Undefined reference to

SDL Development
1

Hello list,

I’m new to SDL and I’m trying to compile a simple test program found at
http://www.libsdl.org/intro/toc.html. The code is the following.

#include <stdio.h>
#include “/usr/include/SDL/SDL.h”

int main()
{
if (SDL_Init(SDL_INIT_AUDIO | SDL_INIT_VIDEO) < 0)
{
fprintf(stderr, “Unable to init SDL: %s\n”, SDL_GetError());
exit(1);
}
atexit(SDL_Quit);
}

Is it necessary to include something else to compile this program?

tairone at cefala06:~/sdlprojects$ gcc sdltest.c -o sdltest.out

Because I’m receiving the following error message.

sdltest.c: In function ‘main’:
sdltest.c:9: warning: incompatible implicit declaration of built-in function
’exit’
/tmp/cckr9bEj.o: In function main': sdltest.c:(.text+0x22): undefined reference toSDL_Init’
sdltest.c:(.text+0x2e): undefined reference to SDL_GetError' sdltest.c:(.text+0x58): undefined reference toSDL_Quit’
collect2: ld returned 1 exit status
tairone at cefala06:~/sdlprojects$ ls
sdltest.c
(arg: 21)

I don’t what can I do to solve this problem. So any help is welcome.
Thanks,

Tairone Nunes Magalhaes

2

Hello list,

I’m new to SDL and I’m trying to compile a simple test program found at
http://www.libsdl.org/intro/toc.html. The code is the following.

#include <stdio.h>
#include “/usr/include/SDL/SDL.h”

int main()
{
if (SDL_Init(SDL_INIT_AUDIO | SDL_INIT_VIDEO) < 0)
{
fprintf(stderr, “Unable to init SDL: %s\n”,
SDL_GetError()); exit(1);
}
atexit(SDL_Quit);
}

Is it necessary to include something else to compile this program?

You need to add sdl-config --cflags --libs to the gcc command line.

Regards, Joonas.On Monday 20 February 2006 20:02, Tairone N. Magalhaes wrote:

tairone at cefala06:~/sdlprojects$ gcc sdltest.c -o sdltest.out

Because I’m receiving the following error message.

sdltest.c: In function ‘main’:
sdltest.c:9: warning: incompatible implicit declaration of built-in
function ‘exit’
/tmp/cckr9bEj.o: In function main': sdltest.c:(.text+0x22): undefined reference toSDL_Init’
sdltest.c:(.text+0x2e): undefined reference to SDL_GetError' sdltest.c:(.text+0x58): undefined reference toSDL_Quit’
collect2: ld returned 1 exit status
tairone at cefala06:~/sdlprojects$ ls
sdltest.c
(arg: 21)

I don’t what can I do to solve this problem. So any help is welcome.
Thanks,

Tairone Nunes Magalhaes

–
Joonas “dolphin” Lahtinen <@Joonas_Lahtinen>

3

Hello !

#include “/usr/include/SDL/SDL.h”

That should be “#include SDL.h”

int main() {

That needs to be :

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

CU

4

Hello !

That should be “#include SDL.h”

Sorry, my fault.

This should be :

#include “SDL.h”

CU

5

It also needs an #include <stdlib.h> for the call to atexit().On 2/20/06, Torsten Giebl wrote:

Hello !

That should be “#include SDL.h”

Sorry, my fault.

This should be :

#include “SDL.h”

CU

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–
Cheers,
Josh

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6

Tairone N. Magalhaes wrote:

#include <stdio.h>
#include “/usr/include/SDL/SDL.h”

int main()
{
if (SDL_Init(SDL_INIT_AUDIO | SDL_INIT_VIDEO) < 0)
{
fprintf(stderr, “Unable to init SDL: %s\n”, SDL_GetError());
exit(1);
}
atexit(SDL_Quit);
}

Is it necessary to include something else to compile this program?

tairone at cefala06:~/sdlprojects$ gcc sdltest.c -o sdltest.out

Yes, you need to link with the SDL library:

$ gcc -o sdstest sdltest.c -lSDL

August