[Development] Qt 5 Beta - undefined reference to QWidget

[Thiago Macieira]

On segunda-feira, 10 de setembro de 2012 10.55.21, Fabian.Gruber at conti-
engineering.com wrote:
> Hi,
> 
> I'm testing Qt 5 Beta with a simple Qt Widget Project on Linux.
> Mainly it's the one you get when creating a new project without any forms.
> In the .pro file I added widgets, qml and quick to the QT-variable.
> 
> When compiling the project I get the following errors:
> 
> moc_mainwindow.o:(.data.rel.ro._ZTV10MainWindow[vtable for
> MainWindow]+0xc4): undefined reference to `QWidget::styleChange(QStyle&)'
> moc_mainwindow.o:(.data.rel.ro._ZTV10MainWindow[vtable for
> MainWindow]+0xc8): undefined reference to `QWidget::enabledChange(bool)'
> moc_mainwindow.o:(.data.rel.ro._ZTV10MainWindow[vtable for
> MainWindow]+0xcc): undefined reference to `QWidget::paletteChange(QPalette
> const&)'
> moc_mainwindow.o:(.data.rel.ro._ZTV10MainWindow[vtable for
> MainWindow]+0xd0): undefined reference to `QWidget::fontChange(QFont
> const&)'
> moc_mainwindow.o:(.data.rel.ro._ZTV10MainWindow[vtable for
> MainWindow]+0xd4): undefined reference to
> `QWidget::windowActivationChange(bool)'
> moc_mainwindow.o:(.data.rel.ro._ZTV10MainWindow[vtable for
> MainWindow]+0xd8): undefined reference to `QWidget::languageChange()'
> 
> Any idea on how to fix it?

In your .pro file, make sure you have:

QT += widget
-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center
     Intel Sweden AB - Registration Number: 556189-6027
     Knarrarnäsgatan 15, 164 40 Kista, Stockholm, Sweden