[jhc] jhc and sdl

[Korcan Hussein]

You need to specify the haskell libraries you're going to use, and also typically for FFI bindings you'll need get jhc to tell the c compiler which c library to link to, so to compile your example would be:

jhc -p SDL test.hs -o test --optc='-lSDL'

If you use another package as well say SDL-image then it would be:

jhc -p SDL -p SDL-image test.hs -o test --optc='-lSDL' --optc='-lSDL_image'

I also noticed a minor problem with the code, some kind of ambiguity with main, it wouldn't compile without stating the type of main, e.g:

module Main where

import Graphics.UI.SDL.Version

main :: IO ()
main = return ()

________________________________
> Date: Sat, 7 Aug 2010 19:37:06 +0200
> From: csaba.hruska at gmail.com
> To: jhc at haskell.org
> Subject: [jhc] jhc and sdl
>
> Hi!
>
> I've a problem with jhc 0.7.6.
> I've compiled and installed (jhc modded) sdl succesfully but for even
> this simple example code fails to compile:
>
> import Graphics.UI.SDL.Version -- Graphics.UI.SDL is not exported
> main = return ()
>
> here is the output:
>
> bash-3.2$ jhc test.hs
> jhc test.hs
> jhc 0.7.6 (0.7.6-3)
> Finding Dependencies...
> Using Ho Cache: '/Users/hruskacsaba/.jhc/cache'
> Main [test.hs]
> Error: Module not found: Graphics.UI.SDL.Version
>
> jhc knows about sdl:
> bash-3.2$ jhc --list-libraries
> - SDL-0.6.2
> - xhtml-3000.2.0.1
> - HUnit-1.2.2.1
> - parsec-2.1.0.1
> - applicative-1.0
> - QuickCheck-1.2.0.0
> - Diff-0.1.2
> - haskell98-1.0
> - base-1.0
> - smallcheck-0.4
> - containers-0.3.0.0
> - pretty-1.0.1.1
> - utility-ht-0.0.5.1
> - html-1.0.1.2
> - jhc-1.0
> - flat-foreign-1.0
> - safe-0.2
>
> the hl file is placed in ~/lib/jhc
> bash-3.2$ ls -l ~/lib/jhc
> total 424
> -rw-r--r-- 1 hruskacsaba staff 216003 Aug 7 18:14 SDL-0.6.2.hl
>
> So, do you have any idea what's the problem?
>
> Cheers,
> Csaba Hruska
>
>
>
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