Fixed crash on shutdown with GL when leaking QGLWidgets

The problem was the QGLContextResource destructor which was called
when the QtOpenGL dll was unloaded. At this point in time, the gl
driver had already been unloaded so any gl calls at this point in time
would crash. It is simply wrong for the destructor to try to clean up,
so we instead output a warning if resources are leaked.

1 files changed, 7 insertions, 2 deletions

diff --git a/src/opengl/qgl.cpp b/src/opengl/qgl.cpp
index 3e30fe4..65d6f99 100644
--- a/src/opengl/qgl.cpp
+++ b/src/opengl/qgl.cpp
@@ -4916,8 +4916,13 @@ QGLContextResource::QGLContextResource(FreeFunc f, QObject *parent)
 
 QGLContextResource::~QGLContextResource()
 {
-    while (!m_resources.empty())
-        removeGroup(m_resources.begin().key());
+#ifndef QT_NO_DEBUG
+    if (m_resources.size()) {
+        qWarning("QtOpenGL: Resources are still available at program shutdown.\n"
+                 "          This is possibly caused by a leaked QGLWidget, \n"
+                 "          QGLFrameBufferObject or QGLPixelBuffer.");
+    }
+#endif
 }
 
 void QGLContextResource::insert(const QGLContext *key, void *value)