[Qt-interest] Segfault with an opengl widget

[Damien R.]

On 09/02/2010 10:31 AM, Trond Kjernåsen wrote:
 > You're right, this is a bug in Qt which has already been corrected for
 > 4.7. QGLContext::makeCurrent() should call internalWinId() instead of
 > winId() in that particular case. Could you try to change that and see if
 > it gets rid of the crash?

I tried to patch the debian version of qt but I have a problem in the 
package generation.

So, I have updated to Qt 4.7.0~beta2-3 and I do not have the segfault 
but I have the following warning:
QGLContext::makeCurrent(): Cannot make invalid context current.

So, an another modification in the source make that the current test is 
evaluate to true:
if (!d->valid) {
   qWarning("QGLContext::makeCurrent(): Cannot make invalid context 
current.");
   return;
}

while it is evaluate to false in qt 4.6.3.

So I will try to find why the test evaluation change between the two 
versions. Currently, I do not understand why d->valid is false.

-- 
Damien R.