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Re: Trouble Compiling Cygwin GLUT Examples

John M Fernandes-Salling  wrote:
> Hello,
> I'm running Cygwin on a Windows Vista computer, and I'm having trouble compiling the 
> example GLUT c file "helloGlut.c" provided in the Cygwin OpenGL package.
> Using Cygwin, after navigating to the directory 
>  "/cygdrive/c/cygwin/usr/share/doc/opengl-1.1.0/GLUTExamples/Cygwin", I type 
> "make helloGlut" without quotes, and the output is:
> "cc -c -O2 helloGlut.c
> cc -O2  helloGlut.o -lglut32 -lglu32 -lopengl32   -o helloGlut
> helloGlut.o:helloGlut.c:(.text+0x86): undefined reference to '_glutInit'
> helloGlut.o:helloGlut.c:(.text+0x92): undefined reference to '_glutCreateWindow'
> helloGlut.o:helloGlut.c:(.text+0x9e): undefined reference to '_glutDisplayFunc'
> helloGlut.o:helloGlut.c:(.text+0xaa): undefined reference to '_glutKeyboardFunc'
> helloGlut.o:helloGlut.c:(.text+0xbb): undefined reference to '_glutMainLoop'
> collect2: ld returned 1 exit status
> make: *** [helloGlut] Error 1" without quotes.
> As far as I can tell, I've followed the instructions for setting up OpenGL, GLU, and GLUT 
> within Cygwin, so I'm at a loss as to what the problem is.  I'm new both to programming in> C, OpenGL, and using Cygwin, having formerly programmed in Java with the JOGL binding 
> for OpenGL.  Any help would be greatly appreciated.
> Thank you for your time,
> John Fernandes-Salling

I just discovered that the last version of the libglut-devel package now installs a glut.h file in /usr/include/GL. This file takes precedance over the one in /usr/include/w32api/GL and declares the same functions but with a different calling convention. This makes the packages libglut-devel and opengl incompatible; you will have to uninstall one of them if you have both. libglut-devel is for applications that will run through and X server while opengl is for application that will use the natve Windows interface. The first is Linux compatible at the source level while the second is not, but is much faster.

I will have to discuss the issue with the libglut-devel maintainer on the cygwin-apps list.


- André Bleau, Cygwin's volunteer OpenGL package maintainer.

Please direct any question or comment about the OpenGL package to cygwin at cygwin dot com


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