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Message-ID: <392788F8.6259199B@village.uunet.be>
Date: Sun, 21 May 2000 08:58:00 +0200
From: J D L <De_Laender-De_Winter AT village DOT uunet DOT be>
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To: "cygwin AT sourceware DOT cygnus DOT com" <cygwin AT sourceware DOT cygnus DOT com>
CC: earnie_boyd AT yahoo DOT com
Subject: Re: Re: DLL's ; Import libs ; def files etc ..
References: <20000520202210 DOT 10082 DOT qmail AT web125 DOT yahoomail DOT com> <392777C0 DOT 1FDD804F AT village DOT uunet DOT be>
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J D L wrote:
> 
> Earnie Boyd wrote:
> >
> > --- J D L <De_Laender-De_Winter AT village DOT uunet DOT be> wrote:
> > -8<-
> > > I have a database program, distributed as an DLL.
> > > The distribution contains also import libraries for
> > > the Borland compiler and the Microsoft compiler.
> > > On top of that it even contains a .DEF file, however with
> > > following constructs in it :
> > >
> > > EXPORTS
> > >     _SQLAllocConnect AT 8
> > >     _SQLAllocConnect = _SQLAllocConnect AT 8
> > >
> > > I created a 'cygnus' def file with the usual manipulations out of
> > > the FAQ.
> > >
> > -8<-
> >
> > Why didn't you use the supplied .def file to create the import library???  By
> > creating your own you missed the aliases that were in the supplied .DEF file
> > that caused your problems.
> >
> 
> I hoped it was that simple ...
> 
> Apart from stopping on some syntax errors before the 'EXPORTS' section
> (that I corrected by removing most lines before EXPORTS) :
> 
> 1) If I keep only the SQLAllocConnect AT 8 then linking goes OK, but
> at runtime : linked against not existing SQLAllocConnect AT 8
> 2) If I keep only SQLAllocConnect, then linking fails ...
> 3) If I keep the whole stuff, then the same as 1.
> 
> My (restricted knowledge) is :
> 
> 1) the object code calls _SQLAllocConnect AT 8 (just by construct :
> function f -> _f AT stacksize)
> 
> 2) The import library MUST have this function in it. So in my case
> _SQLAllocConnect AT 8 must be in the import
> 
> 3) The DLL expects _SQLAllocConnect as function call, which
> is proven by my manipulation via assembly. Changing the _f@ by _f
> does really the job !
> 
> 4) Somewhere the equivalence between both should be declared
> but how and where in cygnus' environment ???? The .DEF file ???
> 
> Thanks for all explanation/help !
> 
> Jos

	Hi,

Finally, I found the answers surfing around through FAQ's ...
(I knew ;-) )

The answer :

dlltool ... -k does the job of importing _f...@.. and exporting _f...
which is exactly what I need here.

The place to find : 

mingw (FAQ) (they have their domain : www.mingw.org)
-> Story about linking with dll's that
then points further to Colin Peters pages on which the
answer is explained.

Maybe an idea to bring it a bit closer in the cygwin faq ?
(or did I just miss ?)

Best regards,

Jos

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