Re: [Vala] undefined reference to 'SDL_Init' and/or 'WinMain 16' (under Windows)

[Joseph Montanez <jmontanez gorilla3d com>]

Sorry I am just now getting to this, but here is my work to get SDL +
Opengl in vala working on windows:
https://github.com/gorilla3d/Hi-Panda/blob/master/Makefile

It was a painful process. You don't need a main or winmain functions
at all. I ended up side loading cygwin, and visual studio libraries
(for opengl). Hopefully that helps enough. I also packaged the
libraries I ended up using with vala-0.12
http://files.myopera.com/sutabi/vala_game_sdk/vala-0.12.0.zip that may
also help.

On Tue, Mar 20, 2012 at 6:27 AM,  <Raum no-log org> wrote:
> Really strange...
>
> This code below is correct and a window appears !
> ==================================
> using GLib;
> using SDL;
>
> int WinMain(string[] argc)
> {
>        SDL.Surface *screen;
>
>    if( SDL.init( InitFlag.VIDEO ) < 0 )
>    {
>        stdout.printf( "Impossible d'initialiser SDL:  %s\n",
> SDL.get_error( ) );
>        return 1;
>    }
>
>
>    screen = SDL.Screen.set_video_mode( 640, 480, 16,
> SurfaceFlag.HWSURFACE );
>        SDL.WindowManager.set_caption ("Vala SDL Demo", "");
>
>    if( screen == null )
>    {
>        stdout.printf( "Impossible d'initialiser le mode video: %s\n",
> SDL.get_error( ) );
>        return 1;
>    }
>
>    SDL.Timer.delay( 3000 );
>    SDL.quit();
>    return 0;
> }
>
>
> int main(string[] argc )
> {
>                stdout.printf ("not printed\n");
>
>                return 0;
> }
> =========================================
>
> The "main" function is not called and I've got two warnings :
> Compilation time :
> test2.vala:5.1-5.11: warning: method `WinMain' never used
> int WinMain(string[] argc)
>
> Linking time :
> Warning: resolving _WinMain 16 by linking to _WinMain
>
> I need to have these two function "main" and "winmain"... :-?
>
> Ehm...
>
> Thanks
>
>
> > Hi
> > WinMain usually is the entry point for Win32 programs (isntead of
> > main()). If you do not have such a function defined in your C-Code you
> > get the
> > the error message you described. At least that's the experience I have
> > with that error message with pure C an WinAPI
> >
> > regards
> > andi
> >
> >
> >
> > Am 20.03.2012 12:06, schrieb Raum no-log org:
> > > Ehm.. I don't have any idea or any clue....
> > >
> > > I've tried to create C code and compile it :
> > > -----------------------------------------------------
> > > /* test2.c generated by valac 0.12.0, the Vala compiler
> > >   * generated from test2.vala, do not modify */
> > > #include<glib.h>
> > > #include<glib-object.h>
> > > #include<stdlib.h>
> > > #include<string.h>
> > > #include<SDL.h>
> > > #include<stdio.h>
> > >
> > > gint _vala_main (gchar** argc, int argc_length1);
> > >
> > > gint _vala_main (gchar** argc, int argc_length1) {
> > >      gint result = 0;
> > >      SDL_Init ((guint32) 0);
> > >      SDL_Quit ();
> > >      fprintf (stdout, "Hello world!");
> > >      result = 0;
> > >      return result;
> > > }
> > >
> > > int main (int argc, char ** argv) {
> > >      g_type_init ();
> > >      return _vala_main (argv, argc);
> > > }
> > > -------------------------------------------------
> > >
> > > And I've got the same error (which is not surprising...) :
> > > gcc -o C:/vala\test2 C:/vala/test2.vala.c -mms-bitfields
> > > -Ic:/vala/include/glib-2.0 -Ic:/vala/lib/glib-2.0/include  -Lc:/vala/lib
> > > -lgobject-2.0 -lgthread-2.0 -lglib-2.0 -lintl -lSDL -lSDLmain -lmingw32
> > > -mwindows
> > > c:/vala/lib/libmingw32.a(main.o):main.c:(.text+0xbd): undefined
> > > reference
> > > to `WinMain 16'
> > > collect2: ld returned 1 exit status
> > >
> > >
> > > > Hello,
> > > >
> > > > 2012/3/20<Raum no-log org>:
> > > > > Perhaps a basic linkage error but I dont know how to correct :D
> > > > You should be looking at the SDL FAQ for Windows:
> > > > http://wiki.libsdl.org/moin.cgi/FAQWindows
> > > >
> > > > For example this question seems to be exactly what you want (don't
> > > > forget -X before each argument):
> > > >
> > > > I get "Undefined reference to 'WinMain 16'"
> > > > Under Visual C++, you need to link with SDLmain.lib. Under the gcc
> > > > build environments including Dev-C++, you need to link with the output
> > > > of "sdl-config --libs", which is usually: -lmingw32 -lSDLmain -lSDL
> > > > -mwindows
> > > _______________________________________________
> > > vala-list mailing list
> > > vala-list gnome org
> > > http://mail.gnome.org/mailman/listinfo/vala-list
>
> _______________________________________________
> vala-list mailing list
> vala-list gnome org
> http://mail.gnome.org/mailman/listinfo/vala-list



-- 
Joseph Montanez
Web Developer
Gorilla3D
Design, Develop, Deploy