Yogesh Marwaha wrote:
2008/7/13 Bill Hoffman <[EMAIL PROTECTED]>:
Little t usually means local linkage, so that would be why you can not see
the symbols from an external library. I don't think this is a CMake issue,
but rather a C++ issue of some sort. What does the header file for
GApplication and the .cxx file look like?
There is not much in the GApplicatin header/source.
Here is the header:
#ifndef GAPPLICATION_H
#define GAPPLICATION_H
#include <KApplication>
class GApplication: public KApplication{
Q_OBJECT
public:
GApplication();
~GApplication();
private slots:
void init();
};
#endif
Here is the source:
#include "myapplication.h"
#include "gravity.h"
#include "taglib/fileref.h"
#include "gfiletyperesolver.h"
#include "playlistiohandler.h"
#include "gdevicehandler.h"
#include <KDE/KGlobalAccel>
#include <KDE/KMessage>
#include <KDE/KPassivePopupMessageHandler>
GApplication::GApplication() : KApplication( true ){
setApplicationName("Gravity");
KMessage::setMessageHandler(new KPassivePopupMessageHandler());
KGlobalAccel::self()->setEnabled(true);
TagLib::FileRef::addFileTypeResolver(new GFileTypeResolver);
Gravity::self();
Gravity::self()->systemTrayIcon();
}
GApplication::~GApplication(){
Gravity::self()->deleteSelf();
}
void GApplication::init(){
}
#include "myapplication.moc"
=====================
CMakeFiles/Gravity.dir/main.o: In function `main':
/home/yogesh/gravity/app/main.cpp:10: undefined reference to
`GApplication::GApplication()'
/home/yogesh/gravity/app/main.cpp:12: undefined reference to `Gravity::self()'
/home/yogesh/gravity/app/main.cpp:12: undefined reference to
`Gravity::gUIInterfaceManager() const'
/home/yogesh/gravity/app/main.cpp:13: undefined reference to
`GApplication::~GApplication()'
collect2: ld returned 1 exit status
make[2]: *** [app/Gravity] Error 1
make[1]: *** [app/CMakeFiles/Gravity.dir/all] Error 2
make: *** [all] Error 2
=====================
The above linking error is shown when *app* folder is processed which
has only one main.cpp file: -
#include <KDE/KCmdLineArgs>
#include <KDE/KAboutData>
#include <QString>
#include "gravity.h"
#include "myapplication.h"
int main(int argc, char **argv){
KAboutData aboutData("gravity", "gravity", ki18n("Gravity"),
"0.1", ki18n("Media player"), KAboutData::License_LGPL_V2);
KCmdLineArgs::init(argc, argv, &aboutData);
GApplication app;
app.disableSessionManagement();
Gravity::self()->gUIInterfaceManager();
return app.exec();
}
...thats why there are only four references to complaint about, and
the make quits.
If I change CMakeLists.txt in base folder to process *modules* folder
before *app* then there are hundreds of similar errors shown.
Just to check (not to prove anything) I created another project
(plain/c++) using similar setup which creates a shared library and an
executable which links to that shared library. It got
compiled/linked/installed/executed as expected.
I can supply a copy of complete source code if someone has KDE4
installed (for development) and wants to try it.
OK, so this looks like some sort of moc issue. Are you running moc on
the header? You might want to run nm on all the .o files and find out
where the little "t" stuff is located. Could it be that you have more
than one file called the same thing and the headers are getting included
wrong, or the .moc file is gettting over written?
-Bill
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