Draft: [3.0] CI: add a Debian target to compile with Qt6

On top of !6548 (merged)

changed milestone to %3.0.x maintenance

added Component:: CI label

mentioned in merge request !6548 (merged)

added 1 commit

• e6924b20 - contrib: mpcdec: apply all patches

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added 3 commits

• bc554266 - contrib: mpcdec: only build libmpcdec
• e2faac7b - contrib: mpcdec: apply all patches
• 64288d6f - CI: add a Debian target to compile with Qt6

Compare with previous version

It seems that it's still using Qt5:

checking for Qt5Core >= 5.5.0 Qt5Widgets Qt5Gui Qt5Svg... yes
checking for Qt5X11Extras... yes
checking for moc-qt5... no
checking for moc... /usr/lib/x86_64-linux-gnu/qt5/bin/moc
checking for rcc-qt5... no
checking for rcc... /usr/lib/x86_64-linux-gnu/qt5/bin/rcc
checking for uic-qt5... no
checking for uic... /usr/lib/x86_64-linux-gnu/qt5/bin/uic

@robUx4 That's because autotools build system was not changed.

I managed to build with Qt6 using this build system patch (+ another required cherry-pick): https://code.videolan.org/-/snippets/1815

Runtime is broken, unfortunately, but it is a starting point.

// that aside, rebasing your branch on top of 3.0.x only left 068f5d0d, 0289edad, 22e73a44, fc6bc315 and your Debian Qt6 CI patch.

Thanks for the tips. Indeed the Qt5 packages have the number in them so we have to explicitly target Qt6 to be able to use them.

You may submit the backport of "qt: add const to psz_config" which can already be merged.

Done on asturm's behalf after discussing with him: !7097 (merged)