I found a problem in building project with QtNetwork
May be must be inserted in bug list, KDE or cmake ?,

starting from a KDE Graphical template i build this project

Code: Select all

kgraphicaltest.h

#include "ui_prefs_base.h"
#include <QtNetwork>


class KGraphicalTestView;
class KToggleAction;
class KUrl;

class KGraphicalTest : public KXmlGuiWindow
{
    Q_OBJECT
public:
    /**
     * Default Constructor
     */
    KGraphicalTest();

    /**
     * Default Destructor
     */
    virtual ~KGraphicalTest();

private slots:
    void fileNew();
    void optionsPreferences();

private:
    void setupActions();


    QUdpSocket *udpSocket;



private:
    Ui::prefs_base ui_prefs_base ;
    KGraphicalTestView *m_view;

    KToggleAction *m_toolbarAction;
    KToggleAction *m_statusbarAction;
};

#endif // _KGraphicalTest_H_

--------------------------------------------------------
kgraphicaltest.cpp

#include "kgraphicaltest.h"
#include "kgraphicaltestview.h"
#include "settings.h"
#include "ui_prefs_base.h"

#include <QtGui/QDropEvent>

#include <KConfigDialog>
#include <KStatusBar>

#include <KAction>
#include <KActionCollection>
#include <KStandardAction>

#include <KLocale>

KGraphicalTest::KGraphicalTest()
    : KXmlGuiWindow(),
      m_view(new KGraphicalTestView(this))
{
     ................

   
    udpSocket = new QUdpSocket(this);

}

-------------------------------------

cmakelists.txt

set(kgraphicaltest_SRCS
   kgraphicaltest.cpp
   main.cpp
   kgraphicaltestview.cpp
 )

kde4_add_ui_files(kgraphicaltest_SRCS kgraphicaltestview_base.ui prefs_base.ui)

kde4_add_kcfg_files(kgraphicaltest_SRCS settings.kcfgc )

kde4_add_executable(kgraphicaltest ${kgraphicaltest_SRCS})

target_link_libraries(kgraphicaltest ${KDE4_KDEUI_LIBS} ${QT_QTDECLARATIVE_LIBRARY} )

install(TARGETS kgraphicaltest ${INSTALL_TARGETS_DEFAULT_ARGS} )


########### install files ###############

install( PROGRAMS kgraphicaltest.desktop  DESTINATION ${XDG_APPS_INSTALL_DIR} )
install( FILES kgraphicaltest.kcfg  DESTINATION  ${KCFG_INSTALL_DIR} )
install( FILES kgraphicaltestui.rc  DESTINATION  ${DATA_INSTALL_DIR}/kgraphicaltest )

add_subdirectory(qml)
-------------------------------------------

from build.make
...............
# External object files for target kgraphicaltest
kgraphicaltest_EXTERNAL_OBJECTS =

src/kgraphicaltest: src/CMakeFiles/kgraphicaltest.dir/kgraphicaltest_automoc.o
src/kgraphicaltest: src/CMakeFiles/kgraphicaltest.dir/kgraphicaltest.o
src/kgraphicaltest: src/CMakeFiles/kgraphicaltest.dir/main.o
src/kgraphicaltest: src/CMakeFiles/kgraphicaltest.dir/kgraphicaltestview.o
src/kgraphicaltest: src/CMakeFiles/kgraphicaltest.dir/settings.o
src/kgraphicaltest: src/CMakeFiles/kgraphicaltest.dir/build.make
src/kgraphicaltest: /usr/lib/libkdeui.so.5.10.3
src/kgraphicaltest: /usr/lib/libQtDeclarative.so
src/kgraphicaltest: /usr/lib/libkdecore.so.5.10.3
src/kgraphicaltest: /usr/lib/libQtDBus.so
src/kgraphicaltest: /usr/lib/libQtCore.so
src/kgraphicaltest: /usr/lib/libQtGui.so
src/kgraphicaltest: /usr/lib/libQtSvg.so
src/kgraphicaltest: src/CMakeFiles/kgraphicaltest.dir/link.txt
   @$(CMAKE_COMMAND) -E cmake_echo_color --switch=$(COLOR) --red --bold "Linking CXX executable kgraphicaltest"
   cd /workarea/projects/KGraphicalTest/build/src && $(CMAKE_COMMAND) -E cmake_link_script CMakeFiles/kgraphicaltest.dir/link.txt --verbose=$(VERBOSE)
   cd /workarea/projects/KGraphicalTest/build/src && /usr/bin/cmake -D_filename=/workarea/projects/KGraphicalTest/build/src/kgraphicaltest.shell -D_library_path_variable=LD_LIBRARY_PATH -D_ld_library_path="/workarea/projects/KGraphicalTest/build/lib/./:/usr/local/lib:/usr/lib:/usr/lib" -D_executable=/workarea/projects/KGraphicalTest/build/src/kgraphicaltest -P /usr/share/apps/cmake/modules/kde4_exec_via_sh.cmake


When project is built I get error message

undefined reference to symbol '_ZN10QUdpSocketC1EP7QObject'
note: '_ZN10QUdpSocketC1EP7QObject' is defined in DSO /usr/lib/libQtNetwork.so.4 so try adding it to the linker command line

so I insert in the cmakelists.txt

${QT_QTNETWORK_LIBRARY}

Code: Select all

cmakelists.txt modifified

set(kgraphicaltest_SRCS
   kgraphicaltest.cpp
   main.cpp
   kgraphicaltestview.cpp
 )

kde4_add_ui_files(kgraphicaltest_SRCS kgraphicaltestview_base.ui prefs_base.ui)

kde4_add_kcfg_files(kgraphicaltest_SRCS settings.kcfgc )

kde4_add_executable(kgraphicaltest ${kgraphicaltest_SRCS})

target_link_libraries(kgraphicaltest ${KDE4_KDEUI_LIBS} ${QT_QTDECLARATIVE_LIBRARY} ${QT_QTNETWORK_LIBRARY} )

install(TARGETS kgraphicaltest ${INSTALL_TARGETS_DEFAULT_ARGS} )


########### install files ###############

install( PROGRAMS kgraphicaltest.desktop  DESTINATION ${XDG_APPS_INSTALL_DIR} )
install( FILES kgraphicaltest.kcfg  DESTINATION  ${KCFG_INSTALL_DIR} )
install( FILES kgraphicaltestui.rc  DESTINATION  ${DATA_INSTALL_DIR}/kgraphicaltest )

------------------------------------------

the build.make became
.....................................
# External object files for target kgraphicaltest
kgraphicaltest_EXTERNAL_OBJECTS =

src/kgraphicaltest: src/CMakeFiles/kgraphicaltest.dir/kgraphicaltest_automoc.o
src/kgraphicaltest: src/CMakeFiles/kgraphicaltest.dir/kgraphicaltest.o
src/kgraphicaltest: src/CMakeFiles/kgraphicaltest.dir/main.o
src/kgraphicaltest: src/CMakeFiles/kgraphicaltest.dir/kgraphicaltestview.o
src/kgraphicaltest: src/CMakeFiles/kgraphicaltest.dir/settings.o
src/kgraphicaltest: src/CMakeFiles/kgraphicaltest.dir/build.make
src/kgraphicaltest: /usr/lib/libkdeui.so.5.10.3
src/kgraphicaltest: /usr/lib/libQtDeclarative.so
src/kgraphicaltest: /usr/lib/libQtNetwork.so
src/kgraphicaltest: /usr/lib/libkdecore.so.5.10.3
src/kgraphicaltest: /usr/lib/libQtDBus.so
src/kgraphicaltest: /usr/lib/libQtCore.so
src/kgraphicaltest: /usr/lib/libQtGui.so
src/kgraphicaltest: /usr/lib/libQtSvg.so
src/kgraphicaltest: src/CMakeFiles/kgraphicaltest.dir/link.txt
   @$(CMAKE_COMMAND) -E cmake_echo_color --switch=$(COLOR) --red --bold "Linking CXX executable kgraphicaltest"
   cd /workarea/projects/KGraphicalTest/build/src && $(CMAKE_COMMAND) -E cmake_link_script CMakeFiles/kgraphicaltest.dir/link.txt --verbose=$(VERBOSE)
   cd /workarea/projects/KGraphicalTest/build/src && /usr/bin/cmake -D_filename=/workarea/projects/KGraphicalTest/build/src/kgraphicaltest.shell -D_library_path_variable=LD_LIBRARY_PATH -D_ld_library_path="/workarea/projects/KGraphicalTest/build/lib/./:/usr/local/lib:/usr/lib:/usr/lib" -D_executable=/workarea/projects/KGraphicalTest/build/src/kgraphicaltest -P /usr/share/apps/cmake/modules/kde4_exec_via_sh.cmake


the missing library is inserted

src/kgraphicaltest: /usr/lib/libQtNetwork.so

the project is built.

Who is making mistake because with other objects ( widget or .. ) the corrisponding librarries are correctly inserted.

It is probably an omission, as it would have initially worked until CMake / KDE binary building policies were tightened. This change meant that libraries now had to be explicitly linked, and not implicitly linked.

The bug in this case is in the template code.