Re: Any pointer to Byte Alignment & Structure Padding?

["Amit Dang" <amit_dang@intersolutions.stpn.soft.net>]

Hi Vadiraj,
    Thanks for the reply. So any idea about how structure should be defined
in case it is to be used by a text file editor which works on both linux &
solaris.

Regards,
Amit Dang
----- Original Message ----- 
From: "Vadiraj" <vadiraj.cs@gmail.com>
To: "Glynn Clements" <glynn@gclements.plus.com>
Cc: "linux-c-programming" <linux-c-programming@vger.kernel.org>
Sent: Tuesday, August 02, 2005 4:51 PM
Subject: Re: Any pointer to Byte Alignment & Structure Padding?


> On 8/2/05, Glynn Clements <glynn@gclements.plus.com> wrote:
> >
> > Vadiraj wrote:
> >
> > > >    Can any body provide some light on Byte Alignment & Structure
Padding
> > > > for gcc linux x86 32-bit?
> > >
> > >  The system expects the address of a variable to be multiple of
> > > its size. Meaning for 32 bit x86 int being 4 bytes. The address
> > > location of a int variable is expected to be at multiple of 4.
> > > ex 0 4 8 12 16. if  its double then its expected it to be multiple of
8.
> > > 0 8 16 ...
> >
> > Incorrect; 8-byte quantities (double and long long) are only 4-byte
> > aligned, not 8-byte aligned.
>
>  Depends on compiler and architecture. With GCC 3.3.3 on cygwin I get
> 24 bytes for the same structe and also in Solaris system too.
> meaning 8 byte alligned.
>
> True that Gcc 2.9 on linux is 4 byte alligned.
>
>
> -- 
> cheers,
> Vadi
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