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Re: OpenGL does not render when linked with -mno-cygwin


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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