QMake issue - vtable

Post by **ogee77** » Fri Oct 15, 2010 2:42 am

Hi, first I want to say that CodeLite is really a great piece of work! I' ve been using it for quite a time now and it only proves it self better and better with every new release (actually with every new commit

). I' ve been recently involved with Qt and wanted to set it up to work in CodeLite. However, the configuration gave me a hard time. When I try to compile a Qt which uses Q_OBJECT then 'undefined reference to vtable' occurs as if there were some virtual functions not implemented.

Build output:

----------Build Started--------
/bin/sh -c '"make" -j 2 -f "test_qt_wsp.mk"'
----------Building project:[ first3_qt - Debug ]----------
make[1]: Entering directory `/home/pawels/dev/test_qt/first3_qt'
make[1]: warning: -jN forced in submake: disabling jobserver mode.
/opt/qtsdk-2010.05/qt/bin/qmake -spec /opt/qtsdk-2010.05/qt/mkspecs/linux-g++ -o first3_qt.mk first3_qt.pro
make[1]: Leaving directory `/home/pawels/dev/test_qt/first3_qt'
make[1]: Entering directory `/home/pawels/dev/test_qt/first3_qt'
make[1]: warning: -jN forced in submake: disabling jobserver mode.
g++ -c -pipe -g -Wall -W -D_REENTRANT -DQT_GUI_LIB -DQT_CORE_LIB -I/opt/qtsdk-2010.05/qt/mkspecs/linux-g++ -I. -I/opt/qtsdk-2010.05/qt/include/QtCore -I/opt/qtsdk-2010.05/qt/include/QtGui -I/opt/qtsdk-2010.05/qt/include -I. -I. -o Debug/main.o main.cpp
g++ -Wl,-rpath,/opt/qtsdk-2010.05/qt/lib -o Debug/first3_qt Debug/main.o -L/opt/qtsdk-2010.05/qt/lib -lQtGui -lQtCore -lpthread
Debug/main.o: In function `AddressBook':
/home/pawels/dev/test_qt/first3_qt/main.cpp:21: undefined reference to `vtable for AddressBook'
/home/pawels/dev/test_qt/first3_qt/main.cpp:21: undefined reference to `vtable for AddressBook'
Debug/main.o: In function `~AddressBook':
/home/pawels/dev/test_qt/first3_qt/main.cpp:9: undefined reference to `vtable for AddressBook'
/home/pawels/dev/test_qt/first3_qt/main.cpp:9: undefined reference to `vtable for AddressBook'
collect2: ld returned 1 exit status
make[1]: *** [Debug/first3_qt] Error 1
make[1]: Leaving directory `/home/pawels/dev/test_qt/first3_qt'
make: *** [All] Error 2
----------Build Ended----------
0 errors, 0 warnings

My application is:

#include <QtGui>
#include <QWidget>

class QLabel;
class QLineEdit;
class QTextEdit;

class AddressBook : public QWidget
{
Q_OBJECT

public:
AddressBook(QWidget *parent = 0);
private:
QLineEdit *nameLine;
QTextEdit *addressText;
};

AddressBook::AddressBook(QWidget *parent)
: QWidget(parent)
{

}

int main(int argc, char *argv[])
{
QApplication app(argc, argv);

AddressBook addressBook;
addressBook.show();

return app.exec();
return 0;

}

Makefile:

#############################################################################
# Makefile for building: Debug/first3_qt
# Generated by qmake (2.01a) (Qt 4.7.0) on: Fri Oct 15 00:35:58 2010
# Project: first3_qt.pro
# Template: app
# Command: /opt/qtsdk-2010.05/qt/bin/qmake -spec /opt/qtsdk-2010.05/qt/mkspecs/linux-g++ -o first3_qt.mk first3_qt.pro
#############################################################################

####### Compiler, tools and options

CC = gcc
CXX = g++
DEFINES = -DQT_GUI_LIB -DQT_CORE_LIB
CFLAGS = -pipe -g -Wall -W -D_REENTRANT $(DEFINES)
CXXFLAGS = -pipe -g -Wall -W -D_REENTRANT $(DEFINES)
INCPATH = -I/opt/qtsdk-2010.05/qt/mkspecs/linux-g++ -I. -I/opt/qtsdk-2010.05/qt/include/QtCore -I/opt/qtsdk-2010.05/qt/include/QtGui -I/opt/qtsdk-2010.05/qt/include -I. -I.
LINK = g++
LFLAGS = -Wl,-rpath,/opt/qtsdk-2010.05/qt/lib
LIBS = $(SUBLIBS) -L/opt/qtsdk-2010.05/qt/lib -lQtGui -lQtCore -lpthread
AR = ar cqs
RANLIB =
QMAKE = /opt/qtsdk-2010.05/qt/bin/qmake
TAR = tar -cf
COMPRESS = gzip -9f
COPY = cp -f
SED = sed
COPY_FILE = $(COPY)
COPY_DIR = $(COPY) -r
STRIP = strip
INSTALL_FILE = install -m 644 -p
INSTALL_DIR = $(COPY_DIR)
INSTALL_PROGRAM = install -m 755 -p
DEL_FILE = rm -f
SYMLINK = ln -f -s
DEL_DIR = rmdir
MOVE = mv -f
CHK_DIR_EXISTS= test -d
MKDIR = mkdir -p

####### Output directory

OBJECTS_DIR = Debug/

####### Files

SOURCES = main.cpp
OBJECTS = Debug/main.o
DIST = /opt/qtsdk-2010.05/qt/mkspecs/common/g++.conf \
/opt/qtsdk-2010.05/qt/mkspecs/common/unix.conf \
/opt/qtsdk-2010.05/qt/mkspecs/common/linux.conf \
/opt/qtsdk-2010.05/qt/mkspecs/qconfig.pri \
/opt/qtsdk-2010.05/qt/mkspecs/modules/qt_webkit_version.pri \
/opt/qtsdk-2010.05/qt/mkspecs/features/qt_functions.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/qt_config.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/exclusive_builds.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/default_pre.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/debug.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/default_post.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/warn_on.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/resources.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/uic.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/yacc.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/lex.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/qt.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/unix/thread.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/moc.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/include_source_dir.prf \
first3_qt.pro
QMAKE_TARGET = first3_qt
DESTDIR = Debug/
TARGET = Debug/first3_qt

first: all
####### Implicit rules

.SUFFIXES: .o .c .cpp .cc .cxx .C

.cpp.o:
$(CXX) -c $(CXXFLAGS) $(INCPATH) -o "$@" "$<"

.cc.o:
$(CXX) -c $(CXXFLAGS) $(INCPATH) -o "$@" "$<"

.cxx.o:
$(CXX) -c $(CXXFLAGS) $(INCPATH) -o "$@" "$<"

.C.o:
$(CXX) -c $(CXXFLAGS) $(INCPATH) -o "$@" "$<"

.c.o:
$(CC) -c $(CFLAGS) $(INCPATH) -o "$@" "$<"

####### Build rules

all: first3_qt.mk $(TARGET)

$(TARGET): $(OBJECTS)
@$(CHK_DIR_EXISTS) Debug/ || $(MKDIR) Debug/
$(LINK) $(LFLAGS) -o $(TARGET) $(OBJECTS) $(OBJCOMP) $(LIBS)

first3_qt.mk: first3_qt.pro /opt/qtsdk-2010.05/qt/mkspecs/linux-g++/qmake.conf /opt/qtsdk-2010.05/qt/mkspecs/common/g++.conf \
/opt/qtsdk-2010.05/qt/mkspecs/common/unix.conf \
/opt/qtsdk-2010.05/qt/mkspecs/common/linux.conf \
/opt/qtsdk-2010.05/qt/mkspecs/qconfig.pri \
/opt/qtsdk-2010.05/qt/mkspecs/modules/qt_webkit_version.pri \
/opt/qtsdk-2010.05/qt/mkspecs/features/qt_functions.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/qt_config.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/exclusive_builds.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/default_pre.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/debug.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/default_post.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/warn_on.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/resources.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/uic.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/yacc.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/lex.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/qt.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/unix/thread.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/moc.prf \
/opt/qtsdk-2010.05/qt/mkspecs/features/include_source_dir.prf
$(QMAKE) -spec /opt/qtsdk-2010.05/qt/mkspecs/linux-g++ -o first3_qt.mk first3_qt.pro
/opt/qtsdk-2010.05/qt/mkspecs/common/g++.conf:
/opt/qtsdk-2010.05/qt/mkspecs/common/unix.conf:
/opt/qtsdk-2010.05/qt/mkspecs/common/linux.conf:
/opt/qtsdk-2010.05/qt/mkspecs/qconfig.pri:
/opt/qtsdk-2010.05/qt/mkspecs/modules/qt_webkit_version.pri:
/opt/qtsdk-2010.05/qt/mkspecs/features/qt_functions.prf:
/opt/qtsdk-2010.05/qt/mkspecs/features/qt_config.prf:
/opt/qtsdk-2010.05/qt/mkspecs/features/exclusive_builds.prf:
/opt/qtsdk-2010.05/qt/mkspecs/features/default_pre.prf:
/opt/qtsdk-2010.05/qt/mkspecs/features/debug.prf:
/opt/qtsdk-2010.05/qt/mkspecs/features/default_post.prf:
/opt/qtsdk-2010.05/qt/mkspecs/features/warn_on.prf:
/opt/qtsdk-2010.05/qt/mkspecs/features/resources.prf:
/opt/qtsdk-2010.05/qt/mkspecs/features/uic.prf:
/opt/qtsdk-2010.05/qt/mkspecs/features/yacc.prf:
/opt/qtsdk-2010.05/qt/mkspecs/features/lex.prf:
/opt/qtsdk-2010.05/qt/mkspecs/features/qt.prf:
/opt/qtsdk-2010.05/qt/mkspecs/features/unix/thread.prf:
/opt/qtsdk-2010.05/qt/mkspecs/features/moc.prf:
/opt/qtsdk-2010.05/qt/mkspecs/features/include_source_dir.prf:
qmake: FORCE
@$(QMAKE) -spec /opt/qtsdk-2010.05/qt/mkspecs/linux-g++ -o first3_qt.mk first3_qt.pro

dist:
@$(CHK_DIR_EXISTS) Debug/first3_qt1.0.0 || $(MKDIR) Debug/first3_qt1.0.0
$(COPY_FILE) --parents $(SOURCES) $(DIST) Debug/first3_qt1.0.0/ && $(COPY_FILE) --parents main.cpp Debug/first3_qt1.0.0/ && (cd `dirname Debug/first3_qt1.0.0` && $(TAR) first3_qt1.0.0.tar first3_qt1.0.0 && $(COMPRESS) first3_qt1.0.0.tar) && $(MOVE) `dirname Debug/first3_qt1.0.0`/first3_qt1.0.0.tar.gz . && $(DEL_FILE) -r Debug/first3_qt1.0.0

clean:compiler_clean
-$(DEL_FILE) $(OBJECTS)
-$(DEL_FILE) *~ core *.core

####### Sub-libraries

distclean: clean
-$(DEL_FILE) $(TARGET)
-$(DEL_FILE) first3_qt.mk

check: first

/opt/qtsdk-2010.05/qt/bin/moc:
(cd $(QTDIR)/src/tools/moc && $(MAKE))

mocclean: compiler_moc_header_clean compiler_moc_source_clean

mocables: compiler_moc_header_make_all compiler_moc_source_make_all

compiler_rcc_make_all:
compiler_rcc_clean:
compiler_uic_make_all:
compiler_uic_clean:
compiler_image_collection_make_all: qmake_image_collection.cpp
compiler_image_collection_clean:
-$(DEL_FILE) qmake_image_collection.cpp
compiler_yacc_decl_make_all:
compiler_yacc_decl_clean:
compiler_yacc_impl_make_all:
compiler_yacc_impl_clean:
compiler_lex_make_all:
compiler_lex_clean:
compiler_moc_header_make_all:
compiler_moc_header_clean:
compiler_moc_source_make_all: main.moc
compiler_moc_source_clean:
-$(DEL_FILE) main.moc
main.moc: main.cpp \
/opt/qtsdk-2010.05/qt/bin/moc
/opt/qtsdk-2010.05/qt/bin/moc $(DEFINES) $(INCPATH) main.cpp -o main.moc

compiler_clean: compiler_moc_source_clean

####### Compile

Debug/main.o: main.cpp
$(CXX) -c $(CXXFLAGS) $(INCPATH) -o Debug/main.o main.cpp

####### Install

install: FORCE

uninstall: FORCE

FORCE:

Pro file:

##########################################
# codelite's qmake configuration: MyQMake
# codelite's qmake exec line :
##########################################
DESTDIR = /home/pawels/dev/test_qt/first3_qt/
TEMPLATE = app
CONFIG = release qt lex yacc uic resources warn_on precompile_header
MAKEFILE = /home/pawels/dev/test_qt/first3_qt/first3_qt.mk
OBJECTS_DIR = ./Debug
TARGET = ./Debug/first3_qt
INCLUDEPATH = .
QMAKE_CFLAGS_RELEASE = -g
QMAKE_CXXFLAGS_RELEASE = -g
DEFINES =
QMAKE_LFLAGS_RELEASE =
LIBS =
LIBS +=
LIBS +=
SOURCES = \
/home/pawels/dev/test_qt/first3_qt/main.cpp\

HEADERS = \

FORMS = \

YACCSOURCES = \

LEXSOURCES = \

RESOURCES = \

##########################################
# User section
##########################################

CONFIG += debug

Is if possible that qmake is not called at all?

I am on 32 bit machine running fedora 13.

Post by **eranif** » Fri Oct 15, 2010 10:32 am

Hi,

This is not really a codelite issue, but a QT issue:

When u run 'qmake' (codelite does that for you), qmake searches for Q_OBJECTS and other macros of QT in the sources. When it does find one, it generates a .moc file (which contains the missing functions that your linker complains about).
In your case, qmake does not generate the .moc file, since (it seems) that it will only generate a .moc file if you will attempt to include one.

Change your code to be (note that I added #include <main.moc> after the class declaration):

Code: Select all

#include <QtGui>
#include <QWidget>

class QLabel;
class QLineEdit;
class QTextEdit;

class AddressBook;
class AddressBook : public QWidget
{
	Q_OBJECT
public:
	AddressBook(QWidget *parent = 0);
private:
	QLineEdit *nameLine;
	QTextEdit *addressText;
};


AddressBook::AddressBook(QWidget *parent)
	: QWidget(parent)
{
}

#include <main.moc>

int main(int argc, char *argv[])
{
	QApplication app(argc, argv);
	AddressBook addressBook;
	addressBook.show();
	return app.exec();
}

And then right click on the project and rebuild it (it worked for. i.e. with your code I got the linking errors, after adding the #include <main.moc> I got the file main.moc to be generated)
Eran

Post by **ogee77** » Fri Oct 15, 2010 3:31 pm

Thanks Eran, this solved the problem!

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QMake issue - vtable

QMake issue - vtable

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