Major QDBus regression in Qt6 with potential impact on KDE

[Albert Astals Cid]

El dijous, 15 de desembre de 2022, a les 19:55:59 (CET), Bartosz Golaszewski 
va escriure:
> Hi!
> 
> I'm working on a piece of software that extensively uses QDBus. The
> project is based on Qt5. I'm trying to upgrade it to Qt6 but have
> encountered an issue with QDBus that's described in detail in my
> official bug report[1]. The report includes a link to a github repo
> with reproducible examples.
> 
> Short version is: it's impossible to connect to the InterfacesAdded or
> InterfacesRemoved signals (and potentially to any signals that have
> slightly more complex arguments) on the system bus with QDBus in Qt6
> (unless one enables QDBUS_DEBUG=1 in which case it's possible). I
> suspect some timing issue/race condition but don't know Qt enough to
> debug it.
> 
> While my project is not related to KDE, I thought I'd bring it to your
> attention (as KDE is scheduled to upgrade to Qt6). This bug definitely
> affects KDE as for instance the networkmanager-qt project subscribes
> for the InterfacesAdded signal of NetworkManager's paths and will no
> longer work with Qt6.
> 
> Has anyone in the KDE community encountered this bug yet? How does KDE
> deal with blockers like this? Seems like Qt is not eager to fix it on
> their side.

Remember Qt is Free Software, if you are blocked by it, you seem like a good 
person to try to fix it :)

Cheers,
  Albert

> 
> Best regards,
> Bartosz Golaszewski
> 
> [1] https://bugreports.qt.io/projects/QTBUG/issues/QTBUG-108822