[Haskell-cafe] sdl-mixer loading issue

[Don Stewart]

wojtowicz.norbert:
> Hello,
> 
> I am trying to use the SDL-mixer bindings to play wav files. I've hit
> a wierd error and I can't figure out how to solve it:
> 
> Prelude> import Graphics.UI.SDL.Mixer.Music
> Prelude Graphics.UI.SDL.Mixer.Music> loadMUS "test.wav"
> Loading package SDL-0.5.4 ... linking ... done.
> Loading package SDL-mixer-0.5.2 ... linking ... <interactive>:
> /home/norbert/bin/lib/SDL-mixer-0.5.2/ghc-6.8.2/HSSDL-mixer-0.5.2.o:
> unknown symbol `Mix_LoadWAV'
> ghc-6.8.2: unable to load package `SDL-mixer-0.5.2'
> 
> I've looked up the source code; Mix_LoadWAV seems to be #defined, so I
> suspect it's some kind of library path issue but I don't grok the
> whole system well enough to figure it out; maybe someone could point
> me in the right direction?
> 
> Have the issue now on Ubuntu 8.04 and previously had the same issue
> when I tested it on a FreeBSD box. I did install all of the
> "libsdl-*-dev" in the Ubuntu repo.

Ah, well spotted. I get the same issue on Arch, in ghci:

    Prelude> import Graphics.UI.SDL.Mixer.Music
    Prelude Graphics.UI.SDL.Mixer.Music> loadMUS
    "/usr/share/hback-0.0.3/sounds/t.wav"
    <interactive>: /usr/lib/SDL-mixer-0.5.2/ghc-6.8.2/HSSDL-mixer-0.5.2.o:
    unknown symbol `Mix_LoadWAV'
    ghc-6.8.2: unable to load package `SDL-mixer-0.5.2'

Looking in the source we see:

    foreign import ccall unsafe "Mix_LoadWAV"
        mixLoadWAV :: CString -> IO (Ptr ChunkStruct)
         
Lemmih, any ideas? -lSDL and -lSDL_mixer seem to be there.

-- Don