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From: Jeff King <peff@peff.net>
To: Junio C Hamano <gitster@pobox.com>
Cc: santiago@nyu.edu, git@vger.kernel.org, sunshine@sunshineco.com,
	walters@verbum.org, Lukas Puehringer <luk.puehringer@gmail.com>
Subject: Re: [PATCH v6 4/6] builtin/tag: add --format argument for tag -v
Date: Wed, 18 Jan 2017 13:28:44 -0500	[thread overview]
Message-ID: <20170118182843.iyico5jpii6a3z7i@sigill.intra.peff.net> (raw)
In-Reply-To: <xmqqh94wb4y0.fsf@gitster.mtv.corp.google.com>

On Wed, Jan 18, 2017 at 10:25:59AM -0800, Junio C Hamano wrote:

> > This triggers:
> >
> >     builtin/tag.c: In function 'cmd_tag':
> >     builtin/tag.c:451:3: error: passing argument 3 of
> >     'for_each_tag_name' discards 'const' qualifier from pointer target type [-Werror]
> >        return for_each_tag_name(argv, verify_tag, format);
> >
> > Either for-each-tag-name's new parameter needs to be typed
> > correctly, or the type of the "format" variable needs to be updated.
> 
> Squashing the following into this commit solves this issue with the
> former approach.  The lines it touches are all from 4/6 and I view
> all of it as general improvement, including type correctness and
> code formatting.
> 
> diff --git a/builtin/tag.c b/builtin/tag.c
> index f81273a85a..fbb85ba3dc 100644
> --- a/builtin/tag.c
> +++ b/builtin/tag.c
> @@ -66,10 +66,10 @@ static int list_tags(struct ref_filter *filter, struct ref_sorting *sorting, con
>  }
>  
>  typedef int (*each_tag_name_fn)(const char *name, const char *ref,
> -				const unsigned char *sha1, void *cb_data);
> +				const unsigned char *sha1, const void *cb_data);

This would bite us later if one of the iterators really does need to
pass something mutable. But as this iteration interface is confined to
builtin/tag.c, I think it's a nice simple fix.

A more general fix would be to pass a non-const pointer to const pointer
(preferably inside a struct for readability). But I don't see any need
for that complexity here.

-Peff

  parent reply	other threads:[~2017-01-18 18:30 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-01-17 23:37 [PATCH v6 0/6] Add --format to tag verification santiago
2017-01-17 23:37 ` [PATCH v6 1/6] gpg-interface,tag: add GPG_VERIFY_OMIT_STATUS flag santiago
2017-01-17 23:37 ` [PATCH v6 2/6] ref-filter: add function to print single ref_array_item santiago
2017-01-17 23:37 ` [PATCH v6 3/6] builtin/verify-tag: add --format to verify-tag santiago
2017-01-17 23:37 ` [PATCH v6 4/6] builtin/tag: add --format argument for tag -v santiago
2017-01-18  0:02   ` Junio C Hamano
2017-01-18  0:05   ` Junio C Hamano
2017-01-18  0:19   ` Junio C Hamano
2017-01-18 18:25     ` Junio C Hamano
2017-01-18 18:28       ` Santiago Torres
2017-01-18 18:44         ` Junio C Hamano
2017-01-18 18:50           ` Santiago Torres
2017-01-18 20:16           ` Eric Wong
2017-01-19  0:37             ` Eric Wong
2017-01-18 18:52         ` Junio C Hamano
2017-01-18 18:28       ` Jeff King [this message]
2017-01-18 18:49         ` Junio C Hamano
2017-01-17 23:37 ` [PATCH v6 5/6] t/t7030-verify-tag: Add --format specifier tests santiago
2017-01-17 23:37 ` [PATCH v6 6/6] t/t7004-tag: " santiago
2017-01-18  0:07 ` [PATCH v6 0/6] Add --format to tag verification Junio C Hamano

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