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Date: Thu, 22 Jan 2004 14:31:29 -0800
From: "Edward S. Peschko" <esp5 AT pge DOT com>
To: Tomer Zekharya <tomerz AT compugen DOT co DOT il>
Cc: cygwin AT cygwin DOT com
Subject: Re: Linking VC++ apps to cygwin-based DLLs
Message-ID: <20040122223129.GB4335@mdssdev05.comp.pge.com>
References: <E19E2FC4AD37D04E9A8832D6BF1ADA42702B67 AT xmail DOT il DOT cgen DOT biz>
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On Fri, Jan 23, 2004 at 12:24:19AM +0200, Tomer Zekharya wrote:
> Hi
> 
> First I want to state that I'm using Cygwin (and VC++) for less than a week. 
> 
> I want to port a certain group of libraries from UNIX to windows. I managed to compile and link it using cygwin, but the Windows applications that needs these libs are MFC based, so I can't compile them in cygwin (at least that's what I understood from searching through the web and through the cygwin mailing list).
> I tried doing the opposite: compile the UNIX code to DLLs using cygwin, and trying to link to them in VC++, but I get all kind of errors.  After compiling the DLLs as described in the "Building DLLs" section in the Cygwin manual, I get the following message when linking in VC++: 
> 
> warning LNK4078: multiple ".text" sections found with different attributes (E0000020)
> 
> And my application crashes on some kind of memory fault. 
> 
> Since I'm new to this world of cygwin and VC++, I don't really know if I made a mistake in the cygwin side or the VC++ side. If anyone has successfully compiled MFC based applications linking against cygwin-based DLLs, I'll be more than happy to hear how he/she did it. 

You can't do this AFAIK - the binary formats are incompatible. And this does make 
migration from VC++ to cygwin difficult, IMO.

However I believe that open-source Watcom supports VC6 style DLLs, you might want 
to try using Watcom to build cygwin libs and projects. Anyone done that, BTW?

Ed

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