[Qgis-psc] Qt6 status

Sun Aug 24 18:47:21 PDT 2025

On Sat, 23 Aug 2025 at 19:35, Mathieu Pellerin via QGIS-PSC
<qgis-psc at lists.osgeo.org> wrote:
>
> With regards to the timeline question raised by Marco in this thread, I'd like to add a +1 to the idea of postponing QGIS 4.0. At the very least, I think we should make a conscious decision about it sooner than later :)

I'm also +1 to deferring QGIS 4.0 for one release cycle. (ie skip
October's release, and release 4.0 in February).

The CI port to Qt 6 is basically ready now (at
https://github.com/qgis/QGIS/pull/62809). However -- there's still a
handful of tests which pass under Qt 5 which are skipped on the Qt 6
builds right now, and this makes me nervous. If we merged #62809 today
and moved exclusively to Qt 6 then we'll lose some test coverage. I'd
prefer to hold off merging #62809 until we can get these remaining
tests passing on the ubuntu qt6 builds.

Hopefully that's just a matter of days, not weeks!

Nyall

>
> While we should all be very proud of the regular release interval discipline we've shown in recent years, I think several factors warrant at least seriously considering delaying QGIS 4.0.
>
> Like Matthias, I believe the fact that a Qt6-based development environment not adding a *considerable* amount of time spent building not having been unlocked yet means most of our developers are still on Qt5. On my end, I did try to switch to a Qt6-only development environment during the last freeze period, only to find myself going back to Qt5 to retain an acceptable build wait time. While we have had Qt6-based CI testing going on for a while and being improved week after week, I would feel really insecure shipping QGIS 4.0 with Qt6 libraries when most devs have not spent a fair amount of time running Qt6 builds (both as part of their development as well as mapping production environments). We're also a few weeks away from bug fixing, and we risk entering it with developers still fixing bugs against Qt5 libraries (because it's that much more efficient).
>
> On top of what has been raised above, something less crucial but that is still worth factoring in: we had a couple of interesting changes we wanted to push into QGIS 4.0 which at the moment are increasingly at risk of not making it into an October release date. For example, at this moment in time, I'm certain the icons set revamp proposition can't be achieved in time. It'd be good to hear the status of other important changes like the welcome screen revamp.
>
> Beyond that, thanks for the status updates and ongoing efforts to all involved! Keen to hear what others have to say about this.
>
> Mathieu
>
>
>
> On Fri, Aug 22, 2025 at 10:30 PM Matthias Kuhn via QGIS-PSC <qgis-psc at lists.osgeo.org> wrote:
>>
>> Hi all,
>>
>> Nice to see the progress on the ci front, thanks Nyall.
>> The Qt6 packages for Windows and macOS are also ready to be tested as well (thanks Jürgen).
>>
>> I suspect many developers do most of their work with Qt5 (because it's more efficient looking at the build times) and therefore most testing by core developers and technical people is done on Qt5 builds.
>> One thing that could help is to change the default to BUILD_WITH_QT6 as soon as possible and collect some low hanging fruits.
>>
>> With the feature freeze less than 3 weeks in front of us and the release in about two months, I think it's a good point to check if we are on track with the timeline or if we want to consider an adjustment as pointed out by Marco earlier in this thread.
>>
>> Cheers
>> Matthias
>>
>> On Fri, Aug 22, 2025 at 9:11 AM Alessandro Pasotti via QGIS-PSC <qgis-psc at lists.osgeo.org> wrote:
>>>
>>> I am currently on vacation but I will have a look next week.
>>>
>>> Kind regards
>>>
>>> --
>>> Alessandro Pasotti
>>> QCooperative:  www.qcooperative.net
>>> ItOpen:   www.itopen.it
>>>
>>> Il gio 21 ago 2025, 11:22 Marco Bernasocchi via QGIS-PSC <qgis-psc at lists.osgeo.org> ha scritto:
>>>>
>>>> Thanks Nyall for the work and answer.
>>>> on the other two points,
>>>>
>>>> - having some solution for the extremely slow sip build times on qt6
>>>>
>>>> Martin, do you have an ETA for David's grant https://github.com/qgis/QGIS-Enhancement-Proposals/pull/338
>>>>
>>>> - porting the ogc server ci to qt6
>>>> Alessandro, would that be something you'd be willing/would have time ressources to take over since you worked a lot on the server in the past?
>>>>
>>>>
>>>> it would be great if we can move all this forward so we can come closer to a qgis 4.0.
>>>>
>>>> I'd also would like to re ask if we should start preparing for a 1(x?) month delay for the freeze? And remember that there are funding available.
>>>>
>>>> Cheers
>>>>
>>>> Marco
>>>>
>>>>
>>>> On Fri, 8 Aug 2025 at 05:22, Nyall Dawson <nyall.dawson at gmail.com> wrote:
>>>>>
>>>>> On Fri, 8 Aug 2025 at 04:11, Marco Bernasocchi <marco at qgis.org> wrote:
>>>>> >
>>>>> > Hi all,
>>>>> > I was just pointed to this mail
>>>>> > https://lists.osgeo.org/pipermail/qgis-developer/2025-July/067716.html
>>>>> > and noticed that Nyall mentions some still needed work.
>>>>> >
>>>>> > @Nyall, do you think the freeze in 5 weeks is realistic? Do we need to plan/prepare something different?
>>>>> >
>>>>> > Please, all developer involved in moving to Qt6, that the psc still has reserved funding for this.
>>>>>
>>>>>  - porting the Ubuntu ci infrastructure to qt6, including the database
>>>>> server based tests
>>>>>
>>>>> I'm currently working on this -- see https://github.com/qgis/QGIS/pull/62809
>>>>>
>>>>> Nyall
>>>>>
>>>>>
>>>>>
>>>>> >
>>>>> > Cheers Marco
>>>>> >
>>>>> > --
>>>>> > Marco Bernasocchi
>>>>> >
>>>>> > QGIS.org Chair
>>>>> > OSGEO.org VP Europe
>>>>> > OPENGIS.ch CEO
>>>>> > http://berna.io
>>>>
>>>>
>>>>
>>>> --
>>>> Marco Bernasocchi
>>>>
>>>> QGIS.org Chair
>>>> OSGEO.org VP Europe
>>>> OPENGIS.ch CEO
>>>> http://berna.io
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