please help with linker errors

[jimboqt]

Hi all,

I'm fairly new to Qt. I'm trying to compile my example plugin and I'm getting the following linker errors: -

release\exampleimportplugin.o(.text+0x4f):examplei mportplugin.cpp: undefined reference to `CPIImportImplementation::signal_newStep(unsigned int)'
release\exampleimportplugin.o(.text+0x81):examplei mportplugin.cpp: undefined reference to `CPIImportImplementation::signal_newSubStep(QStrin g const&)'
release\exampleimportplugin.o(.text+0xda):examplei mportplugin.cpp: undefined reference to `CPIImportImplementation::signal_newSubStep(QStrin g const&)'
release\exampleimportplugin.o(.text+0x114):example importplugin.cpp: undefined reference to `CPIImportImplementation::signal_newStep(unsigned int)'
release\exampleimportplugin.o(.text+0x146):example importplugin.cpp: undefined reference to `CPIImportImplementation::signal_newSubStep(QStrin g const&)'
release\exampleimportplugin.o(.text+0x19f):example importplugin.cpp: undefined reference to `CPIImportImplementation::signal_newSubStep(QStrin g const&)'
release\exampleimportplugin.o(.text+0x1f8):example importplugin.cpp: undefined reference to `CPIImportImplementation::signal_newSubStep(QStrin g const&)'
release\exampleimportplugin.o(.text+0x237):example importplugin.cpp: undefined reference to `CPIImportImplementation::signal_newStep(unsigned int)'
release\exampleimportplugin.o(.text+0x264):example importplugin.cpp: undefined reference to `CPIImportImplementation::signal_newSubStep(QStrin g const&)'
release\exampleimportplugin.o(.text+0x2bd):example importplugin.cpp: undefined reference to `CPIImportImplementation::signal_newSubStep(QStrin g const&)'
release\exampleimportplugin.o(.text+0x316):example importplugin.cpp: undefined reference to `CPIImportImplementation::signal_newSubStep(QStrin g const&)'
release\exampleimportplugin.o(.text+0x36f):example importplugin.cpp: undefined reference to `CPIImportImplementation::signal_newSubStep(QStrin g const&)'
release\exampleimportplugin.o(.text+0x600):example importplugin.cpp: undefined reference to `vtable for CPIImportImplementation'
release\exampleimportplugin.o(.text+0xf0e):example importplugin.cpp: undefined reference to `vtable for CPIImportImplementation'
release\exampleimportplugin.o(.text+0x1420):exampl eimportplugin.cpp: undefined reference to `vtable for CPIImportImplementation'
release\exampleimportplugin.o(.text+0x1d2e):exampl eimportplugin.cpp: undefined reference to `vtable for CPIImportImplementation'
release\moc_exampleimportplugin.o(.text+0xe2):moc_ exampleimportplugin.cpp: undefined reference to `CPIImportImplementation::qt_metacall(QMetaObject: :Call, int, void**)'
release\moc_exampleimportplugin.o(.text+0x9d):moc_ exampleimportplugin.cpp: undefined reference to `CPIImportImplementation::qt_metacast(char const*)'
release\moc_exampleimportplugin.o(.rdata+0x0):moc_ exampleimportplugin.cpp: undefined reference to `CPIImportImplementation::staticMetaObject'
release\moc_exampleimportplugin.o(.text$_ZN19Examp leImportPluginD1Ev[ExampleImportPlugin::~ExampleImportPlugin()]+0x183):moc_exampleimportplugin.cpp: undefined reference to `vtable for CPIImportImplem
entation'
release\moc_exampleimportplugin.o(.text$_ZN19Examp leImportPluginD1Ev[ExampleImportPlugin::~ExampleImportPlugin()]+0x39c):moc_exampleimportplugin.cpp: undefined reference to `vtable for CPIImportImplem
entation'
release\moc_exampleimportplugin.o(.text$_ZN19Examp leImportPluginD0Ev[ExampleImportPlugin::~ExampleImportPlugin()]+0x183):moc_exampleimportplugin.cpp: undefined reference to `vtable for CPIImportImplem
entation'
release\moc_exampleimportplugin.o(.text$_ZN19Examp leImportPluginD0Ev[ExampleImportPlugin::~ExampleImportPlugin()]+0x3ac):moc_exampleimportplugin.cpp: undefined reference to `vtable for CPIImportImplem
entation'
collect2: ld returned 1 exit status

I've cleaned the project, then I'm using qmake, then mingw32-make. Here's my .pro file:

TEMPLATE = lib
CONFIG += plugin
TARGET = example
DESTDIR = ../../../../bin/importers
DEPENDPATH += .
INCLUDEPATH += ../../../../include
 
# Input
HEADERS += exampleimportplugin.h
SOURCES += exampleimportplugin.cpp

TEMPLATE = lib
CONFIG += plugin
TARGET = example
DESTDIR = ../../../../bin/importers
DEPENDPATH += .
INCLUDEPATH += ../../../../include

# Input
HEADERS += exampleimportplugin.h
SOURCES += exampleimportplugin.cpp

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Here's the code:

ExampleImportPlugin.h:

#include <QtPlugin>
#include <CPIImportDescriptor.h> // in include path
#include <CPIImportImplementation.h> // in include path
 
class ExampleImportPlugin : public CPIImportDescriptor, public CPIImportImplementation
{
	Q_OBJECT
	Q_INTERFACES(CPIImportDescriptor CPIImportImplementation)
public:
	...
private:
	...
};

#include <QtPlugin>
#include <CPIImportDescriptor.h> // in include path
#include <CPIImportImplementation.h> // in include path

class ExampleImportPlugin : public CPIImportDescriptor, public CPIImportImplementation
{
	Q_OBJECT
	Q_INTERFACES(CPIImportDescriptor CPIImportImplementation)
public:
	...
private:
	...
};

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ExampleImportPlugin.cpp:

#include "exampleimportplugin.h"
 
ExampleImportPlugin::ExampleImportPlugin()
{
	...
}
 
bool ExampleImportPlugin::go()
{
	...
}
 
Q_EXPORT_PLUGIN2( example, ExampleImportPlugin );

#include "exampleimportplugin.h"

ExampleImportPlugin::ExampleImportPlugin()
{
	...
}

bool ExampleImportPlugin::go()
{
	...
}

Q_EXPORT_PLUGIN2( example, ExampleImportPlugin );

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CPIImportImplementation.h:

#include <QObject>
#include <QList>
#include <QString>
 
class CPIImportImplementation : public QObject
{
	Q_OBJECT
public:
	CPIImportImplementation()
	 : myIsCancelled( false )
	{
	}
	virtual bool go() = 0;
	virtual ~CPIImportImplementation() {}
 
	bool isCancelled() { return myIsCancelled; }
	QString status() { return myStatus; }
	QList<QString> & steps() { return mySteps; }
 
public slots:
	void slot_cancelled() { myIsCancelled = true; }
 
signals:
	void signal_newStep( const unsigned int numSubSteps );
	void signal_setStep( const unsigned int step, const unsigned int numSubSteps );
	void signal_newSubStep( const QString & status );
	void signal_setSubStep( const unsigned int step, const QString & status );
protected:
	QList<QString> mySteps;
	QString myStatus;
private:
	bool myIsCancelled;
};
 
Q_DECLARE_INTERFACE( CPIImportImplementation, "co.uk.cabos.Plugin.CPIImportImplementation/1.0" );

#include <QObject>
#include <QList>
#include <QString>

class CPIImportImplementation : public QObject
{
	Q_OBJECT
public:
	CPIImportImplementation()
	 : myIsCancelled( false )
	{
	}
	virtual bool go() = 0;
	virtual ~CPIImportImplementation() {}

	bool isCancelled() { return myIsCancelled; }
	QString status() { return myStatus; }
	QList<QString> & steps() { return mySteps; }

public slots:
	void slot_cancelled() { myIsCancelled = true; }

signals:
	void signal_newStep( const unsigned int numSubSteps );
	void signal_setStep( const unsigned int step, const unsigned int numSubSteps );
	void signal_newSubStep( const QString & status );
	void signal_setSubStep( const unsigned int step, const QString & status );
protected:
	QList<QString> mySteps;
	QString myStatus;
private:
	bool myIsCancelled;
};

Q_DECLARE_INTERFACE( CPIImportImplementation, "co.uk.cabos.Plugin.CPIImportImplementation/1.0" );

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CPIImportDescriptor.h:

#include <QObject>
 
class CPIImportDescriptor
{
public:
	...
protected:
	...
private:
	...
};
 
Q_DECLARE_INTERFACE( CPIImportDescriptor, "CABOS.Plugin.CPIImportDescriptor/1.0" );

#include <QObject>

class CPIImportDescriptor
{
public:
	...
protected:
	...
private:
	...
};

Q_DECLARE_INTERFACE( CPIImportDescriptor, "CABOS.Plugin.CPIImportDescriptor/1.0" );

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Any ideas what I'm doing wrong?

Many thanks,

jimbo

[wysota]

You forgot to include CPIImportImplementation.h in your .pro file. Therefore it is not moced and the meta object for it is not created.