Compiling a shared (DLL) library with stack

[nect...@gmail.com]

Hello all,

first of all - my thanks to the developers of stack! We use it daily and it has really made a world of difference in Haskell usability. Well done & much appreciated!


LONG VERSION:
I have a commandline Haskell program that now requires a GUI. This should ideally run on Windows as we are controlling equipment that does not have drivers for linux (an automated microscope).

I once wrote a Haskell GUI program using wxHaskell, but found that I ended up with spaghetti code. Perhaps I was doing it all wrong, but I have little desire to repeat that. But at the same time I don't want to duplicate the functionality of the Haskell code.

I was thinking of writing a GUI in C++/Qt, which I know well. Ideally, the C++ code would be limited to the GUI, and I would call into my Haskell code using the FFI. That would be rather painless if I could compile the Haskell code to a DLL callable as if it was a C library. Then it seems as if I could just call hs_init on application startup and hs_exit on shutdown, and everything is set.

I have tried to Google this, but I seem to have found only scattered reports. It's not even clear to me if it is possible at all. But in any case I would very much like to stick with stack!


SHORT VERSION:
Is there a way to easily generate a Haskell DLL from Windows using a stack project? I am really hoping that stack can do the hard work for me, all the way to generating the header file and the dll itself. Would it make a difference if were running this on Linux?

If not, is this on the developer's radar somehow?

Perhaps there is another way to solve this? Suggestions welcome!

Thanks!
Peter

[Michael Snoyman]

I can only speak for myself here, but generating Windows DLLs is simply uncharted waters (whether with or without Stack). I'm not sure if anyone else has given this a shot before either.

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[Neil Mitchell]

I figured it out and wrote section 13.6.2 of the user manual asof GHC
7.6: https://downloads.haskell.org/~ghc/7.6.1/docs/html/users_guide/win32-dlls.html

No idea if it still works, but no reason to suspect it doesn't.
Certainly it worked robustly at the time.

Thanks, Neil

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