From:	rpolzer AT www42 DOT t-offline DOT de (echo 'Rudolf Polzer'>/dev/null)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: MINGW vs DJGPP
References:	<3ADDD586 DOT 15573 DOT EE76FB AT localhost> <3ADDEDDC DOT 30481 DOT 14D88F5 AT localhost>
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X-realname:	pavenis AT lanet DOT lv
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Date:	Wed, 18 Apr 2001 20:32:15 +0200
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pavenis AT lanet DOT lv <pavenis AT lanet DOT lv> wrote:
> On 18 Apr 2001, at 18:05, Eli Zaretskii wrote:
> > 
> > On Wed, 18 Apr 2001 pavenis AT lanet DOT lv wrote:
> > 
> > > > > Compiler           switch          reported size of struct vp
> > > > > djgpp gcc 2.95.2   -fpack-struct   80 eighty
> > > > > djgpp gcc 2.95.3   -fpack-struct   79 seventynine
> > > > > mingw gcc 2.95.2   -fpack-struct   79 seventynine
> > > > > djgpp gcc 2.95.2                   80 eighty
> > > > > djgpp gcc 2.95.3                   80 eighty
> > > > > mingw gcc 2.95.2                   88 eightyeight
> > > > > 
> > > > > when manually added, the sum of the sizes of the struct members is _79_
> > > > 
> > > > So it looks like -fpack-struct does work, at least in 2.95.3.
> > > 
> > > With my test case I'm getting following results:
> > > 
> > > DJGPP port of gcc-2.95.3 : doen't work
> > 
> > This is _really_ strange: how come the same binary yields different 
> > results?  Does the bug depend on the struct layout perhaps?
> > 
> > I also don't understand why are there differences between MinGW, DJGPP, 
> > and GNU/Linux for the same GCC version: these all target the same 
> > processor, so the alignment of struct fields should be the same, no?
> 
> Well it seems to work with C but not with C++ (I tested C++ first). The 
> same under Linux.
> 
> For MINGW and with gcc-3.0 prerelease -fpack-struct works both for 
> C and C++

What happens if you declare and define the structure as extern "C"? 
Does that work?

extern "C" struct TEST
{
 // ...
};

or

extern "C"
{
 struct TEST
 {
  // ...
 };
}

???

-- 
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eval($0=q{$0="\neval(\$0=q{$0});\n";for(<*.pl>){open X,">>$_";print X
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