qmlplugindump spams at build time: was created without a valid QML Engine

[Cris Dywan]

Recently building UITK produces zillions of warnings:

Found a dependency on Ubuntu.Components.Themes with two major versions:0.1 and 1.3 which is unsupported, discarding smaller version
Found a dependency on Ubuntu.Components.Themes.Ambiance with two major versions:0.1 and 1.3 which is unsupported, discarding smaller version
The item UCHeader was created without a valid QML Engine. Styling will not be possible.
The item UCBottomEdgeHint was created without a valid QML Engine. Styling will not be possible.
The item UCBottomEdge was created without a valid QML Engine. Styling will not be possible.
The item UCMainViewBase was created without a valid QML Engine. Styling will not be possible.
<Unknown File>: QML ListItemLayout: Invalid attached property!
<Unknown File>: QML ListItemLayout: Invalid attached property!
The item UCLabel was created without a valid QML Engine. Styling will not be possible.
The item UCLabel was created without a valid QML Engine. Styling will not be possible.
The item UCLabel was created without a valid QML Engine. Styling will not be possible.
The item UCAppHeaderBase was created without a valid QML Engine. Styling will not be possible.
The item UCAppHeaderBase was created without a valid QML Engine. Styling will not be possible.
The item UCActionItem was created without a valid QML Engine. Styling will not be possible.
The item UCActionItem was created without a valid QML Engine. Styling will not be possible.
The item UCStyledItemBase was created without a valid QML Engine. Styling will not be possible.
The item UCStyledItemBase was created without a valid QML Engine. Styling will not be possible.
The item UCStyledItemBase was created without a valid QML Engine. Styling will not be possible.
The item UCStyledItemBase was created without a valid QML Engine. Styling will not be possible.
The item UCStyledItemBase was created without a valid QML Engine. Styling will not be possible.
The item UCAbstractButton was created without a valid QML Engine. Styling will not be possible.
The item UCPageTreeNode was created without a valid QML Engine. Styling will not be possible.
The item UCListItem was created without a valid QML Engine. Styling will not be possible.
The item UCListItem was created without a valid QML Engine. Styling will not be possible.
The item UCPageWrapper was created without a valid QML Engine. Styling will not be possible.
The item UCPageWrapper was created without a valid QML Engine. Styling will not be possible.

[Cris Dywan (kalikiana)]

It looks like qmlplugindump may be the culprit:

qmlplugindump Ubuntu.Components 1.3

is enough to reproduce the warnings with an installed UITK.