CODEWITHSUNDEEP
c++qtundefined-referencemultiple-definition-errormigrating
Victor
Victor

Reputation: 941

multiple definition of QString::fromUtf8 and undefined references

I am migrating a huge project from Qt4.x to Qt5. Right now I am having this issue that I can't solve:

C:\Qt5\5.2.1\mingw48_32\lib/libQt5Core.a(d003170.o):(.text+0x0): multiple definition of `QString::fromUtf8(char const*, int)'
./release\aisinfowidget.o:aisinfowidget.cpp:(.text$_ZN7QString8fromUtf8EPKci[__ZN7QString8fromUtf8EPKci]+0x0): first defined here
./release\gpssettingswidget.o:gpssettingswidget.cpp:(.text+0x4dcc): undefined reference to `QtAddOn::SerialPort::SerialPortInfo::availablePorts()'
./release\gpssettingswidget.o:gpssettingswidget.cpp:(.text+0x4e3e): undefined reference to `QtAddOn::SerialPort::SerialPortInfo::portName() const'
./release\gpssettingswidget.o:gpssettingswidget.cpp:(.text+0x4e5d): undefined reference to `QtAddOn::SerialPort::SerialPortInfo::description() const'
c:/mingw/bin/../lib/gcc/mingw32/4.8.1/../../../../mingw32/bin/ld.exe: ./release\gpssettingswidget.o: bad reloc address 0xd in section `.text$_ZN25Ui_GPSSettingsWidgetClass13retranslateUiEP14SettingsWidget[__ZN25Ui_GPSSettingsWidgetClass13retranslateUiEP14SettingsWidget]'
collect2.exe: error: ld returned 1 exit status

Upvotes: 1

Views: 1118

Answers (1)

Tay2510
Tay2510

Reputation: 5978

I saw you are using third party library QtSerialPort and QextSerialPort. Lucky you, I've been struggling with these two lovely guys these days.

The errors QString::fromUtf8 "possibly" come from the macro QStringLiteral defined in qserialportglobal.h

#ifndef QStringLiteral
#define QStringLiteral(str) QString::fromUtf8(str)
#endif

P.S. I am using Qt 4.8.5, there might be some difference.

In your gpssettingswidget.cpp, you don't have to include qserialportglobal.h again since it has been included in QSerialPort.

Remove the inclusion and see if it gets better, I know it's an arduous work to deal those multiple errors, and this answer definitely not the final remedy.

At least see what changes, and we can discuss here.

[Edit] I saw you are using Qwt too, I had a problem when using Qwt and QtSerialPort together. The question is here and has not yet been solved. I bypassed the conflict by migrating to QextSerialPort. There might be some library conflict, I doubt.

It seems that only Laszlo Papp can save your ass (He is one of the author of QtSerialPort)

Upvotes: 1

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