From: David Kastrup <dak@gnu.org>
To: Andreas Schwab <schwab@linux-m68k.org>
Cc: Johannes Sixt <j6t@kdbg.org>,
Michael Haggerty <mhagger@alum.mit.edu>,
"brian m. carlson" <sandals@crustytoothpaste.net>,
git@vger.kernel.org
Subject: Re: [PATCH 1/9] Define a structure for object IDs.
Date: Mon, 05 May 2014 07:19:35 +0200 [thread overview]
Message-ID: <87lhugu7iw.fsf@fencepost.gnu.org> (raw)
In-Reply-To: <87ppjt6xjv.fsf@igel.home> (Andreas Schwab's message of "Sun, 04 May 2014 23:31:16 +0200")
Andreas Schwab <schwab@linux-m68k.org> writes:
> Johannes Sixt <j6t@kdbg.org> writes:
>
>> Isn't internal padding only allowed between members to achieve correct
>> alignment of later members, and at the end only sufficient padding so
>> that members are aligned correctly when the struct is part of an array?
>
> The standard allows arbitrary internal padding, it doesn't have to be
> minimal.
What the standard does guarantee is that a pointer to a struct can be
cast to a pointer to its first member and vice versa. It does not as
far as I can see guarantee that a pointer to something of the same type
of its first member can be converted to a pointer to a struct even if
the struct only contains a member of such type.
--
David Kastrup
next prev parent reply other threads:[~2014-05-06 16:08 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-03 20:12 [RFC PATCH 0/9] Use a structure for object IDs brian m. carlson
2014-05-03 20:12 ` [PATCH 1/9] Define " brian m. carlson
2014-05-04 6:07 ` Michael Haggerty
2014-05-04 9:21 ` Johannes Sixt
2014-05-04 9:43 ` David Kastrup
2014-05-04 10:55 ` Andreas Schwab
2014-05-04 20:18 ` Johannes Sixt
2014-05-04 21:31 ` Andreas Schwab
2014-05-05 5:19 ` David Kastrup [this message]
2014-05-05 9:23 ` Andreas Schwab
2014-05-05 9:33 ` James Denholm
2014-05-05 9:50 ` David Kastrup
2014-05-05 10:52 ` Michael Haggerty
2014-05-05 11:05 ` Andreas Schwab
2014-05-05 11:23 ` David Kastrup
2014-05-05 18:16 ` Felipe Contreras
2014-05-04 12:29 ` Duy Nguyen
2014-05-04 16:07 ` brian m. carlson
2014-05-04 16:48 ` Andreas Schwab
2014-05-04 17:07 ` David Kastrup
2014-05-04 17:24 ` Andreas Schwab
2014-05-04 17:44 ` David Kastrup
2014-05-04 18:01 ` Andreas Schwab
2014-05-03 20:12 ` [PATCH 2/9] bisect.c: convert to use struct object_id brian m. carlson
2014-05-03 20:12 ` [PATCH 3/9] archive.c: " brian m. carlson
2014-05-03 20:12 ` [PATCH 4/9] zip: use GIT_OID_HEXSZ for trailers brian m. carlson
2014-05-03 20:12 ` [PATCH 5/9] branch.c: convert to use struct object_id brian m. carlson
2014-05-03 20:12 ` [PATCH 6/9] bulk-checkin.c: " brian m. carlson
2014-05-03 20:12 ` [PATCH 7/9] bundle.c: convert leaf functions to " brian m. carlson
2014-05-06 14:42 ` Michael Haggerty
2014-05-03 20:12 ` [PATCH 8/9] cache-tree: convert struct cache_tree to use object_id brian m. carlson
2014-05-06 14:53 ` Michael Haggerty
2014-05-06 15:02 ` Michael Haggerty
2014-05-03 20:12 ` [PATCH 9/9] diff: convert struct combine_diff_path to object_id brian m. carlson
2014-05-06 15:08 ` Michael Haggerty
2014-05-03 22:49 ` [RFC PATCH 0/9] Use a structure for object IDs brian m. carlson
2014-05-04 6:35 ` Michael Haggerty
2014-05-04 9:19 ` Johannes Sixt
2014-05-04 17:54 ` brian m. carlson
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