Problems using a DLL with Cygwin 64 bit

Eliot Moss
Fri Dec 18 14:42:00 GMT 2015

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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