Decommissioning Qt 5 CI

[David Redondo]

Am Freitag, 31. Juli 2026, 11:34 schrieb Ben Cooksley:
> On Fri, Jul 31, 2026 at 9:15 PM David Redondo <kde at david-redondo.de> wrote:
> 
> > Am Donnerstag, 30. Juli 2026, 20:53 schrieb Ben Cooksley:
> > > On Fri, Jul 31, 2026 at 3:47 AM David Redondo <kde at david-redondo.de>
> > wrote:
> > >
> > [Snip]
> > >
> > > So the Plasma developers want to keep supporting Qt 5 for essentially
> > > eternity and never drop support for it?
> > >
> > > At what point do you stop, or do you just keep continuing to maintain
> > > compatibility because one distribution doesn't want to drop
> > > $unmaintainedQt5App?
> >
> > (readding dropped lists)
> >
> > I dont't know the concrete point in time  but  given that there are some
> > big
> > applications on still on Qt5 I would say it's too early now.
> >
> 
> Please quantify that and list the applications you consider "big" that need
> to have ported before this can be abandoned.
> 
> 
> >
> > Btw Plasma 5 dropped support of Qt4 builds of breeze and oxygen  in 2020
> > with
> > 5.18, see
> > https://mail.kde.org/pipermail/plasma-devel/2020-January/108585.html
> 
> 
> >
> > I don't think we need an image provided by sysadmin and build kf5 on our CI
> > infra. Couldn't we just download a image of $LTS distro like okular does?
> >
> > https://invent.kde.org/graphics/okular/-/blob/master/.gitlab-ci.yml?
> > ref_type=heads#L24
> > <https://invent.kde.org/graphics/okular/-/blob/master/.gitlab-ci.yml?ref_type=heads#L24>
> 
> 
> Depends on the number of times your job runs.
> Doing jobs that way is expensive because everytime the job runs it
> re-fetches every single dependency from distribution archives and installs
> them in the container before it even starts building.
> 

I've typed it up for breeze here:
https://invent.kde.org/plasma/breeze/-/merge_requests/630
job is here:
https://invent.kde.org/plasma/breeze/-/jobs/4788674

Because of the inclusion of all our default rules, it runs only when triggered manually
like all the other Plasma build jobs. 

> >
> > > Will Plasma developers keep Qt 5 installed on their local machines and
> > > perform appropriate testing for that with the legacy, unported
> > applications
> > > still using Qt 5?
> > > Just having CI compile something isn't a true test as to whether it works
> > > or not and risks silent bitrot taking place due to behaviour differences
> > > between Qt 5 and Qt 6.
> > >
> > >
> > > >
> > > > Cheers,
> > > > David
> > > >
> > > >
> > > Regards,
> > > Ben
> > >
> 
> 
> Regards,
> Ben
>