Beginner Compilation Errors

SDL Development
1

Hi all,

I’m unable to compile the simplest SDL program. I’ve provided the program
and gcc output below (I’m using RHL7.1).
Any help will be great.

Thanks
Russ.=================================
Program:

[root at localhost sdl_first]# cat sdltest.c

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

int main () {
printf(“Initializing SDL…\n”)

if ((SDL_Init(SDL_INIT_VIDEO) < 0)) {
printf(“Could not initialize SDL.\n”);
exit(1);
}
printf(“SDL initialized.\n”);

exit(0);
}
[root at localhost sdl_first]#

==================================
Result:

[root at localhost sdl_first]# gcc -Wall -c sdltest.c -o sdltest.o
[root at localhost sdl_first]#

[root at localhost sdl_first]# gcc sdltest.o -o sdltest -L/usr/lib -lSDL
/usr/lib/libSDL.so: undefined reference to pthread_create' /usr/lib/libSDL.so: undefined reference topthread_cancel’
/usr/lib/libSDL.so: undefined reference to sem_destroy' /usr/lib/libSDL.so: undefined reference tosem_wait’
/usr/lib/libSDL.so: undefined reference to sem_post' /usr/lib/libSDL.so: undefined reference topthread_mutexattr_setkind_np’
/usr/lib/libSDL.so: undefined reference to sem_init' /usr/lib/libSDL.so: undefined reference topthread_sigmask’
/usr/lib/libSDL.so: undefined reference to sem_trywait' /usr/lib/libSDL.so: undefined reference topthread_mutexattr_init’
/usr/lib/libSDL.so: undefined reference to sem_getvalue' /usr/lib/libSDL.so: undefined reference topthread_join’
/usr/lib/libSDL.so: undefined reference to `pthread_cond_timedwait’
collect2: ld returned 1 exit status
[root at localhost sdl_first]#

2

I’m unable to compile the simplest SDL program. I’ve provided the
program and gcc output below (I’m using RHL7.1). Any help will be
great.

[…]

Take a look at the output of ‘sdl-config --libs’ to get an idea of
which other libraries need to be linked in. Alternatively, you can
simply use sdl-config. (gcc sdl-config --libs --cflags …)On 27 May 2001 07:07:52 -0700, russmack at mweb.co.za wrote:

–

christian zander paranoia, n.: a healthy understanding
zander at hdz.uni-dortmund.de of the way the universe works.

3

Russel MacKenzie wrote:

Hi all,

I’m unable to compile the simplest SDL program. I’ve provided the program
and gcc output below (I’m using RHL7.1).
Any help will be great.

Thanks
Russ.

/snip/

[root at localhost sdl_first]# gcc -Wall -c sdltest.c -o sdltest.o
[root at localhost sdl_first]# gcc sdltest.o -o sdltest -L/usr/lib -lSDL
As far as I know sdl needs pthread library under linux, so:
gcc sdltest.o -o sdltest -L/usr/lib -lSDL -lpthread
should work better :slight_smile:

                                                        Hope this helps.
4

[root at localhost sdl_first]# gcc -Wall -c sdltest.c -o sdltest.o
[root at localhost sdl_first]# gcc sdltest.o -o sdltest -L/usr/lib -lSDL

Do this instead:

gcc -Wall -c sdltest.c -o sdltest.o `sdl-config --cflags`
gcc sdltest.o -o sdltest `sdl-config --libs`

(note the quote character is a backtick, and not a single quote mark.)

–ryan.

5

I don’t understand the output, but it works!

Thanks guys!
Russ> ----- Original Message -----

From: phoenix@minion.de (Christian Zander)
To:
Sent: Sunday, May 27, 2001 4:17 PM
Subject: [SDL] Re: Beginner Compilation Errors

On 27 May 2001 07:07:52 -0700, @Russell_Mackenzie wrote:

I’m unable to compile the simplest SDL program. I’ve provided the
program and gcc output below (I’m using RHL7.1). Any help will be
great.

[…]

Take a look at the output of ‘sdl-config --libs’ to get an idea of
which other libraries need to be linked in. Alternatively, you can
simply use sdl-config. (gcc sdl-config --libs --cflags …)

–

christian zander paranoia, n.: a healthy understanding
zander at hdz.uni-dortmund.de of the way the universe works.

6

hi,
Sorry to truoble U all.
I got it solved by myself.The problem is with compilation itself.
everyours
S.Praveen Kumar