From: Jeff King <peff@peff.net>
To: "SZEDER Gábor" <szeder.dev@gmail.com>
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: Wed, 24 Jun 2020 11:54:20 -0400 [thread overview]
Message-ID: <20200624155420.GC2088459@coredump.intra.peff.net> (raw)
In-Reply-To: <20200624114313.GJ2898@szeder.dev>
On Wed, Jun 24, 2020 at 01:43:13PM +0200, SZEDER Gábor wrote:
> > static uint32_t counter = 1; /* avoid null oid */
> > const unsigned hashsz = the_hash_algo->rawsz;
> > - unsigned char *out = xcalloc(hashsz, 1);
> > - put_be32(out + hashsz - 4, counter++);
> > - return out;
> > + struct object_id oid;
> > + char *hex = xmallocz(GIT_MAX_HEXSZ);
> > +
> > + oidclr(&oid);
> > + put_be32(oid.hash + hashsz - 4, counter++);
> > + return oid_to_hex_r(hex, &oid);
> > }
>
> 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
Interesting. The only change on this line is swapping out the local
"unsigned char *" for an object_id, which also stores an "unsigned
char" (though as an array). And while put_be32() takes a void pointer,
it's inlined and treats it the argument an "unsigned char *" internally.
So I'm not sure I see that any type punning is going on at all.
I'll see if I can appease the compiler, though.
-Peff
next prev parent reply other threads:[~2020-06-24 15:54 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 [this message]
2020-06-25 15:49 ` Jeff King
2020-06-25 20:45 ` SZEDER Gábor
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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