I'm on Snow Leopard, so I've read numerous posts on the subject of GHC and it's Snow Leopard (non-)compatibility. I've got most things working - I can do a 'cabal update' - something that gave errors before. GHC itself seems to be working fine.

I want to install the SDL package from Hackage, which I first tried doing like this:
'cabal install sdl'
which gives a bunch of warnings, all looking like this
'ld: warning: in /opt/local/lib/libSDL.dylib, file is not of required
architecture'
with 'libSDL.dylib' replaced with various *.a and *.dylib files

I then found this in a Usenet post about Snow Leopard breaking GHC:
-- Once cabal works, options --ld-option=-m32 (and also --gcc-option=- m32) may be used. These options may also be passed to "./Setup configure"

And tried this: (I think maybe my problem is that I'm not passing these flags correctly to cabal)
'cabal install sdl --ld-options="-arch i386" --gcc-option=-m32 --reinstall'
Well I get the same errors, well warnings actually.

Can I just ignore these warnings?

When compiling my small sample code:
import Prelude
import Graphics.UI.SDL as SDL

main = do
SDL.init [InitEverything]
setVideoMode 640 480 32 []

I again get the warnings:
ld: warning: in /opt/local/lib/libSDL.dylib, file is not of required
architecture
ld: warning: in /opt/local/lib/libSDLmain.a, file is not of required
architecture

and then a bunch of undefined symbols such as:
_SDL_Init
_SDL_SetClipRect

Well this post basically based on the assumption that the warnings are breaking the SDL library and thereby keeping my code from compiling - so how do I fix those warnings?

- Sorry for the long mail
Malthe