Qt5 -> KDE5?

Martin Gräßlin mgraesslin at kde.org
Mon May 9 18:19:31 BST 2011

On Monday 09 May 2011 18:03:18 Olivier Goffart wrote:
> Hi,
> With Qt5 around the corner[1], I think it is time to start thinking about KDE5
> Raw summary:
>  - Qt5 is planed to be released in about one year from now if everything goes 
> well.
>  - It should be mostly source compatible with Qt4, and is just an opportunity 
> to break binary compatibility.
>  - QWidget just stay for compatibility. All focus is put on QML. Do not expect 
> new development on QWidgets from Nokia.
>  - The "OpenGouvernance" should finaly come into light, meaning we (as KDE), 
> can contribute easier to Qt.
> I guess it make sens, as Qt breaks binary compatibility, to do the same in 
> kdelibs.
> Does that mean "KDE 5"? or "KDE SC 5"? Not necessarily. 
> We can break binary compatibility, and change the .so version of our library 
> without changing the major version of KDE itself.
> But I think it would anyway still be a smart move to do it.
While I agree we should call it "5", I think that some users would prefer to have no .0 again. 
And I doubt it will matter how much we tell that it's not like the last time.
> And I think this is a perfect opportunity to get some KDE class in Qt as we 
> planed. [2]
> Some item we might want to think about:
>  - Do we want "KDE 5" to be a big change, or just a small increment?
>  - Do we want to focus on QML, or stay with QWidget?
I think you answered that question with the lessions to be learned from KDE4 quite nicely.
>  - Shall we try drive Qt5 based on KDE5's need?
>  - Do we have more visions for what KDE5 should or should not be?
> I guess there is as many opinions as people involved :-)
> Many things to think about, and that can be discussed further, and decided in 
> Platform11 [3] (I will be there)
> But in my opinion, if there is something we should learn from the KDE4 
> transition, it is not to be too ambitious.
> -- 
> Olivier
> [1] http://labs.qt.nokia.com/2011/05/09/thoughts-about-qt-5/
> [2] http://community.kde.org/KDE_Core/QtMerge
> [3] http://community.kde.org/KDE_Core/Platform_11
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