Gph Sdk Linker Error

[Girvo]

Hi there.

I went and got the SDK from the GPH website, and extracted it no sweat. I fired it up, created a standard template project, and proceeded to compile it. It worked fine for windows, it ran and everything.

But, as soon as I changed the compiler options from win to gp2x, it stopped linking.

[Linker error] undefined reference to `WinMain@16'

Was the error I got. Any ideas?

-Girvo

 

[GP2X_Coder]

Hi there.

I went and got the SDK from the GPH website, and extracted it no sweat. I fired it up, created a standard template project, and proceeded to compile it. It worked fine for windows, it ran and everything.

But, as soon as I changed the compiler options from win to gp2x, it stopped linking.

[Linker error] undefined reference to `WinMain@16'

Was the error I got. Any ideas?

-Girvo

Sounds like you are including the window.h header when you compile for the gp2x just use ifdef WIN32 include all windows stuff endif etc... this should fix your problem.

 

[Girvo]

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <SDL.h>

/* GP2X button mapping */
enum MAP_KEY
{
	VK_UP		 , // 0
	VK_UP_LEFT	, // 1
	VK_LEFT	   , // 2
	VK_DOWN_LEFT  , // 3
	VK_DOWN	   , // 4
	VK_DOWN_RIGHT , // 5
	VK_RIGHT	  , // 6
	VK_UP_RIGHT   , // 7
	VK_START	  , // 8
	VK_SELECT	 , // 9
	VK_FL		 , // 10
	VK_FR		 , // 11
	VK_FA		 , // 12
	VK_FB		 , // 13
	VK_FX		 , // 14
	VK_FY		 , // 15
	VK_VOL_UP	 , // 16
	VK_VOL_DOWN   , // 17
	VK_TAT		  // 18
};

/* The screen surface, joystick device */
SDL_Surface *screen = NULL;
SDL_Joystick *joy = NULL;

void Terminate(void)
{
	SDL_Quit();
#ifdef GP2X
	chdir("/usr/gp2x");
	execl("/usr/gp2x/gp2xmenu", "/usr/gp2x/gp2xmenu", NULL);
#endif
}

int main (int argc, char *argv[])
{
	int done;

	/* Initialize SDL */
	if (SDL_Init (SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_JOYSTICK) < 0) {
		fprintf (stderr, "Couldn't initialize SDL: %s\n", SDL_GetError ());
		exit (1);
	}
	atexit (Terminate);

	SDL_ShowCursor(SDL_DISABLE);

	/* Set 320x240 16-bits video mode */
	screen = SDL_SetVideoMode (320, 240, 16, SDL_SWSURFACE);
	if (screen == NULL) {
		fprintf (stderr, "Couldn't set 320x240x16 video mode: %s\n", SDL_GetError ());
		exit (2);
	}

	/* Check and open joystick device */
	if (SDL_NumJoysticks() > 0) {
		joy = SDL_JoystickOpen(0);
		if(!joy) {
			fprintf (stderr, "Couldn't open joystick 0: %s\n", SDL_GetError ());
		}
	}

#ifdef GP2X
	/* Only use GP2X code here */
#endif

#ifdef WIN32
	/* Only use Windows code here */
#endif

	done = 0;
	while (!done)
	{
		SDL_Event event;

		/* Check for events */
		while (SDL_PollEvent (&event))
		{
			switch (event.type)
			{
				case SDL_KEYDOWN:
					/* if press Ctrl + C, terminate program */
					if ( (event.key.keysym.sym == SDLK_c) && (event.key.keysym.mod & (KMOD_LCTRL | KMOD_RCTRL)) )
						done = 1;
					break;
				case SDL_KEYUP:
					break;
				case SDL_JOYBUTTONDOWN:
					/* if press Start button, terminate program */
					if ( event.jbutton.button == VK_START )
						done = 1;
					break;
				case SDL_JOYBUTTONUP:
					break;
				case SDL_QUIT:
					done = 1;
					break;
				default:
					break;
			}
		}

		/* Processing */
	}

	return 0;
}

Its just the standard template, but it won't compile. What needs to be changed?

 

[Nmn]

Nothing should need change... sometimes you may accidentally screw something up by doing something you are sure has no effect but somehow does.

So you could try to re-extract it and such.

But if that doesn't work, after changing to gp2x mode, try pressing the Rebuild All button, next to the Build And Run button.

Hope this helps.