[Haskell-cafe] SDL program under MinGW

[sam lee]

I can compile http://darcs.haskell.org/~lemmih/hsSDL/hssdl/Examples/MacOSX/Test.hs

But I can't find the "small Cabal file" and c_main.c .
Does anyone have those files? I want to try if Test.hs links well on
windows platform.

> I think the binding needs to not include SDLMain and instead do the
initialization itself; see the rest of that FAQ question.

I can't grep for SDLMain in the binding. How should I modify the
binding code to use WinMain + proper initialization?

Thanks.
Sam.

On Sat, Dec 6, 2008 at 5:19 PM, Ryan Ingram <ryani.spam at gmail.com> wrote:
> From the link you provided
> (http://www.libsdl.org/faq.php?action=listentries&category=4#48)
>
>> Q:    I get "Undefined reference to 'SDL_main'" ...
>> A:    Make sure that you are declaring main() as:
>>
>> #include "SDL.h"
>>
>> int main(int argc, char *argv[])
>
> In particular notice that they want you to include SDL.h.  I suspect
> they are doing something scary like
>
>> #define main(ac, av) SDL_Main(ac, av, maybe some other args)
>
> The problem is that the library itself is defining WinMain, so you've
> got a fight between the Haskell compiler (which wants to define the
> entry point for your program to start up the runtime), and the SDL
> library (which is trying to be "helpful" and failing).
>
> I think the binding needs to not include SDLMain and instead do the
> initialization itself; see the rest of that FAQ question.
>
> In fact, the "MACOSX" readme file in the Haskell SDL binding talks
> about exactly this problem.
>
>  -- ryan
>
> On Sat, Dec 6, 2008 at 2:05 PM, sam lee <skynare at gmail.com> wrote:
>> Hi.
>>
>> I am using Windows Vista.
>> I installed the following:
>>
>> - ghc 6.8.3 (using official Windows binary installer)
>> - MinGW (from http://nuwen.net/mingw.html)
>> - SDL binding (from
>> http://hackage.haskell.org/cgi-bin/hackage-scripts/package/SDL)
>>
>> I am trying to compile the following program:
>>
>>    module Main where
>>
>>    import qualified Graphics.UI.SDL as SDL
>>
>>    main = do
>>        SDL.init [SDL.InitEverything]
>>        SDL.quit
>>
>> I get the following error:
>>
>> C:\Users\client\code\sandbox>ghc --make Example.hs
>> Linking Example.exe ...
>> C:\MinGW\lib/libSDLmain.a(SDL_win32_main.o)(.text+0x409):SDL_win32_main.c:
>> undefined reference to `SDL_main'
>>
>> According to SDL faq
>> (http://www.libsdl.org/faq.php?action=listentries&category=4#48)  I
>> should use "int main(int argc, char *argv[])", not "int main()" nor
>> "WinMain()".
>>
>> Can anyone compile the above snippet on windows machine?
>> I am using SDL library that is shipped with MinGW distribution that I'm using.
>> I also recompiled SDL haskell binding with official SDL windows binary
>> (http://www.libsdl.org/release/SDL-devel-1.2.13-mingw32.tar.gz). But I
>> get the same undefined reference to SDL_main linker error.
>>
>> Do I need to have specific main IO action so that SDL would work in Haskell?
>>
>> Thank you.
>> Sam.
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>