From: Frederik Deweerdt <deweerdt@free.fr>
To: Phil Endecott <phil_arcwk_endecott@chezphil.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Subtleties of __attribute__((packed))
Date: Wed, 6 Dec 2006 14:01:38 +0000 [thread overview]
Message-ID: <20061206140138.GA16350@slug> (raw)
In-Reply-To: <1165411241721@dmwebmail.belize.chezphil.org>
On Wed, Dec 06, 2006 at 01:20:41PM +0000, Phil Endecott wrote:
> Dear All,
>
> I used to think that this:
>
> struct foo {
> int a __attribute__((packed));
> char b __attribute__((packed));
> ... more fields, all packed ...
> };
>
> was exactly the same as this:
>
> struct foo {
> int a;
> char b;
> ... more fields ...
> } __attribute__((packed));
>
> but it is not, in a subtle way.
>
This is likely a gcc bug isn't it? The gcc info page states:
Specifying this attribute for `struct' and `union' types is
equivalent to specifying the `packed' attribute on each of the
structure or union members.
Regards,
Frederik
next prev parent reply other threads:[~2006-12-06 14:02 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-06 13:20 Subtleties of __attribute__((packed)) Phil Endecott
2006-12-06 14:01 ` Frederik Deweerdt [this message]
2006-12-06 14:24 ` Phil Endecott
2006-12-06 15:04 ` Jan Blunck
2006-12-06 15:22 ` Phil Endecott
2006-12-06 15:54 ` Jan Blunck
2006-12-06 16:02 ` Andreas Schwab
2006-12-06 16:41 ` Jan Blunck
2006-12-06 17:28 ` Andreas Schwab
2006-12-06 16:13 ` Phil Endecott
2006-12-06 16:26 ` Jan Blunck
2006-12-06 17:54 ` Russell King
2006-12-06 18:05 ` David Miller
2006-12-07 9:48 ` Jan Blunck
2006-12-07 10:30 ` Andreas Schwab
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20061206140138.GA16350@slug \
--to=deweerdt@free.fr \
--cc=linux-kernel@vger.kernel.org \
--cc=phil_arcwk_endecott@chezphil.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox