plugin verification data mismatch

[mistralegna]

Hello to all of you !

I have a strange problem declaring a collection of designer plugins.

I have several designer plugins, who work well individually. Now, I'd like to group them using a collection of plugins, such as QDesignerCustomWidgetsCollectionInterface.

However, when I do this, the designer doesn't want to load the plugins. Instead, I have an error message : "plugin verification data mismatch". And another one saying that the collection plugin could not be loaded because of the undefined symbol corresponding to the single plugin library.

I use Qt 5.5.0.

Here is an excerpt of my code:

PluginClassName.hpp:

class QDESIGNER_WIDGET_EXPORT PluginClassName : public QObject,
  public QDesignerCustomWidgetInterface
{
    Q_OBJECT
    Q_INTERFACES(QDesignerCustomWidgetInterface)
    ...
};

WidgetsCollection.hpp:

class WidgetsCollection: public QObject,
        public QDesignerCustomWidgetCollectionInterface
{
    Q_OBJECT
    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QDesignerCustomWidgetCollectionInterface")
    Q_INTERFACES(QDesignerCustomWidgetCollectionInterface)
    ...
    private:
        QList<QDesignerCustomWidgetInterface*> m_allWidgets;
};

WidgetsCollection.cpp:

WidgetsCollection::WidgetsCollection(QObject* parent) :
    public QObject(parent)
{
    m_allWidgets << new PluginClassName(this);
}

Thanks a lot for your help !