DCOP undefined reference

Zotty · 01-04-2005, 10:52 AM

I'm trying to use the DCOP interface, but there are some undefined references during the linking stage which I haven't been able to fix so far:

The error output

Code:

g++  -I/usr/include/kde -I/usr/share/qt3/include -I/usr/share/qt3/lib -I/usr/X11R6/include -I/usr/X11R6/lib -c queuehandler.cpp -o queuehandler.o
g++ -L/usr/lib -L/usr/share/qt3/lib -L/usr/X11R6/lib -lkdecore -lkdeui -lkio -lqt-mt -lXext -lX11 -o main main.o queuehandler.o
queuehandler.o(.gnu.linkonce.r._ZTV12QueueHandler+0x28): undefined reference to `DCOPIface::process(QCString const&, QMemArray<char> const&, QCString&, QMemArray<char>&)'
queuehandler.o(.gnu.linkonce.r._ZTV12QueueHandler+0x2c): undefined reference to `DCOPIface::functions()'
queuehandler.o(.gnu.linkonce.r._ZTV12QueueHandler+0x30): undefined reference to `DCOPIface::interfaces()'
queuehandler.o(.gnu.linkonce.r._ZTV12QueueHandler+0x64): undefined reference to `virtual thunk [v:0,-16] to DCOPIface::process(QCString const&, QMemArray<char> const&, QCString&, QMemArray<char>&)'
queuehandler.o(.gnu.linkonce.r._ZTV12QueueHandler+0x74): undefined reference to `virtual thunk [v:0,-32] to DCOPIface::interfaces()'
queuehandler.o(.gnu.linkonce.r._ZTV12QueueHandler+0x78): undefined reference to `virtual thunk [v:0,-36] to DCOPIface::functions()'
queuehandler.o(.gnu.linkonce.r._ZTC12QueueHandler0_9DCOPIface+0x18): undefined reference to `typeinfo for DCOPIface'
queuehandler.o(.gnu.linkonce.r._ZTC12QueueHandler0_9DCOPIface+0x24): undefined reference to `DCOPIface::process(QCString const&, QMemArray<char> const&, QCString&, QMemArray<char>&)'
queuehandler.o(.gnu.linkonce.r._ZTC12QueueHandler0_9DCOPIface+0x28): undefined reference to `DCOPIface::functions()'
queuehandler.o(.gnu.linkonce.r._ZTC12QueueHandler0_9DCOPIface+0x2c): undefined reference to `DCOPIface::interfaces()'
queuehandler.o(.gnu.linkonce.r._ZTC12QueueHandler0_9DCOPIface+0x54): undefined reference to `typeinfo for DCOPIface'
queuehandler.o(.gnu.linkonce.r._ZTC12QueueHandler0_9DCOPIface+0x60): undefined reference to `virtual thunk [v:0,-16] to DCOPIface::process(QCString const&, QMemArray<char> const&, QCString&, QMemArray<char>&)'
queuehandler.o(.gnu.linkonce.r._ZTC12QueueHandler0_9DCOPIface+0x70): undefined reference to `virtual thunk [v:0,-32] to DCOPIface::interfaces()'
queuehandler.o(.gnu.linkonce.r._ZTC12QueueHandler0_9DCOPIface+0x74): undefined reference to `virtual thunk [v:0,-36] to DCOPIface::functions()'
queuehandler.o(.gnu.linkonce.t._ZN9DCOPIfaceD0Ev+0xa): In function `DCOPIface::~DCOPIface [in-charge deleting]()':
: undefined reference to `vtable for DCOPIface'
queuehandler.o(.gnu.linkonce.t._ZN9DCOPIfaceD0Ev+0x19): In function `DCOPIface::~DCOPIface [in-charge deleting]()':
: undefined reference to `vtable for DCOPIface'
queuehandler.o(.gnu.linkonce.t._ZN9DCOPIfaceD1Ev+0xa): In function `DCOPIface::~DCOPIface [in-charge]()':
: undefined reference to `vtable for DCOPIface'
queuehandler.o(.gnu.linkonce.t._ZN9DCOPIfaceD1Ev+0x19): In function `DCOPIface::~DCOPIface [in-charge]()':
: undefined reference to `vtable for DCOPIface'
queuehandler.o(.gnu.linkonce.r._ZTI12QueueHandler+0x10): undefined reference to `typeinfo for DCOPIface'
collect2: ld returned 1 exit status
make: *** [main] Error 1

My basic DCOPIface class (only used to send)

Code:

#ifndef DCOPIFACE_H
#define DCOPIFACE_H

#include <dcopobject.h>

class DCOPIface : virtual public DCOPObject
{
    K_DCOP
    k_dcop:
};

#endif

And the only dcop code used so far

Code:

QueueHandler :: QueueHandler()
	: DCOPObject( "DCOPTest" )
{
	// Register with DCOP
	if ( !kapp->dcopClient()->isRegistered() ) {
		kapp->dcopClient()->registerAs( "DCOP Testing" );
		kapp->dcopClient()->setDefaultObject( objId() );
	}
}

Any idea's?

leonscape · 01-04-2005, 07:40 PM

This looks like a missing lib, what libs have you set to compile against?

Also have you added in the .skel file to your Makefile.am?

Checkout tutorial

Zotty · 01-06-2005, 09:30 AM

The missing lib what I thought aswell, but which one? I've tried a bunch of libkde*** libraries, but no luck.

There's my makefile

Code:

CC			= g++

DCOPIDL		= /usr/bin/dcopidl
DCOPIDL2CPP	= /usr/bin/dcopidl2cpp
DCOPIDLNG	= /usr/bin/dcopidlng
KDE_INCLUDES = -I/usr/include/kde
KDE_LDFLAGS = -L/usr/lib
QT_INCLUDES	= -I/usr/share/qt3/include
QT_LDFLAGS	= -I/usr/share/qt3/lib
X_INCLUDES	= -I/usr/X11R6/include
X_LDFLAGS	= -I/usr/X11R6/lib

INCLUDES = -I/usr/include/kde -I/usr/share/qt3/include -I/usr/share/qt3/lib -I/usr/X11R6/include -I/usr/X11R6/lib
LIBS =  -L/usr/lib -L/usr/share/qt3/lib -L/usr/X11R6/lib -lkdecore -lkdeui -lkio -lqt-mt -lXext -lX11

CFLAGS		=
PREFIX		= /usr
OBJECTS 	= main.o queuehandler.o

all: main

main: $(OBJECTS)
	$(CC) $(LIBS) -o $@ $(OBJECTS)

.cpp.o:
	$(CC) $(CFLAGS) $(INCLUDES) -c $< -o $@

clean:
	rm -f *.o

I've also read several tutorials, but no answer there... May be a silly question, but what's a .skel file for? Never heard of those before (I'm a starting Linux developer

), although I've seen the term pop up (also in the tutorial you linked to).

leonscape · 01-06-2005, 01:38 PM

The skel file is created automatically by dcopidl when it processes the DCOP interface definition.

The best way to create KDE apps is to use the Automake setup provided for KDE, either in the kdesdk module, or through KDevelop.
This will setup the moc, and most of the libs for you. It means your only having to work on a Makefile.am rather than writing your own
makefiles, and configuration. Plus stuff like processing dcopidl will work rather easily. A couple of links for you:

KDE Developers Corner
KDE Libs API
Qt Libs API

Zotty · 01-06-2005, 04:40 PM

Well, I guess I'll have to do some more reading and experimenting then

On the other hand, there's a simple reason why I've made my own makefile; I don't like working with KDevelop. Hence I'd still like to find out how to get this to work (by hand).

In any case, thanks for the links. I'll check them out asap and stuff the info in some braincells!.

leonscape · 01-06-2005, 04:47 PM

I'd still recommend getting the kdesdk, with the Makefile and configuration scripts ( and basic templates for KDE porgrams ), it will make your life a lot easier.

Zotty · 01-06-2005, 05:04 PM

I'll promise to check it out. Can't be wrong to broaden one's horizon now and then.