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Message-ID: <3DE1B534.3000205@nigels.com>
Date: Mon, 25 Nov 2002 16:29:24 +1100
From: Nigel Stewart & Fiona Smith <nigels AT nigels DOT com>
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To: James Shaw <qumqam AT yahoo DOT com>,
   Nigel Stewart <nigels AT goanna DOT cs DOT rmit DOT edu DOT au>
CC: cygwin AT cygwin DOT com, mahy AT student DOT fsa DOT ucl DOT ac DOT be
Subject: Re: cygwin with opengl
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James,

Thanks for such an informative and detailed response.
It turns out to be a FAQ for our OpenGL students
who like to compile on Linux and Cygwin.

http://goanna.cs.rmit.edu.au/~gl/teaching/cs549/index.html

Do you mind if I recycle your posting?

And yes, we hit the same "but why doesn't gcc just _know_
what I want, like MSVC _seems_ to..." mentality...

Cheers,

Nigel

James Shaw wrote:

>Hi Samuel,
>
>I posted a short reply to the list yesterday,
>which I'm guessing you didn't see.  Since you're
>asking again, I'll use this opportunity to give a
>longer answer.  [Note though that if you don't
>regularly check the list, please explicitly ask to
>be cc'ed.]
>
>You had two postings.  The most recent said:
>  
>
>>I cannot compile a file.c where there is the
>>    
>>
>following
>  
>
>>include : > GL\glut.h GL\glu.h GL\gl.h
>>    
>>
>
>The first posting was more informative and said:
>  
>
>>I have tried with : gcc -o file -Wall -lglut -lGL
>>    
>>
>-lGLU file.c
>  
>
>>but I recieved the following message :
>>/usr/lib/gcc-lib/i686-pc-cygwin/3.2/
>>    
>>
>../../../../i686-
>  
>
>>pc-cygwin/bin/ld : cannot find -lGLU
>>/usr/lib/gcc-lib/i686-pc-cygwin/3.2/
>>    
>>
>../../../../i686-
>  
>
>>pc-cygwin/bin/ld : cannot find -lGL
>>    
>>
>
>So, it looks like your include path is ok, since
>you only got errors at the linker stage.
>
>  
>
>>I'm sure I have installed the file opengl....tar.bz2
>>    
>>
>
>You probably have, but let's check to make sure.
>You should ls /usr/include/GL and find the .h
>files that you include there.  Next, you should ls
>/usr/lib.  Unfortunately, as far as I see, my gl
>libraries aren't in /usr/lib, but are lower down
>in /usr/lib/w32api.  So, check if you have the
>following files there: libopengl32.a libglu32.a
>libglut32.a
>
>Assuming you do, you then have the OpenGL
>developers stuff, as far as I know.
>
>  
>
>>Can you propose me some technics to reslove my
>>    
>>
>problem :
>  
>
>>-compile? I use : -lglut -lGLU -lGL -lopengl
>>-configure some path???
>>-set up the libraries???
>>    
>>
>
>Ok, I'll give you the exact command line I use, for
>one file:
>        gcc hellogl.cpp -o hellogl -lglut32 -lglu32
>-lopengl32
>
>Note that glut comes first, followed by glu and
>opengl.  Also, note that their names aren't gl,
>glu and glut (as one might expect) but opengl32,
>glu32,  glut32.  This matches the libraries in
>your /usr/lib/w32api directory.  In general, unix
>libraries of the name lib<name>.a, are included
>with a -lname.   I'm guessing your main problem
>was that there are no files with the names:
>libglu.a or libgl.a hence your errors claiming no
>-lGL or -lGLU.  [Oddly enough, there is a
>libglut.a, but I don't know how it differs from
>libglut32.a, and I haven't tried it.  I've ignored
>it, and suggest you do too.]
>
>Now, I assume the above will work, but I'll have
>to admit, I'm not quite sure how gcc knows to look
>in w32api, so if you have problems, try adding:
>        -L/usr/lib/w32api
>or explicitly list the libraries you want to link:
>        /usr/lib/w32api/libglut32.a
>/usr/lib/w32api/libglu32.a
>        /usr/lib/w32api/libopengl32.a
>
>  
>
>>Thanks to help me because I have to do my opengl
>>homework for few days!!!
>>    
>>
>
>I think with the correct library names you'll be
>up and running.  This isn't gl related, but if you
>are planning on using cygwin and gcc, you may want
>to spend a little time and research into
>understanding how the compiler works (e.g. so
>you'd know to look in /usr/lib; that you are both
>compiling and linking in one step, etc.).
>
>Best of luck on your homework,
>James Shaw
>
>
>
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