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From:	=?iso-8859-1?B?QW5kcukgQmxlYXU=?= <andre_bleau AT hotmail DOT com>
To:	<cygwin AT cygwin DOT com>
Subject:	Re: Segmentation Fault in OpenGL - glutMainLoop
Date:	Wed, 1 Dec 2010 10:01:46 -0500
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Nathan Rose wrote:
=20
> Hi all,
=20
Hi Nathan,
=20
>=20
> I suspect this problem may be beyond the scope of this mailing list, but =
I would really appreciate any
> help that you could provide.=20
>=20=20
> I have someone else's code that uses OpenGL (it's a massive set of files,=
 so I'm not going to attach them > here). It compiles fine on Cygwin, but w=
hen the glutMainLoop method is called I get a segmentation fault. > I have =
tested it on Ubuntu and this does not occur there, so my assumption is that=
 there is something=20
> wrong with how I have set up Cygwin. The following packages have been ins=
talled:=20
> libglut-devel
> freeglut
> libglut3
> opengl
> glproto
> libGL-devel
> libGL1
> libGLU-devel
> libGLU1
> libglitz
> libxcb-dlx-devel
> libxcb-glx0
> (basically, I've installed everything from the Select Packages page that =
has 'gl' in its name)
>=20
> I have attached the stackdump from the segfault and the output from cygch=
eck, in case they can help=20
> identify the cause of this issue. I'm not expecting that anyone will be a=
ble to magically solve this with=20
> what little information I have provided, but any hints as to which direct=
ion I should proceed would be=20
> appreciated.
=20
First thing: there are 2 ways to use OpenGL and GLUT under Cygwin: through =
an X server and natively. As you=20
ran it under Unbutu, I suspect you use the X server, but please confirm it.=
 I cannot deduce anything from=20
your stackdump. Some applications have configure script to build with an X =
server on Linux and natively on=20
Windows.
=20
If your application goes for the native route, my package (the opengl packa=
ge) is concerned and I will try=20
to help you further. In that case, you may uninstall the other packages men=
tionned above to clear any=20
possible (but improbable) confusion. Try some simple program first: see if =
one of the native GLUT example=20
programs run properly: /usr/lib/glut-examples/helloGlut.exe , then /usr/lib=
/glui-examples/example6.exe .
If they work, try rebuilding them by going to /usr/share/doc/opengl-1.1.0/G=
LUTexamples and
/usr/share/doc/opengl-1.1.0/GLUIexamples and typing "make".
=20
If your application goes for the X server route, I will let the maintainers=
 of the related packages take you
from here. You may uninstall the opengl package to clear any possible (agai=
n improbable) confusion.=20
X related issues should be discussed on a separate list: cygwin-xfree at cy=
gwin dot com .
=20
>=20
> Thanks,
>=20
> Nathan
>=20
=20
HTH,
=20
Andr=E9 Bleau, Cygwin's OpenGL package maintainer
Please send any questiopn or comment about the OpenGL package to cygwin at =
cygwin dot com,
not directly to me.=20=09=09=20=09=20=20=20=09=09=20=20

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