[QGIS-Developer] Qt6 builds and plugins -- ready for testing!

[Julien Cabieces]

Hi,

Thank you Nyall for continuing this work and all the recent pull
requests that have fixed so many things.

Be aware that my initial work was funded by Oslandia, my employer. And
then, QGIS.org funded me to do the needed work to push cleanly on QGIS repository.

Many thanks to both of them and all people involved in this work.

Regards,
Julien


> Hi list,
>
> With some excellent work recently completed by Julien, we're now at a stage where there's no *major* roadblocks preventing plugins from
> functioning under the Qt6 builds!
>
> In fact, the first plugin has already been ported to be compatible with these (First Aid Plugin) -- see
> https://github.com/wonder-sk/qgis-first-aid-plugin/commits/master/ . 
>
> I think we're now at a stage where wider testing of the Qt6 builds and feedback via bug reports are valuable. A couple of notes:
>
> - We're up to roughly 2/3rd of the existing Python tests passing on Qt 6 builds. That's obviously not everything, so we aren't finished with this
> work yet 😁
>
> - There's a script available in the repo for automatically upgrading QGIS plugins/scripts to Qt 6 compatibility WITHOUT BREAKING compatibility
> with older releases/qt5 based releases. It's here: https://github.com/qgis/QGIS/blob/master/scripts/pyqt5_to_pyqt6/pyqt5_to_pyqt6.py
>
> - After running the script, you'll also need to add "supportsQt6=yes" to your plugins metadata configuration. Otherwise the Qt6 builds will just
> ignore your plugin and will refuse to load it. See eg
> https://github.com/wonder-sk/qgis-first-aid-plugin/commit/3687be7d9e026c59c9b775caaf5ee18cf8639886
>
> - You'll need to compile your own Qt 6 build. There's no nightlies or any prepackaged versions available.
>
> - There are still some known issues with enum handling, but please open bug reports when you encounter these!
>
> - The plugin manager is currently broken in the Qt6 builds. Use a Qt5 build to enable plugins 
> 🤣
>
> Again, to reiterate, there's NO plans for moving to QGIS 4.0 on the horizon. The plan is to allow plugins to add Qt6 support without breaking
> any compatibility with Qt5/older releases, so that the effort required by plugin authors is extremely minimal. And with any luck, the
> pyqt5_to_pyqt6.py script will do 99% of the work for you. Qt 6 builds of QGIS 3.x will become available at some stage in a "preview release"
> capacity, and likely some platforms will move to Qt6 only releases when necessary for that platform (eg MacOS, wayland only linux systems).
> Read more about the plan at https://github.com/qgis/QGIS-Enhancement-Proposals/issues/198
>
> This work has ONLY been possible thanks to funding from qgis.org, ie it's possible only because of the users and organisations sponsoring
> QGIS!  
>
> Nyall 
>
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-- 

Julien Cabieces
Senior Developer at Oslandia
julien.cabieces at oslandia.com