This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: structure members of packed structures

From: Dale Johannesen <dalej at apple dot com>
To: Mark Mitchell <mark at codesourcery dot com>
Cc: Dale Johannesen <dalej at apple dot com>, Nathan Sidwell <nathan at codesourcery dot com>, gcc at gcc dot gnu dot org
Date: Mon, 14 Jul 2003 14:50:00 -0700
Subject: Re: structure members of packed structures

On Monday, July 14, 2003, at 02:39 PM, Mark Mitchell wrote:

On Mon, 2003-07-14 at 08:58, Nathan Sidwell wrote:
Given,

struct Unpacked { int i; };
struct  __attribute__ ((packed)) Packed
{
   char c;
   Unpacked u;
};
where should 'u' be placed? Our current behavour is to pack it so that
Unpacked's members are unaligned.
options 1) continue this behaviour, but prevent taking references/address of u or any of its members.


Contingent on STRICT_ALIGNMENT, please.  Unaligned accesses are not
a problem on all architectures.

Follow-Ups:
- Re: structure members of packed structures
  - From: Richard Henderson

References:
- Re: structure members of packed structures
  - From: Mark Mitchell

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]