Link error in test unit with QOBJECT macro

CHPOG

Hi all,

I have created a dll project. This one build without errors.
I want to test this dll so I create a QtTest class.
But when I try to build the unit test .pro I get the following errors :

tst_testsconnection.obj : error LNK2001: symbole externe non résolu "public: virtual void * __cdecl QSerialPort::`scalar deleting destructor'(unsigned int)" (??_GQSerialPort@@UEAAPEAXI@Z)
tst_testsconnection.obj : error LNK2001: symbole externe non résolu "public: virtual void * __cdecl QSerialPort::`vector deleting destructor'(unsigned int)" (??_EQSerialPort@@UEAAPEAXI@Z)

In my Dll I have a class who uses QSerialPort. But I have no issue on how to fix this link error.
If I remove the QOBJECT macro and the signals/slot part there is no more any link errors.
My dll project was created using QtCreator wizard.

Below the .h of my class in the dll :

#ifndef RS232UNIWHEEL_H
#define RS232UNIWHEEL_H

#include "connectionlibrary_global.h"

#include <QObject>
#include <QtSerialPort/QSerialPort>

class CONNECTIONLIBRARYSHARED_EXPORT RS232UniWheel : public QObject
{
    Q_OBJECT

public:
    RS232UniWheel();
    ~RS232UniWheel();
    void open();
    bool isOpen();
    void close();
    void writeList();
    void writeStart();
    void writeStop();
    QByteArray readAll();
    QString getError();

signals:
    void errorOccurred(QSerialPort::SerialPortError error);
    void readyRead();

public slots:
    void readData();
    void handleError(QSerialPort::SerialPortError error);

private :
    QSerialPort m_serial;

};

#endif // RS232UNIWHEEL_H

All these are quite simple usage of Qt code.

If anyone has an idea ??

Thanks.

CHPOG

Thanks @SGaist. This is solved by change compiler and used Mingw instead of MSVC.

Christian Ehrlicher

@CHPOG said in Link error in test unit with QOBJECT macro:

~RS232UniWheel();

Did you actually implement this ctor?

Pl45m4

@CHPOG said in Link error in test unit with QOBJECT macro:

tst_testsconnection.obj : error LNK2001: symbole externe non résolu "public: virtual void * __cdecl QSerialPort::`scalar deleting destructor'(unsigned int)" (??_GQSerialPort@@UEAAPEAXI@Z)
tst_testsconnection.obj : error LNK2001: symbole externe non résolu "public: virtual void * __cdecl QSerialPort::`vector deleting destructor'(unsigned int)" (??_EQSerialPort@@UEAAPEAXI@Z)

Is QtSerialPort included in your project file?
(https://stackoverflow.com/questions/20044185/qt-linker-error-when-adding-class-to-basic-qt-gui-application)

Check if all functions / slots are implemented in your cpp files.
Try a cleanup and qmake / build again

CHPOG

@Christian-Ehrlicher
Yes I try but no more successfull. And the link error is on the destructor of QSerialPort not Rs232UniWhelll one.

@Pl45m4
Yes I had QT += serialport in my .pro file.
Before I forgot to add it but I had much more link error.
All functions/slots are implemented in my cpp files.
And I also try to delete the build directory and do a new build.

SGaist

Hi,

What compiler are you using ?
What version of Qt are you building your test with ?

CHPOG

@SGaist
I use QtCreator 4.9.2.
I don't really know which compiler I use. I just click on the Rebuild popup menu in the project.
After take a look I used MSVC compiler and want to use Mingw. But when changing to mingw compilation failed, this is an other issue when I want to emit signals I have a undefined reference

/ConnectionLibrary/RS232UniWheel.cpp:16: undefined reference to `RS232UniWheel::errorOccurred(QSerialPort::SerialPortError)'

void RS232UniWheel::handleError(QSerialPort::SerialPortError error) {
    emit errorOccurred(error);
}

CHPOG

Thanks @SGaist. This is solved by change compiler and used Mingw instead of MSVC.