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Message-ID:	<3BC52EEA.3050003@ece.gatech.edu>
Date:	Thu, 11 Oct 2001 01:32:26 -0400
From:	Charles Wilson <cwilson AT ece DOT gatech DOT edu>
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To:	Mark Mims <MMims AT aegistg DOT com>
CC:	"'cygwin AT cygwin DOT com'" <cygwin AT cygwin DOT com>
Subject:	Re: Problem calling a cygwin-built-DLL from a MSVC-built-app
References:	<9B6DCB223668D311BFB900105AD046DD88862A AT viper DOT aegis DOT com>

Mark Mims wrote:

> I'm trying to call a cygwin-built DLL from a MSVC-6.0-built app.
> 
> First question, Is this even possible?  Mumit Khan's dllhelper page has some
> example DLLs that are supposed to be callable from an excel spreadsheet...
> which seems to imply that what I'm trying to do has been done before.
> However, I haven't even been able to get the excel examples to work.  I have
> downloaded the dllhelpers (both 2.2.5 and 2.2.9),


Mumit's "dllhelpers" package never got beyond version 0.2.5.  I have no 
idea where "2.2.5" and "2.2.9" came from.

> and the examples work fine
> for a cywin app calling a cygwin DLL or a vc6 app calling a vc6 DLL, but no
> luck on trying to mix.
> 
> I've found quite a mess of stuff on building cygwin and mingw DLLs from
> Google, but nothing so far seems to work.  I have noticed that things seem
> to have changed considerably when dllwrap was introduced.  
> 
> Can anybody point to examples and/or docs for recent versions of the tools?
> I'm now thinking (grasping) I might just be having versioning problems,
> where I'm trying to use techniques that only worked with older versions of
> gcc, dlltool, dllwrap, etc (?).


The most recent version of dllhelpers (updated to correspond to the 
latest tools) is here:
http://www.neuro.gatech.edu/users/cwilson/cygutils/V1.1/dll-stuff/

However, there's nothing there about calling the DLL from Excel.  I know 
nothing about *that* particular problem.  Note that recent dllhelpers 
(and new binutils) take advantage of special GNU-ld.exe tricks for 
building "auto-import" DLLs.  You'll have to do it the "medium-old" way 
  -- say, dllhelpers-0.2.6 ? -- if you want MSVC and/or MSExcel to 
understand it.  I think.

--Chuck


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