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Re: B19: -fpack-struct dows not work
- To: Sergey Udaltsov <svu at mcr dot spb dot ru>
- Subject: Re: B19: -fpack-struct dows not work
- From: Jean-Francois Morcillo <jojo at esil dot univ-mrs dot fr>
- Date: Fri, 3 Jul 1998 06:53:57 +0200 (MET DST)
- cc: gnu-win32 at cygnus dot com
On Thu, 2 Jul 1998, Sergey Udaltsov wrote:
> Dear sirs:
>
> We've tryed to compile the following lines using gcc:
>
> struct s
> {
> char c;
> long l;
> };
I think it's right because of memory alignement. Normaly long are place at
memory address multiple of 4. So there is a hole of 3 bytes between c and
l in memory. May be with the paked attribute the compiler does'nt do the
same alignements?
> > using option -fpack-struct.
> sizeof (s) returned 8. Is it right?
>
> When I added __attribute__ ((packed)), sizeof(s) became 5.
> So, for now the command-line option does not work the same way as struct
> attribute.
>
> Platform: CYGWIN32 B19 / NT4.0
>
> Best regards,
>
> Sergey V. Udaltsov
>
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