Comment # 21 on bug 1112920 from Fabian Vogt

(In reply to Michel Normand from comment #20)
> Created attachment 788317 [details]
> bug1112920_qt5_12_QtQuick_Controls.log
> 
> (In reply to Fabian Vogt from comment #19)
> 
> FYIO, it seems I need to add more packages builds:
> 
> libqt5-qtbase
> libqt5-qtdeclarative
> libqt5-qtgraphicaleffects
> libqt5-qtquickcontrol
> libqt5-qtxmlpatterns
> 
> with those 5.12 packages I was able to run in my ppc64 guest without error
> the command /usr/bin/qmlplugindump-qt5 -v QtQuick.Controls 1
> as detailed in attached file.

Perfect, with that you should be able to build plasma5-desktop as well.

> Do we already have a target for Qt 5.12 in Tumbleweed ?

It's currently in beta, 5.12.0 Beta 3 is in a staging.

As soon as it's finally out (end of this month) it'll get merged.