Strange behavior of OpenGLUT

Strange behavior of OpenGLUT

[ldries46]

I am using Open GL in one of my programs therefore I do include the Open GL 
library, the open GLU library and the Open Glut library
with the following calls:

with OpenGL; use OpenGL;
with OpenGL.GLU; use OpenGL.GLU;
with OpenGL.GLUT; use OpenGL.GLUT;

I show the strange behavior by the next code:

procedure display is -- chanced: GLvoid display( GLvoid );
begin
    glClear( GL_COLOR_BUFFER_BIT ); --correctly compiled
    ShowAxis;
    Wall;
    drawTriangles;
   glFlush;                                              --correctly 
compiled
   glutSwapBuffers;                               --NOT correctly compiled
end display;

then I get the following error message:

undefined reference to 'glutSwapBuffers'

while in the OpenGL.Glut package the following is presented:

   procedure glutSwapBuffers;

All calls to OpenGL.Glut subprograms in the file are found to have the same 
error but every variable from this file is correctly compiled
All calls op OpenGL subprograms are also correctly compiled.

I am using the OpenGL-glut.ads  by David Holm 2002-2003

What do I have to do to get this correctly compiled using GNAT GPS 2012

L. Dries

Re: Strange behavior of OpenGLUT

[Egil Høvik]

On Wednesday, February 27, 2013 10:15:52 AM UTC+1, ldries46 wrote:
> 
> undefined reference to 'glutSwapBuffers'
> 

This looks like a linker error, not a compiler error. You probably need to link with glut. I guess you already link with opengl, something along the lines of "-lGL", so try to add "-lGLU" or "-lglut" as well.

Re: Strange behavior of OpenGLUT

[ldries46]

I have  the following links in my grp file:

"-LC:\windows\system32", "-LD:\gcc\lib\freeglut", "-lfreeglut"
In the directory D:\gcc\lib\freeglut the file freeglut.lib is found which 
contains the glut.... subprograms according to Libview



"Egil H�vik"  schreef in bericht 
news:f0430110-bb38-48fe-979b-debab739d93e@googlegroups.com...

On Wednesday, February 27, 2013 10:15:52 AM UTC+1, ldries46 wrote:
>
> undefined reference to 'glutSwapBuffers'
>

This looks like a linker error, not a compiler error. You probably need to 
link with glut. I guess you already link with opengl, something along the 
lines of "-lGL", so try to add "-lGLU" or "-lglut" as well. 

Re: Strange behavior of OpenGLUT

[Simon Wright]

"ldries46" <bertus.dries@planet.nl> writes:

> I have  the following links in my grp file:
>
> "-LC:\windows\system32", "-LD:\gcc\lib\freeglut", "-lfreeglut"
> In the directory D:\gcc\lib\freeglut the file freeglut.lib is found
> which contains the glut.... subprograms according to Libview

I don't know what a grp file is - unless you mean gpr?

It might help to use forward slashes instead of backslashes?

 "-LC:/windows/system32", "-LD:/gcc/lib/freeglut", "-lfreeglut"

Re: Strange behavior of OpenGLUT

[ldries46]

This gives exactly the same result.

"Simon Wright"  schreef in bericht news:ly8v6aowso.fsf@pushface.org... 

"ldries46" <bertus.dries@planet.nl> writes:

> I have  the following links in my grp file:
>
> "-LC:\windows\system32", "-LD:\gcc\lib\freeglut", "-lfreeglut"
> In the directory D:\gcc\lib\freeglut the file freeglut.lib is found
> which contains the glut.... subprograms according to Libview

I don't know what a grp file is - unless you mean gpr?

It might help to use forward slashes instead of backslashes?

"-LC:/windows/system32", "-LD:/gcc/lib/freeglut", "-lfreeglut"