I can't get this to compile!

Xerop · 02-23-2005, 05:59 AM

I have been trying for days to compile this code and I always get some sort of undefiened reference error and cannot compile as a result. I would like someone to compile the follwing code and send me the project if it compiles.

Code:

#include <gl/gl.h>
#include <glut.h>


void RenderScene();
void SetupRC();
void RenderScene(void)
{
    glClear (GL_COLOR_BUFFER_BIT);
    glFlush();
}
void SetupRC(void)
{
    glClearColor (0.0f, 0.0f, 0.0f, 0.0f);
}

int main(void)
{
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
   glutCreateWindow("Simple");
   glutDisplayFunc(RenderScene);
   SetupRC();
   glutMainLoop();
   
   return 0;
}

This project uses the gl,glu,glut libraries I am don't thing you need windows.h all this code does is bring up a window from the console.
Here is a link to the glut libraries (don't want to slow down this server) .
click here for glut libraries (win32)

Renderscene is called by glut main loop. Notice I passed that to one of the glut functions.

I am using code blocks as an IDE and minGW as a compiler.

THIS CODE IS OS NUETRAL! AS LONG AS YOU HAVE THE LINUX GLUT LIBRARY.
ALL IT DOES IS OPEN A BLANK WINDOW!

Hivemind · 02-23-2005, 06:04 AM

Undefined references is a linking failure. If you get as far as the linking stage (which in your case fails), the program did compile without errors. You should have posted the exact error message concering the undefiend references the linker is outputting. What you need to do is to tell linker which libraries you are using and where those libraries can be found if they are located in directory that is not normally checked by the linker.

Xerop · 02-23-2005, 06:25 AM

Ok sorry for not posting the errors, I was having problems linking to the glut libraries and I just got passed those now I am recieving what seems to be internal library link errors which were not there until the glut problems disapeared. I think it is probably my fault and I probably added an extra argument somewhere I'll look today. Here are the new errors I am recieveing:

Code:

C:/MinGW/bin/../lib/gcc/mingw32/3.4.2/libgcc.a(__main.o)(.text+0x4f): undefined reference to `__EH_FRAME_BEGIN__'
C:/MinGW/bin/../lib/gcc/mingw32/3.4.2/libgcc.a(__main.o)(.text+0x73): undefined reference to `__EH_FRAME_BEGIN__'
collect2: ld returned 1 exit status

hiteshmaisheri · 02-23-2005, 07:40 AM

Here the problem seems that the library path is not set and there is a linking error coming up in your case. Just check some way to get through the library path set in windows. I don't know windows, but in linux just set the LD_LIBRARY_PATH variable with path where the glut library resides.
This should work..
Hitesh

Xerop · 02-23-2005, 05:58 PM

Thank you very much for your help I think that the problem was in the arguments that I passed to the linker. I remade the project and only included the libraries that I needed and no other and everything went smooth.

These are the libraries I included:
glut32, opengl32
These are the arguments sent to the linker
-lglut32 -lopengl32
Now all the arguments in caps so there is no confusion as to what I passed use the small ones if you plan to use them.
-LGLUT32 -LOPENGL32
and that is a dash

I had to clarify for other noobs that may come and read this post!!!

hiteshmaisheri · 02-25-2005, 02:51 AM

Kewl.. That seems interesting ..

bigearsbilly · 02-25-2005, 07:19 AM

Also, I think you'll find it makes a difference
in what order you link.
The linker only scans once,
so if you link say
A_lib A_lib_user

it will work, but

A_lib_user A_lib

the A_lib_user will have missing refs as they come later.
The linker doesn't "look back".