Compile Error: "Undefined reference to" Constructor

Dong

Hi Everyone

I got this strange Compile Error when build my project in Qt 5.4.2 on Windows
when I compile the Application which use a library

But it build OK on Qt 5.7

error: undefined reference to `PropertyToCsvSetting::PropertyToCsvSetting(QString, QString, QString, QString, int)'

The line where this error reported is inside the library it self.
but when I compile the library, it compile OK.

This is the line where error occurred

    result.append(PropertyToCsvSetting(sObjType, "Name", "Name"));
    result.append(PropertyToCsvSetting(sObjType, "Status", "Status"));
    result.append(PropertyToCsvSetting(sObjType, "Objective", "Objective"));
    result.append(PropertyToCsvSetting(sObjType, "Comment", "Comment Text"));

This is my class .h file

#ifndef PROPERTYTOCSVSETTING_H
#define PROPERTYTOCSVSETTING_H

#include <QObject>
#include <QString>

class PropertyToCsvSetting
{
public:
    PropertyToCsvSetting();
    PropertyToCsvSetting(QString objectType, QString propertyName, QString csvColumnName, QString stringFormat = "", int index = 0);

    QString ObjectType;
    QString PropertyName;
    QString CsvColumnName;
    QString StringFormat;
    int Index;
};

#endif // PROPERTYTOCSVSETTING_H

This is .cpp file

#include "propertytocsvsetting.h"

PropertyToCsvSetting::PropertyToCsvSetting()
{

}

PropertyToCsvSetting::PropertyToCsvSetting(QString objectType, QString propertyName, QString csvColumnName, QString stringFormat, int index)
{
    ObjectType = objectType;
    PropertyName = propertyName;
    CsvColumnName = csvColumnName;
    StringFormat = stringFormat;
    Index = index;
}

Any help will be very appreciate !

jsulm

@Dong Are you linking against that library?
You get such errors if you forget to link against a library containing the reference.

Dong

@jsulm
It already linked

# Link to CommonBusiness
win32:CONFIG(release, debug|release): LIBS += -L$$OUT_PWD/../Business/CommonBusiness/release/ -lCommonBusiness
else:win32:CONFIG(debug, debug|release): LIBS += -L$$OUT_PWD/../Business/CommonBusiness/debug/ -lCommonBusiness
else:unix: LIBS += -L$$OUT_PWD/../Business/CommonBusiness/ -lCommonBusiness

INCLUDEPATH += $$PWD/../Business/CommonBusiness
DEPENDPATH += $$PWD/../Business/CommonBusiness

win32-g++:CONFIG(release, debug|release): PRE_TARGETDEPS += $$OUT_PWD/../Business/CommonBusiness/release/libCommonBusiness.a
else:win32-g++:CONFIG(debug, debug|release): PRE_TARGETDEPS += $$OUT_PWD/../Business/CommonBusiness/debug/libCommonBusiness.a
else:win32:!win32-g++:CONFIG(release, debug|release): PRE_TARGETDEPS += $$OUT_PWD/../Business/CommonBusiness/release/CommonBusiness.lib
else:win32:!win32-g++:CONFIG(debug, debug|release): PRE_TARGETDEPS += $$OUT_PWD/../Business/CommonBusiness/debug/CommonBusiness.lib
else:unix: PRE_TARGETDEPS += $$OUT_PWD/../Business/CommonBusiness/libCommonBusiness.a

Dong

Here is the Compile Output:

windres -i [Application-Name]_resource.rc -o debug\[Application-Name]_resource_res.o --include-dir=. -DUNICODE -DQT_QML_DEBUG -DQT_DECLARATIVE_DEBUG -DQT_QUICK_LIB -DQT_WEBKITWIDGETS_LIB -DQT_WIDGETS_LIB -DQT_WEBKIT_LIB -DQT_GUI_LIB -DQT_QML_LIB -DQT_XMLPATTERNS_LIB -DQT_NETWORK_LIB -DQT_SQL_LIB -DQT_XML_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN
g++ -Wl,-subsystem,windows -mthreads -o debug\[Application-Name].exe object_script.[Application-Name].Debug  -lglu32 -lopengl32 -lgdi32 -luser32 -lmingw32 -LC:/Qt/Qt5.4.2/5.4/mingw491_32/lib -lqtmaind -LC:\mingw491\mingw32\lib -LC:\Utils\icu32_53_1_mingw482\lib -LC:\utils\postgresql\pgsql\lib -LC:\utils\mysql\mysql\lib -LC:\opensll\lib -lshell32 -LC:\Qt\Qt5.4.2\5.4\mingw491_32/lib "-L[Build-Path]Presentation/../Business/ServiceBusiness/debug/" -lServiceBusiness "-L[Build-Path]Presentation/../Services/SearchServices/debug/" -lSearchServices "-L[Build-Path]Presentation/../Services/Service/debug/" -lService "-L[Build-Path]Presentation/../Framework/Core/debug/" -lCore "-L[Build-Path]Presentation/../Framework/Utilities/debug/" -lUtilities "-L[Build-Path]Presentation/../Framework/SystemConst/debug/" -lSystemConst "-L[Build-Path]Presentation/../Framework/DynamicObjectCore/debug/" -lDynamicObjectCore "-L[Build-Path]Presentation/../Framework/DynamicObjectORM/debug/" -lDynamicObjectORM "-L[Build-Path]Presentation/../DatabaseEngine/debug/" -lDatabaseEngine "-L[Build-Path]Presentation/../Business/CommonBusiness/debug/" -lCommonBusiness -lQt5Quickd -lQt5WebKitWidgetsd -lQt5Widgetsd -lQt5WebKitd -lQt5Guid -lQt5Qmld -lQt5XmlPatternsd -lQt5Networkd -lQt5Sqld -lQt5Xmld -lQt5Cored debug\[Application-Name]_resource_res.o 
[Build-Path]Presentation/../Business/CommonBusiness/debug//libCommonBusiness.a(commonbusiness.o): In function `ZN14CommonBusiness25getPropertyCampaignsToCsvEb':
[Build-Path]Business\CommonBusiness/../../../Business/CommonBusiness/commonbusiness.cpp:1342: undefined reference to `PropertyToCsvSetting::PropertyToCsvSetting(QString, QString, QString, QString, int)'
[Build-Path]Business\CommonBusiness/../../../Business/CommonBusiness/commonbusiness.cpp:1343: undefined reference to `PropertyToCsvSetting::PropertyToCsvSetting(QString, QString, QString, QString, int)'
[Build-Path]Business\CommonBusiness/../../../Business/CommonBusiness/commonbusiness.cpp:1344: undefined reference to `PropertyToCsvSetting::PropertyToCsvSetting(QString, QString, QString, QString, int)'
[Build-Path]Business\CommonBusiness/../../../Business/CommonBusiness/commonbusiness.cpp:1345: undefined reference to `PropertyToCsvSetting::PropertyToCsvSetting(QString, QString, QString, QString, int)'
[Build-Path]Business\CommonBusiness/../../../Business/CommonBusiness/commonbusiness.cpp:1346: undefined reference to `PropertyToCsvSetting::PropertyToCsvSetting(QString, QString, QString, QString, int)'
[Build-Path]Presentation/../Business/CommonBusiness/debug//libCommonBusiness.a(commonbusiness.o):[Build-Path]Business\CommonBusiness/../../../Business/CommonBusiness/commonbusiness.cpp:1347: more undefined references to `PropertyToCsvSetting::PropertyToCsvSetting(QString, QString, QString, QString, int)' follow
collect2.exe: error: ld returned 1 exit status

VRonin

Looks like you did not export PropertyToCsvSetting from your library

Dong

@VRonin
I don't know what you mean...

The problem is: It compile OK on QT creator 5.7

jsulm

@Dong You should read this: http://doc.qt.io/qt-5.7/sharedlibrary.html

VRonin

@Dong said in Compile Error: "Undefined reference to" Constructor:

It compile OK on QT creator 5.7

Ok, sorry, I missed that part. Did you build the library with Qt 5.4.2?

Dong

@VRonin
Yes !
all project are in the same SubDir Project

VRonin

So, I guess the library is static. could you post the 3 .pro files please?

kshegunov

Reran qmake and did a full rebuild?

Dong

Dear All: here is my situation

The class which cause compile Error is PropertyColumnMapping in DynamicObjectCore.pro
Then CommonBusiness.pro using this class
And Presentation linked to both CommonBusiness.pro & DynamicObjectCore.pro

Clean + QMake + Rebuild doesn't work.

Here is my Project Structure.

Application.pro
TEMPLATE = subdirs
CONFIG += ordered

SUBDIRS +=
Framework
Services
Business
Presentation
Updater

QT += qml quick widgets network sql xml

Business.pro
TEMPLATE = subdirs

SUBDIRS +=
CommonBusiness
ServiceBusiness

//Link to Framework.System

CommonBusiness.pro
QT -= gui
QT += qml quick sql xml xmlpatterns network

TARGET = CommonBusiness
TEMPLATE = lib
CONFIG += staticlib c++11

SOURCES += commonbusiness.cpp
...

HEADERS += commonbusiness.h
...

//# Link to FrameWork.DynamicObjectCore

DynamicObjectCore.pro
QT -= gui
QT += qml

TARGET = DynamicObjectCore
TEMPLATE = lib
CONFIG += staticlib c++11
#DEFINES += DYNAMICOBJECTCORE_LIBRARY

SOURCES +=
MetadataModel/propertycolumnmapping.cpp
...

HEADERS +=
MetadataModel/propertycolumnmapping.h
...
unix {
target.path = /usr/lib
INSTALLS += target
}

Presentation.pro
TEMPLATE = app

TARGET = [ApplicationName]

QT += qml quick widgets network sql xml xmlpatterns

//# for QT 5.4
qtHaveModule(webengine) {
QT += webengine
DEFINES += QT_WEBVIEW_WEBENGINE_BACKEND
}

qtHaveModule(webkitwidgets) {
QT += webkitwidgets
}

//# for QT 5.7
equals(QT_VERSION, QT_VERSION_CHECK(5, 7, 0)) {
QT += webview
DEFINES += QT_WEBVIEW_CONTROL_BACKEND
}

CONFIG += c++11

CONFIG(release, debug|release) {
CONFIG += release force_debug_info
}
RESOURCES += qml.qrc
shared.qrc

//# Link to DynamicObjectCore
//# Link to CommonBusiness