Support Qt6

[ulm]

Gentoo Linux is phasing out Qt5, see https://bugs.gentoo.org/955180.

[a17r]

Qt5 is declared deprecated in Gentoo

At this point in time, Linux distributions are already tracking which packages are blocking a future Qt5 cleanup. Real Qt Company OSS support stopped back in 2020, when public availability of LTS releases started to be delayed for 1 year, stable branch repository access got closed down (with 5.15 branch repository receiving any new LTS tag one year after commercial release) and only Qt6-relevant bugs are being fixed (then backported) since then. The final release happened on 2025-05-19, which means a) we will not get it until 2026-06-19, b) any bugs discovered since last May will not be fixed and c) no bugs since 2020-12-08 that haven't also been affecting Qt6 were fixed at all.

At least Gentoo, Alpine and Ubuntu are entertaining Qt6 porting trackers by now, for Gentoo, Qt5 revdep cleanups are in full swing already.
https://bugs.gentoo.org/show_bug.cgi?id=qt5-removal
https://gitlab.alpinelinux.org/alpine/aports/-/issues/17114
https://ubuntu-archive-team.ubuntu.com/transitions/html/qt5-removal.html

The good news is that the porting effort to Qt6 is supposed to be much smaller than from Qt4 to Qt5. Links:
https://doc.qt.io/qt-6/portingguide.html
https://www.qt.io/blog/references-and-hints-about-porting-from-qt5-to-qt6
https://www.qt.io/blog/porting-from-qt-5-to-qt-6-using-qt5compat-library

[blizzard4591]

With the latest commits from tag 0.10.3, Qt6 should work :) Please report and close when it works for you :)

[ulm]

Thank you!
Could you also tag a release for qt5-sqlcipher?
Edit: And consider renaming the package (e.g. to qt-sqlcipher) otherwise it might be confusing. 😄

[blizzard4591]

I tagged a new release. Sadly, Debian does not package private headers of the Sql module, which breaks package builds there. But for you, I hope this will be easier :)
I renamed the project in the master branch to libqt6sql6-sqlcipher.

[ulm]

With the latest commits from tag 0.10.3, Qt6 should work :) Please report and close when it works for you :)

0.10.3 works fine here. The only quirk was that I had to patch the find_package(QT NAMES ...) line and disable Qt5 entirely, otherwise it would find Qt5Config.cmake first, when both Qt5 and Qt6 are installed on the system:
https://github.com/gentoo/gentoo/blob/master/net-im/openmittsu/files/openmittsu-0.10.3.0-cmake-no-qt5.patch

Not sure if there is a good way to do this in a more portable way. (Maybe not worth bothering, as the obvious fix is to drop support for Qt5.)

[a17r]

The obvious fix is to not rely on automagic and use an explicit cmake option to find either Qt5 or Qt6.