[QGIS-Developer] QGIS 3.46 builds to use Qt6?

[Nyall Dawson]

On Tue, 17 Dec 2024 at 10:48, Greg Troxel via QGIS-Developer <
qgis-developer at lists.osgeo.org> wrote:

> I wonder about "less stable" qt5 and "more stable" qt6.  Do we really
> believe that qgis built on qt6, with no plugins will have fewer crashes
> and quirks, than the qt5 build?

Yes, I do. Because Qt 5 is not improving any more, but Qt 6 is. An example
would be when running under Wayland environments on linux -- it's a very
broken mess on Qt 5 and will never be fixed. On Qt 6 it's only a
slightly-broken mess, and will likely be non-broken within the next 12
months. There's a similar situation for apple processors, which never had
full official support on Qt 5 but ARE fully supported on Qt 6. This gap is
only getting wider as newer operating system updates and corresponding
changes break things underneath Qt 5.

There's also a limited stream of bug fixes getting ported back to Qt 5.15,
vs those flowing into the supported Qt 6 releases.

>  That is surprising to me at this point.
> Do we still believe that if one assumes "qgis with N random plugins that
> claim to support qt6"?

(Well, QGIS + **ANY** plugin = a less stable QGIS. 🤣 But that's a
completely different point)

> I expect a qt6 build is kind of like a .0 release, and we would want to
> have qt6 builds widel avaialable and time for feedback before saying
> it's stable.

I'd say we're well past the ".0" stage of Qt 6 support. Almost all the core
functionality is quite well tested at this stage, and third party clients
(like Mergin and QField) switched to Qt 6 based QGIS builds earlier this
year. I'm confident that by the time we hit a (potential) October 2025
milestone that we'll have a very stable Qt 6 build available.

Nyall



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