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