Problems porting Qt 4.7 Project to 5.0 PRO Files and LIB

Grisu

Hi,

last Weekend I started porting my Qt 4 project to version 5.0. Besides a lot of obsolet functions that I had to replace I've got another big problem.

While compiling I'm getting Link jom errors. For Example:

XMLBuch.obj:-1: Fehler:LNK2001: Nicht aufgelöstes externes Symbol ""public: static struct QMetaObject const Medium::staticMetaObject" (?staticMetaObject@Medium@@2UQMetaObject@@B)".

Till this day I used mingw, I installed VS2010 express with SP1 and the new QT SDK.
Do I have to change more then the "LIB"-Statement in the Amazon.Pro File?

Hope some can help me :-)

Happy New Year to everyone,

Grisu

This is my Main PRO File:
@
TEMPLATE=subdirs

CONFIG += ordered
SUBDIRS += DataObjects
SUBDIRS += Amazon
SUBDIRS += SQL
SUBDIRS += Userinterfaces
SUBDIRS += Main

DESTDIR = ./release@

This is the DataObjects PRO File:

@TEMPLATE = lib
CONFIG += dll
qt
QT += core
sql
widgets
HEADERS += Ausleihe.h
Buch.h
...
SOURCES += Ausleihe.cpp
Buch.cpp
...
DEFINES += BUILD_DLL
DESTDIR = ../Release
@

This is Amazon PRO File
@
TEMPLATE = lib
CONFIG += dll
qt
QT += core
widgets
network
xml
gui
sql
HEADERS += XMLBuch.h
HttpData.h
bookquerry.h
sha2.h
hmac_sha2.h
XMLCD.h
xmldvd.h
SOURCES += XMLBuch.cpp
HttpData.cpp
bookquerry.cpp
XMLCD.cpp
sha2.c
hmac_sha2.c
xmldvd.cpp
FORMS += ui/bookquerry.ui
DEFINES += BUILD_DLL
DESTDIR = ../Release

Old 4.7: LIBS += "../Release/libDataObjects.a"

LIBS += "../Release/DataObjects.lib"
UI_DIR = ../../MediaMaster/Amazon/ui
@

This is a sniped from Medium.h File which is Part of DataObjects:

@#ifndef MEDIUM_H_
#define MEDIUM_H_

#ifdef BUILD_DLL
#define EXPORT_DLL Q_DECL_EXPORT
#else
#define EXPORT_DLL
#endif

#include "Objektverwalter.h"
#include "../SQL/SQLBase.h"
#include "SpracheListe.h"

#include <QDate>

class EXPORT_DLL Medium: public QObject,
public Objektverwalter,
public SQLBase
{
Q_OBJECT
public:
Medium(QObject *parent =0);
virtual ~Medium();@

ChrisW67

At a guess you have a missing Q_OBJECT macro or have not re-run qmake since adding it. The missing object is generated by moc.

If you use this form of the LIBS variable you allow Qt and your linker to worry about "correct" library naming.

@
LIBS += -L../Release -lDataObjects
@

Popugaj

i've also downloaded Qt5-VisualStudio2010 and facing the same problem when porting Qt4 to Qt5: http://qt-project.org/forums/viewthread/23253/

everything is 'unresolved external symbol', how strange!

Grisu

Both tips don't work :-(.
I don't think that a QObject is missing because it works fine in Qt4.

I will build a sample project and try it with that one.

By the way these are the Qmake settings:
qmake.exe C:\Temp\MediaMaster\MediaMaster.pro -r -spec win32-msvc2010 "CONFIG+=debug" "CONFIG+=declarative_debug" "CONFIG+=qml_debug"

Grisu

Hi
I just build an micro project:
http://dl.dropbox.com/u/16466900/Test.zip
two Pro Files in each case one Class.

And still the same problem:
XMLBuch.obj : error LNK2001: Nicht aufgelöstes externes Symbol ""public: static struct QMetaObject const Medium::staticMetaObject" (?staticMetaObject@Medium@@2UQMetaObject@@B)".

I think its a Qreator or VS settings Problem

Test.pro:
@
TEMPLATE=subdirs

CONFIG += ordered
SUBDIRS += DataObjects
SUBDIRS += Amazon
DESTDIR = ./release
@

DataObjects.pro
@
TEMPLATE = lib
CONFIG += dll
qt
QT += core
sql
widgets
HEADERS += Medium.h
SOURCES += Medium.cpp
DEFINES += BUILD_DLL
DESTDIR = ../Release
@

Medium.h
@#ifndef MEDIUM_H_
#define MEDIUM_H_

#ifdef BUILD_DLL
#define EXPORT_DLL Q_DECL_EXPORT
#else
#define EXPORT_DLL
#endif
#include <QObject>

class EXPORT_DLL Medium: public QObject
{
Q_OBJECT
public:
Medium(QObject *parent =0);
virtual ~Medium();

void setURL(QString strURL);
QString getURL();
private:
QString m_strURL;
};

#endif /MEDIUM_H_/
@

Medium.cpp
@#include "Medium.h"
#include <QObject>
#include <QString>

Medium::Medium(QObject *parent):QObject(parent){
}

Medium::~Medium(){
}

void Medium::setURL(QString strURL){
m_strURL = strURL;
}
QString Medium::getURL(){
return m_strURL;
}@

Amazon.pro
@TEMPLATE = lib
CONFIG += dll
qt
QT += core
widgets
network
xml
gui
sql
HEADERS += XMLBuch.h
SOURCES += XMLBuch.cpp
DEFINES += BUILD_DLL
DESTDIR = ../Release
LIBS += -L../Release -lDataObjects
@

XMLBuch.h
@#ifndef XMLBUCH_H_
#define XMLBUCH_H_

#ifdef BUILD_DLL
#define EXPORT_DLL Q_DECL_EXPORT
#else
#define EXPORT_DLL
#endif

#include <QByteArray>

class EXPORT_DLL XMLBuch
{
public:
XMLBuch(QByteArray xmlText);
virtual ~XMLBuch();
};

#endif /XMLBUCH_H_/
@

XMLBuch.cpp
@#include "XMLBuch.h"

#include "../DataObjects/Medium.h"
XMLBuch::XMLBuch(QByteArray xmlText){
Medium med;
med.setURL("Dummy");
}

XMLBuch::~XMLBuch(){
}

@

ChrisW67

Your test project builds just fine on my Linux box with Qt 4.8.4. In a MSVC/Qt command prompt try the basic clean build:
@
qmake
nmake
@

If that works (I expect it will) then the problem is in what your VS project is running to build your project. Make sure that moc is being run by VS.

Grisu

Hi,
I'm using Qt Creator 2.6.1.
I never comiled my Project with command prompt.
I'll try it when I'm at home.

Grisu

Grisu

Hi,

I started "Qt 5.0.0 for Desktop (MSVC 2010)" Command prompt.
With these commands:
"C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\vcvarsall.bat" x86
qmake
nmake

And still an error:
"c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\BIN\nmake.exe" -
f Makefile.Release

    cl -c -nologo -Zm200 -Zc:wchar_t -O2 -MD -GR -W3 -w34100 -w34189 -EHsc -

DUNICODE -DWIN32 -DBUILD_DLL -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_OPENG
L_ES_2 -DQT_OPENGL_ES_2_ANGLE -I"......\Qt\Qt5.0.0\5.0.0\msvc2010\include" -I"
......\Qt\Qt5.0.0\5.0.0\msvc2010\include\QtGui" -I"......\Qt\Qt5.0.0\5.0.0\m
svc2010\include\QtCore" -I"release" -I"......\Qt\Qt5.0.0\5.0.0\msvc2010\mkspec
s\win32-msvc2010" -Forelease\ @C:\Users\Grisu\AppData\Local\Temp\nmF3D0.tmp
XMLBuch.cpp
link /NOLOGO /DYNAMICBASE /NXCOMPAT /INCREMENTAL:NO /DLL /MANIFEST /MANI
FESTFILE:..\Release\Amazon.dll.embed.manifest /OUT:..\Release\Amazon.dll @C:\Use
rs\Grisu\AppData\Local\Temp\nmF5A5.tmp
Bibliothek "..\Release\Amazon.lib" und Objekt "..\Release\Amazon.exp" werden
erstellt.
XMLBuch.obj : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol ""pub
lic: static struct QMetaObject const Medium::staticMetaObject" (?staticMetaObjec
t@Medium@@2UQMetaObject@@B)" in Funktion ""public: static class QString __cdecl
Medium::tr(char const *,char const *,int)" (?tr@Medium@@SA?AVQString@@PBD0H@Z)".

..\Release\Amazon.dll : fatal error LNK1120: 1 nicht aufgelöste externe Verweise
.
NMAKE : fatal error U1077: ""c:\Program Files (x86)\Microsoft Visual Studio 10.0
\VC\BIN\link.EXE"": Rückgabe-Code "0x460"
Stop.
NMAKE : fatal error U1077: ""c:\Program Files (x86)\Microsoft Visual Studio 10.0
\VC\BIN\nmake.exe"": Rückgabe-Code "0x2"
Stop.
NMAKE : fatal error U1077: "cd": Rückgabe-Code "0x2"
Stop.

Grisu

Sorry that I pop-up this topic again.
Yesterday evening I Installed the XP Mode on my Windows 7 PC.
Next step was installing MSVS C++ 2010 and then the qt 5.0.0 vs2010 SDK.

I started the Creator and build the project,..... same Problem

Do I have to do something else, because ChrisW67 wrote that the Code is correct.

Hope someone can help me.

Grisu