linking on Windows

[akaposi]

When I tried to compile a Haskell package importing repa-devil on Windows it gave linking errors complaining about undefined references to IL functions such as:

 Linking dist\build\test\test.exe ...
 dist\build\shapes\test-tmp\Main.o:fake:(.text+0x71900): undefined reference to `ilInit'
 dist\build\shapes\test-tmp\Main.o:fake:(.text+0x71910): undefined reference to `ilOriginFunc'

I was able to fix it by replacing all foreign import ccall calling conventions by stdcall, eg.

 foreign import ccall unsafe "ilInit" ilInitC :: IO ()

by

 foreign import stdcall unsafe "ilInit" ilInitC :: IO ()

After reinstalling such a modified repa-devil I can read and write PNG images etc.

This is my setup:

• Windows7 64 bit
• Haskell Platform (comes with MinGW)
• install MSys and MSysDTK as described in http://blog.johantibell.com/2011/01/setting-up-haskell-development.html
• install nasm using its Windows installer
• install zlib, libpng, libjpeg-turbo and then devil from source

A small Haskell program which triggers the error:

module Main where

import Data.Array.Repa.IO.DevIL

main = runIL $ do
  (RGB im) <- readImage "blah.png"
  return ()