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From:	=?iso-8859-1?B?QW5kcukgQmxlYXU=?= <andre_bleau AT hotmail DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: OpenGL does not render when linked with -mno-cygwin
Date:	Wed, 16 Mar 2005 14:37:24 -0500
Mime-Version:	1.0
X-OriginalArrivalTime:	16 Mar 2005 19:37:28.0469 (UTC) FILETIME=[9678DC50:01C52A5F]

Arvind N wrote:
>I am using g++ Version 3.3.3 on a Windows XP box to write a program that 
>draws mathematical
>functions as graphs. The program works fine when I compile and link without 
>-mno-cygwin and the graphs are rendered fine. However, if I add -mno-cygwin 
>to the compile line and "-L/usr/lib/mingw -lstdc++" to the link line, all I 
>get is a black screen. I am using GLUT to create the window and the menus 
>and all of those work fine but there is nothing rendered into the window. I 
>do not get any errors either.

Such a difference between a Mingw and a Cygwin application is often clue of 
a hidden bug in the application. Something may be corrupted or not 
initialized properly.

>
>I do not get any compiler/linker warnings or errors when I compile with 
>-mno-cygwin. Are there any dependencies that OpenGL has with cygwin1.dll?

No, OpenGL has no dependency on cygwin1.dll. The OpenGL implementation used  
is the one provided by M$ for Windows.

>The link line uses the libraries in the order "-lglut32 -lglu32 -lopengl32" 
>which seems to be what the documentation says.
>
>Here are the cygcheck outputs with and without mno-cygwin:
>
>* With mno-cygwin:
>...
>* Without mno-cygwin
>...
>I would appreciate any help with this.

There are 6 examples of C++ programs using GLUI, GLUT and OpenGL under 
/usr/bin/GLUI-examples
these were compiled with -mno-cygwin. Are you able to run them ?

Sources for these examples, including a Makefile, are in 
/usr/share/doc/opengl-1.1.0/GLUIexamples

>
>
>Thanks in advance,
>Arvind

André Bleau, Cygwin's OpenGL package maintainer
Please adress any question or comment about the OpenGL package to cygwin at 
cygwin.com

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