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From:	=?iso-8859-1?Q?Andr=E9_Bleau?= <andre_bleau AT hotmail DOT com>
To:	<cygwin AT cygwin DOT com>
Subject:	Re: OpenGL: Linker errors when trying to compile w/GLUI
Date:	Fri, 16 May 2008 09:08:05 -0400
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godescbach  wrote: 

> Hi,
> 
> I am trying to compile example1.cpp in
> /var/share/doc/opengl-1.1.0/GLUIexamples/Cygwin. After trying numerous
> possibilities, I am at a loss. And there is no information on the web
> about this specific issue. Please advise.
> 
> $ uname -a
> CYGWIN_NT-5.1 escher_notebook 1.5.25(0.156/4/2) 2008-04-17 12:11 i686 Cygwin 

This info is not very usefull for me to help you; it tells only which version of the cygwin1.dll you use.
It would be more significant to report the output of : 

cygcheck -c openGL 

which would tell us which version of the openGL package you have. 
I will assume 1.1.0-8 which is the latest; if not, please upgrade to it using the setup program. 

> 
> $ g++ -O2 -mno-cygwin example1.cpp -o example1 -L/usr/lib/w32api -lglui -lglut3
> 2 -lglu32 -lopengl32
> /usr/lib/w32api/libglui.a(glui_spinner.o):glui_spinner.cpp:(.text+0xd): undefine
> d reference to `___getreent'
> ...
> /usr/lib/w32api/libglui.a(glui_edittext.o):glui_edittext.cpp:(.text+0x237): more
> undefined references to `___getreent' follow> collect2: ld returned 1 exit status
> 

No surprise: -mno-cygwin and -L/usr/lib/w32api are incompatible 

> godescbachM AT escher_notebook /usr/share/doc/opengl-1.1.0/GLUIexamples/Cygwin
> $ view /usr/share/doc/Cygwin/opengl-1.1.0-8.README
>  

That file tells you how to rebuild the package from its sources. I don't think that's what you intended.
To learn how to _use_ the package, please view: 

/usr/share/doc/opengl-1.1.0/README.txt 

> godescbachM AT escher_notebook /usr/share/doc/opengl-1.1.0/GLUIexamples/Cygwin
> $ make> g++ -c -O2 -mno-cygwin example1.cpp
> g++ -O2 -mno-cygwin example1.o -L/usr/lib/w32api -lglui -lglut32 -lglu32 -lope
> ngl32 -o example1> /usr/lib/w32api/libglui.a(glui_spinner.o):glui_spinner.cpp:(.text+0xd): undefine
> d reference to `___getreent'
> ...
> /usr/lib/w32api/libglui.a(glui_edittext.o):glui_edittext.cpp:(.text+0x237): more
> undefined references to `___getreent' follow
> collect2: ld returned 1 exit status
> make: *** [example1] Error 1 

Obviously you added -L/usr/lib/w32api to the makefile. Undo all your changes to that file;
if unsure reinstall the package with the setup program. Then: 

cd /usr/share/doc/opengl-1.1.0/GLUIexamples
make clean
make 

That will build all 6 examples for both Cygwin (executables in the Cygwin subdir) 
and Mingw (executables in the Mingw subdir). 

Regards, 

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

P.S.: Please send all questions and comments about the openGL package to cygwin at cygwin dot com.



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