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From: Rugxulo <rugxulo AT gmail DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: -fpack-struct causes iostream to error. -O3 makes it worse.
Date: Mon, 9 Mar 2009 00:02:44 -0700 (PDT)
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

Hi,

On Mar 8, 11:33=A0pm, Jim Michaels <jmich DOT  DOT  DOT  AT yahoo DOT com> wrote:
> thought people should know about this. =A0this affects iostream,
> fstream, ostream, istream, ios.all things related.
> I have not had any problems with vector or any of the STL. =A0The STL
> seems to be unaffected.
> Jim Michaels

Try this:

http://gcc.gnu.org/onlinedocs/gcc-4.3.3/gcc/Variable-Attributes.html#index-=
g_t_0040code_007bpacked_007d-attribute-2215

"
packed
    The packed attribute specifies that a variable or structure field
should have the smallest possible alignment=97one byte for a variable,
and one bit for a field, unless you specify a larger value with the
aligned attribute.

    Here is a structure in which the field x is packed, so that it
immediately follows a:

              struct foo
              {
                char a;
                int x[2] __attribute__ ((packed));
              };
"