Undefined reference to vtable. Trying to compile a Qt project
c++, qmake, qt
Solution
Warning: Do not do this if you already have a .pro file - you'll lose it!
In order to automatically ensure that all moc cpp files are generated, you can get qmake to automatically generate a .pro file for you instead of writing one yourself.
Run
qmake -project
in the project directory, and qmake will scan your directory for all C++ headers and source files to generate moc cpp files for.
Problem
I'm using Code::Blocks 8.02 and the mingw 5.1.6 compiler. I'm getting this error when I compile my Qt project: C:\Documents and Settings\The Fuzz\Desktop\GUI\App_interface.cpp|33|undefined reference to `vtable for AddressBook' File AddressBook.h: ``` #ifndef ADDRESSBOOK_H #define ADDRESSBOOK_H #include <QWidget> class QLabel; class QLineEdit; class QTextEdit; class AddressBook : public QWidget { Q_OBJECT public: AddressBook(QWidget *parent = 0); private: QLineEdit *nameLine; QTextEdit *addressText; }; #endif ``` File AddressBook.cpp: ``` #include <QtGui> #include "addressbook.h" AddressBook::AddressBook(QWidget *parent) : QWidget(parent) { QLabel *nameLabel = new QLabel(tr("Name:")); nameLine = new QLineEdit; QLabel *addressLabel = new QLabel(tr("Address:")); addressText = new QTextEdit; QGridLayout *mainLayout = new QGridLayout; mainLayout->addWidget(nameLabel, 0, 0); mainLayout->addWidget(nameLine, 0, 1); mainLayout->addWidget(addressLabel, 1, 0, Qt::AlignTop); mainLayout->addWidget(addressText, 1, 1); setLayout(mainLayout); setWindowTitle(tr("Simple Address Book")); } ```