Re: Building opengl applications

[Andre Bleau <bleau at igb dot umontreal dot ca>]

Mikael Ĺsberg wrote:
> Hello, I am trying to build a simple OpenGL program (an example taken from
> the famous "Red Book"). However, during the build process the following
> error messages are displayed:
>
> /cygdrive/c/DOCUME~1/ADMINI~1/LOCALS~1/Temp/ccK0lHn2.o(.text+0xe):test.c:
> undefined reference to `glEnableClientState@4'
> /cygdrive/c/DOCUME~1/ADMINI~1/LOCALS~1/Temp/ccK0lHn2.o(.text+0x1d):test.c:
> undefined reference to `glEnableClientState@4'
> /cygdrive/c/DOCUME~1/ADMINI~1/LOCALS~1/Temp/ccK0lHn2.o(.text+0x44):test.c:
> undefined reference to `glVertexPointer@16'
> /cygdrive/c/DOCUME~1/ADMINI~1/LOCALS~1/Temp/ccK0lHn2.o(.text+0x6b):test.c:
> undefined reference to `glColorPointer@16'
> /cygdrive/c/DOCUME~1/ADMINI~1/LOCALS~1/Temp/ccK0lHn2.o(.text+0x92):test.c:
> undefined reference to `glInterleavedArrays@12'
Messages like that may be an indication that you are using the wrong header 
files or the wrong librairies. You should use the headers from 
/usr/include/GL. They should have lines near the top that say:

** Modified to provide correct APIENTRY and WINGDIAPI definitions
** for Cygwin and Mingw

> Actually, there is more, but each error is an undefined reference so it
> seems gcc cannot find
> the libraries. I did install them, though.
> Building with -glut32 -lglu32 -lopengl32
It's -lglut32. Be sure to put -lglut32 -lglu32 -lopengl32 on the linking 
line _after_ any files that require them.


> What am I doing wrong?
>
> Hope you can help me =)
>
> // Mikael

André Bleau, Cygwin's OpenGL package maintainer.

email: bleau at igb dot umontreal dot ca
(Fight SPAM: encode your email-address)

Please address all questions and problem reports about Cygwin's OpenGL 
package to cygwin@cygwin.com .


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