From: [email protected]

Bytheway: Here is a simple program that is usable to test the qt behaviour:

// Standard C/C++
#include <stdio.h>

// Standard Qt
#include <qapplication.h>
#include <qgl.h>

int main (int argc, char* argv[])
{
QApplication a(argc,argv);

if (QGLFormat::hasOpenGL() == false)
{
qWarning ("This system has no OpenGL support. Exiting.");
return -1;
}

printf ("Yout system has OpenGL support.\n");
return 0;
}

There is an interesting point during the linking as well: Normally, because as I mentioned in my previous post the Qt library will dynamically search for
the OpenGL lib, there is no need to link against OpenGL:

g++ -o bug bug.cpp -I/usr/include/qt -lqt-mt

This command succeeds as expected but crashes during runtime:

~/tests/debian_qt_bug> ./bug
Floating point exception

Linking against the OpenGL library explicitly creates an executable showing
the standard buggy behaviour:

g++ -o bug bug.cpp -I/usr/include/qt -lqt-mt -lGL

~/tests/debian_qt_bug> ./bug
This system has no OpenGL support. Exiting.


WR


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