[Qgis-psc] Plans to move to Qt6

[Julien Cabieces]

Hi,

I did manage to compile QGIS on debian testing, and I'm currently
building it again (and try to make the oracle provider compile).

I don't use debian Qt packages (I want to keep my distribution
clean for now), just the binary with the unified
Qt installer. I installed the needed dependencies following the
instruction here :
https://github.com/qgis/QGIS/blob/master/.docker/qgis3-qt6-build-deps.dockerfile#L64

Good thing if you build with debian packages is that you could test
python tests because there is already a PyQt6 package.

Regards,
Julien



> Thanks Nyall,
>
> Sorry for the late reply... But clear!
>
> Happy to be a testing guinea pig for a new build.
> Anybody already have QGIS compiling on Debian Testing? (ideally without compiling dependencies not already available. Seen a lot of updated Qt6 related packages flying by in my 'apt upgrade's)
>
> If anybody is willing to spend a little online hackfest to make QGIS Qt6 (in current state) compiling on Debian testing, let me know: I'm in! I will also try later this day... have to find the earlier instructions/notes of Nyall first...
>
> Thanks for the work already done all !!
>
> Regards,
>
> Richard Duivenvoorde
>
> Ps: the glitches I see are also in other Qt apps...
>
> On 12/4/22 23:22, Nyall Dawson wrote:
>> On Sun, 4 Dec 2022 at 20:00, Richard Duivenvoorde <rdmailings at duif.net> wrote:
>>>
>>> Hi psc/devs,
>>>
>>> (Let me start to say: no pressure! I know we are all busy....)
>>>
>>> As an avid Linux user, trying to support the Gnome/Wayland windowing system, I see more and more glitches appearing in Qt5 applications recently (Gnome 43, Debian Testing).
>> 
>> Just to restate my position so that it's clear for anyone coming
>> across this thread: !!!!!! Don't use QGIS under Wayland -- there's SO
>> many bugs and limitations (which aren't our fault) :) !!!!!!
>> 
>>> Do we have some (version) planning about moving to Qt6?nOr are we maybe waiting for distro packagers to package certain (for us) essential Qt6 packages?
>> 
>> See https://github.com/qgis/QGIS-Enhancement-Proposals/issues/198 for
>> the current "grand plan" of QGIS + Qt6.
>> 
>> It's currently blocked by the lack of Python support. It's a work in
>> progress - see https://github.com/qgis/QGIS/pull/51060#issuecomment-1332232828
>> for the current state/sticking point. We were blocked by missing PyQt6
>> binaries until Sandro Mani put in a great effort and created these, so
>> now we're just(?) waiting on someone with time/sponsorship available
>> to do some complex work adapting the python bindings to make them
>> QT5/6 compatible. That's probably a good 3-4 days work if we're lucky.
>> 
>>> I know we are already building core parts for Qt6, and I'm not aware of all Qt6 work (failed to get stuff compiled some months ago...).
>> 
>> Everything should work on current master versions, with the exceptions of:
>> 
>> - Python/all plugins
>> - Oracle provider
>> - oauth support
>> - everything related to webkit (ie html widgets, layout html items)
>> - GPS serial port devices
>> 
>> Almost all c++ tests are passing, but obviously Python tests can't be
>> run yet, so the overall stability is a bit of an unknown.
>> 
>>>
>>> I do understand that it will not be easy, and will probably cost a lot of energy/time/money...
>>> But as 3.28 will be LTR, I was wondering if we maybe could take that moment to (some idea's):
>>>
>>> - create a funding round for Qt6 (I'd happy to chip in for such 'labeled' funding)? It's the 'gift season' isn't it?  🎵"All I want for Christmas is 🎵 .... you and Qt6/QGIS6'🎵 ?
>>>
>>> - maybe gather as much as 'Qt6-able' people for the next Hackfest.. to give it a boost? Or maybe theme the hackfest a 'moving to Qt6' ? Even wilder idea: invite Yorik van Havre (Freecad) to the hackfest as the also have to move up....?
>>>
>>> - to do a minimal gui branch, in which we piece by piece pull ui functionality in (if I am correct one of the long standing wishes is to have an even better ui/logic separation)?
>> 
>> You actually can already run the full QGIS application (gui, 3d and
>> all) under Qt 6.
>> 
>>>
>>> I know: "idea's are cheap" Off course this will all come with a cost, I'm sort of asking if there is a plan to chop the work up in pieces so we can maybe (depending on money/time) grow to a QGIS6 ;-)
>> 
>> Well, the TLDR is that *someone* needs to spend the better part of a
>> week getting Qt6 Python support in place, whoever that is/however we
>> make it possible. :)
>> 
>> Thanks for keeping the discussion flowing!
>> 
>> Nyall
>> 
>> 
>>>
>>> And as I am just partially aware of the deep technical details, this email can be ignored if I'm too eager...
>>>
>>> Regards (and again: not meant to give pressure!!),
>>>
>>> Richard Duivenvoorde
>>>
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>
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