[vtkusers] VTK plugin is not loaded in QtCreator.

[Zoltan Kovacs]

Hi all,

I have installed VTK 7.1.1 for Qt 5.8 in CentOS 7 with the configuation 
options

~/bin/cmake -G Unix Makefiles -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON 
-DBUIILD_SHARED_LIBS:BOOL=ON -DBUILD_TESTING:BOOL=ON 
-DCMAKE_BUILD_TYPE=Release 
-DCMAKE_INSTALL_PREFIX:PATH=/home/zko/VTK-7.1.1/install 
-DVTK_WRAP_PYTHON:BOOL=ON -DVTK_Group_Qt:BOOL=ON 
-DVTK_PYTHON_VERSION=2.7 -DVTK_QT_VERSION:STRING=5 
-DCMAKE_PREFIX_PATH:PATH=/home/zko/Qt/5.8/gcc_64/lib/cmake 
-DQT_QMAKE_EXECUTABLE:PATH=/home/zko/Qt/5.8/gcc_64/bin/qmake

Then the corresponding plugin library libQVTKWidgetPlugin.so was copied 
into the plugin directory of QtCreator. However, the QVTKWidet won't 
appear in the widget list when I open the UI editor window of QtCreator.
I obtained a libQVTKWidgetPlugin.so file from Trolltech Qt support 
persons who also installed VTK 7.7.1 with the same comfiguration 
options. I copied this file into plugin directory of Qtcreator and I 
could see the QVTKWidger in the widget list of the UI editor window of 
Qtcreator.

Then I checked the objects in both the plugin library files with objdump 
and I found that the qt_pluginMetaData and qt_plugin_instance symbols 
are missing from my libQVTKWidgetPlugin.so, whereas they can be found in 
the plugin library file obtained from Trolltech. Both should be coming 
through a file that is generated by moc. I have no idea why these 
wouldn't be there. Has any one an idea what went wrong with the 
compilation of VTK 7.1.1 in my desktop? Thank you very much!

Kind Regards,
Zoltan