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Subject:	Re: Problems using a DLL with Cygwin 64 bit
References:	<567413F7 DOT 8070904 AT observatorysciences DOT co DOT uk>
To:	cygwin AT cygwin DOT com
From:	Eliot Moss <moss AT cs DOT umass DOT edu>
Message-ID:	<56741B41.2090201@cs.umass.edu>
Date:	Fri, 18 Dec 2015 09:42:09 -0500
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On 12/18/2015 9:11 AM, Philip Taylor wrote:
>
> Thank you for the reply. My situation is this: I was supplied Windows 32-bit and 64-bit .dll and
> .lib files by the manufacturer, which I believe were created using MS Visual Studio. These are to
> enable me to use the API for this camera from my software.
>
> Building using GCC tools with cygwin, my initial attempt at linking with this API library failed
> with the message : "error adding symbols: File in wrong format.".
>
> I then discovered that by creating and using a new .lib file for this API DLL, using the pexports
> and dlltools utilities, I could get the link to succeed.
>
> Then (under 64 bit Cygwin) I got the message "*** fatal error - cygheap base mismatch detected".
>
> What exactly did you mean by "You're not trying to load the Cygwin DLL at runtime dynamically?". I
> am trying to build this application under Cygwin in the same way as many others, which all run OK,

If you have a Windows native DLL, you might do better using MinGW and its tools rather than Cygwin,
though Cygwin experts may be able to clarify this point.

Regards -- Eliot Moss

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