Proposal to Update Minimum CMake Version to 3.22

[Ömer Fadıl USTA]

Dear KDE Core Development Team,

I hope this message finds you well. I would like to propose an update to
the minimum required version of CMake for KDE Frameworks and KDE Plasma
projects, raising it from 3.16 to 3.22.

The primary reason for this change is that there are currently no
distributions that still utilize CMake 3.16. While this transition may be
considered late for KDE 6.4, it is essential for KDE 6.5. Our existing
Continuous Integration (CI) systems are already using versions of CMake
that are newer than 3.16, meaning we do not perform checks for CMake 3.16
compu7yyyatibility.

Furthermore, with the release of Qt 6.9 stable, the minimum required
version of CMake for building Qt has been updated to 3.22, as noted in the
Qt 6.9 release notes[1]. This change emphasizes the need for us to align
our CMake version with the latest requirements to ensure compatibility and
maintainability.

It is important to note that while this change primarily affects KDE
Frameworks and KDE Plasma, we are not directly responsible for pushing this
change across all KDE projects, such as KDE Gears (KDE Apps). Some
projects, like Kdenlive and Krita, may be resistant to this change or may
prefer a slower transition. However, I believe that updating the minimum
CMake version to 3.22 will ultimately benefit our development process and
ensure that we are using a more modern and supported build system.

Additionally, with the release of CMake 4.0, support for versions below 3.5
has been officially dropped[2]. This further underscores the importance of
keeping our CMake version up to date.

Thank you for considering this proposal. I look forward to your feedback.

[1] :
https://doc-snapshots.qt.io/qt6-6.9/whatsnew69.html#build-system-changes
[2]:
https://cmake.org/cmake/help/latest/release/4.0.html#deprecated-and-removed-features

Ps: Sorry for crossposting to kde-core-devel and kde-devel lists.

Best regards,

Ömer Fadıl Usta
PGP key : 0xfd11561976b1690b
about.me/omerusta
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