create DLL with GMP routines for Windows (Excel)

[ken72cc-a at yahoo.com]

Hi,

My goal is to create a DLL using GMP routines that can be called from Excel.  I'm using minGW and gcc (C) with Code Blocks IDE.  I can successfully create a DLL (using __stdcall and .def file) that can be called from Excel.  I can also successfully create a console application that uses GMP routines (using linker option -lgmp).  Where I have a problem is trying to create a DLL for Excel that includes GMP routines.  The DLL gets created with no error but for some reason, none of the functions appear to be exported to the DLL - I get a 'Runtime error 53, File not found' error in Excel when trying to use any of the DLL functions, even if the functions don't call GMP routines.  The error suggests the DLL can't be found.  If I comment out any function calling GMP routines and re-create the DLL, everything works fine in Excel.

Any suggestions as to what I'm not doing correctly?  Thanks