_ want to care about it, it might be worth covering it
> there.

C99 style 'for' loop initial declarations are still frowned upon in
Git's codebase, and as far as we know it GCC 4.8 is the the most
recent compiler that can reasonably detect it; see fb9d7431cf
(travis-ci: build with GCC 4.8 as well, 2019-07-18).


  reply	other threads:[~2020-06-25 20:45 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-19 13:23 [PATCH 0/3] fast-export: allow dumping anonymization mappings Jeff King
2020-06-19 13:25 ` [PATCH 1/3] fast-export: allow dumping the refname mapping Jeff King
2020-06-19 15:51   ` Eric Sunshine
2020-06-19 16:01     ` Jeff King
2020-06-19 16:18       ` Eric Sunshine
2020-06-19 17:45         ` Jeff King
2020-06-19 18:00           ` Eric Sunshine
2020-06-22 21:30             ` Jeff King
2020-06-19 19:20         ` Junio C Hamano
2020-06-22 21:32           ` Jeff King
2020-06-19 13:26 ` [PATCH 2/3] fast-export: anonymize "master" refname Jeff King
2020-06-19 13:29 ` [PATCH 3/3] fast-export: allow dumping the path mapping Jeff King
2020-06-19 16:00   ` Eric Sunshine
2020-06-19 19:24   ` Junio C Hamano
2020-06-22 21:38     ` Jeff King
2020-06-19 13:51 ` [PATCH 0/3] fast-export: allow dumping anonymization mappings Johannes Schindelin
2020-06-22 16:35   ` Junio C Hamano
2020-06-22 21:47 ` [PATCH v2 0/4] " Jeff King
2020-06-22 21:47   ` [PATCH v2 1/4] fast-export: allow dumping the refname mapping Jeff King
2020-06-22 21:48   ` [PATCH v2 2/4] fast-export: anonymize "master" refname Jeff King
2020-06-22 21:48   ` [PATCH v2 3/4] fast-export: refactor path printing to not rely on stdout Jeff King
2020-06-22 21:48   ` [PATCH v2 4/4] fast-export: allow dumping the path mapping Jeff King
2020-06-23 15:24   ` [alternative 0/10] fast-export: allow seeding the anonymized mapping Jeff King
2020-06-23 15:24     ` [PATCH 01/10] t9351: derive anonymized tree checks from original repo Jeff King
2020-06-23 15:24     ` [PATCH 02/10] fast-export: use xmemdupz() for anonymizing oids Jeff King
2020-06-23 15:24     ` [PATCH 03/10] fast-export: store anonymized oids as hex strings Jeff King
2020-06-24 11:43       ` SZEDER Gábor
2020-06-24 15:54         ` Jeff King
2020-06-25 15:49           ` Jeff King
2020-06-25 20:45             ` SZEDER Gábor [this message]
2020-06-25 21:15               ` Jeff King
2020-06-29 13:17                 ` Johannes Schindelin
2020-06-30 19:35                   ` Jeff King
2020-06-23 15:24     ` [PATCH 04/10] fast-export: tighten anonymize_mem() interface to handle only strings Jeff King
2020-06-23 15:24     ` [PATCH 05/10] fast-export: stop storing lengths in anonymized hashmaps Jeff King
2020-06-23 15:24     ` [PATCH 06/10] fast-export: use a flex array to store anonymized entries Jeff King
2020-06-23 15:25     ` [PATCH 07/10] fast-export: move global "idents" anonymize hashmap into function Jeff King
2020-06-23 15:25     ` [PATCH 08/10] fast-export: add a "data" callback parameter to anonymize_str() Jeff King
2020-06-24 19:58       ` Junio C Hamano
2020-06-23 15:25     ` [PATCH 09/10] fast-export: allow seeding the anonymized mapping Jeff King
2020-06-23 17:16       ` Eric Sunshine
2020-06-23 18:30         ` Jeff King
2020-06-23 20:30           ` Eric Sunshine
2020-06-24 15:47             ` Jeff King
2020-06-23 18:11       ` Eric Sunshine
2020-06-23 18:35         ` Jeff King
2020-06-23 20:35           ` Eric Sunshine
2020-06-24 15:48             ` Jeff King
2020-06-23 15:25     ` [PATCH 10/10] fast-export: anonymize "master" refname Jeff King
2020-06-23 19:34     ` [alternative 0/10] fast-export: allow seeding the anonymized mapping Junio C Hamano
2020-06-23 19:44       ` Jeff King
2020-06-25 19:48     ` [PATCH v2 0/11] " Jeff King
2020-06-25 19:48       ` [PATCH v2 01/11] t9351: derive anonymized tree checks from original repo Jeff King
2020-06-25 19:48       ` [PATCH v2 02/11] fast-export: use xmemdupz() for anonymizing oids Jeff King
2020-06-25 19:48       ` [PATCH v2 03/11] fast-export: store anonymized oids as hex strings Jeff King
2020-06-25 19:48       ` [PATCH v2 04/11] fast-export: tighten anonymize_mem() interface to handle only strings Jeff King
2020-06-25 19:48       ` [PATCH v2 05/11] fast-export: stop storing lengths in anonymized hashmaps Jeff King
2020-06-25 19:48       ` [PATCH v2 06/11] fast-export: use a flex array to store anonymized entries Jeff King
2020-06-25 19:48       ` [PATCH v2 07/11] fast-export: move global "idents" anonymize hashmap into function Jeff King
2020-06-25 19:48       ` [PATCH v2 08/11] fast-export: add a "data" callback parameter to anonymize_str() Jeff King
2020-06-25 19:48       ` [PATCH v2 09/11] fast-export: allow seeding the anonymized mapping Jeff King
2020-06-25 19:48       ` [PATCH v2 10/11] fast-export: anonymize "master" refname Jeff King
2020-06-25 19:48       ` [PATCH v2 11/11] fast-export: use local array to store anonymized oid Jeff King
2020-06-25 21:22       ` [PATCH v2 0/11] fast-export: allow seeding the anonymized mapping Junio C Hamano

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