Create a dll for windows with gcc

hello!
I have made a program in 'C' under linux and i want to make it into a dll with gcc to use it in labview under windows.
Has anyone already done a such thing? so what is the magic option to pass to gcc to make it properly?
Thank you.

vincent72 wrote:
Thank you for your replies. unfortunately, these options don't work on our computer. the keyword 'declspec' wasn't reconnised by our gcc. we also tried the keyword '__attribute ((dllexport))__' but it didn't work anymore.
I think the standard gcc attribute is more
something like attribute(export). After all gcc environments typically
use shared libraries and not DLLs. But then again not every gcc
compiler will be able to just create proper Win32 executables. As
explained already, there needs to be quite a lot in the toolchain for
the intended target.
For instance the compiler/linker should support COFF library format in
order to create a valid Win32 executable file unless you have a your
own format specific Win32 compatible loader that gets linked in and
understands your library format. Also declspec() is a Microsoft
specific extension not supported by off the shelf gcc. And gcc has no
intentions to add anything they consider non-standard, and most
Microsoft extensions are non-standard.
MingW does come with a patched gcc, that supports the most important
things to be able to create valid Win32 executables but most other gcc
versions don't.
Rolf Kalbermatter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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