I'm building some plugins for QT Creator, and some are finished, but sometimes I bump in the undefined reference to .. error. I had it when i tried to use something like:

Qt Code: 
  1. CppEditor::Internal::CPPEditorWidget *testccped = qobject_cast<CppEditor::Internal::CPPEditorWidget *>(textEditor->widget());
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error:
Qt Code: 
  1. ./release\extractmethod.o:extractmethod.cpp:(.text+0x3f7): undefined reference to 'CppEditor::Internal::CPPEditorWidget::staticMetaObject'
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So I didn't found the problem back then, but now I have it again. And it would motivate me if I could fix this.
So the case now:

my pro file: (My apologies for the messy pro file, the cleaning part still has to come)
Qt Code: 
  1. TARGET = RefactoringPlugin
  2. CONFIG += release
  3. TEMPLATE = lib
  4.  
  5. DEFINES += REFACTORINGPLUGIN_LIBRARY
  6.  
  7.  
  8. # RefactoringPlugin files
  9.  
  10. SOURCES += refactoringpluginplugin.cpp \
  11.     methoderenamedialog.cpp \
  12.     dialog.cpp \
  13.     extractmethod.cpp \
  14.     debugdialog.cpp \
  15.     extractmethoddialog.cpp \
  16.     gensetget.cpp
  17.  
  18.  
  19. HEADERS += refactoringpluginplugin.h\
  20.         refactoringplugin_global.h\
  21.         refactoringpluginconstants.h \
  22.     methoderenamedialog.h \
  23.     dialog.h \
  24.     extractmethod.h\
  25.     debugdialog.h \
  26.     extractmethoddialog.h \
  27.     gensetget.h
  28.  
  29.  
  30. OTHER_FILES = RefactoringPlugin.pluginspec
  31.  
  32.  
  33. # Qt Creator linking
  34. QTC_SOURCE_DIR = C:/qt-creator-2.4.1-src
  35. IDE_SOURCE_TREE = $$QTC_SOURCE_DIR
  36. QTC_BUILD_DIR = C:/qtcr24
  37.  
  38. include($$QTC_SOURCE_DIR/src/qtcreatorplugin.pri)
  39. include($$QTC_SOURCE_DIR/src/plugins/coreplugin/coreplugin.pri)
  40. include($$QTC_SOURCE_DIR/src/plugins/texteditor/texteditor.pri)
  41. include($$QTC_SOURCE_DIR/src/plugins/coreplugin/coreplugin.pri)
  42. include($$QTC_SOURCE_DIR/src/plugins/vcsbase/vcsbase.pri)
  43. include($$QTC_SOURCE_DIR/src/libs/utils/utils.pri)
  44. include($$QTC_SOURCE_DIR/src/libs/cplusplus/cplusplus.pri)
  45. include($$QTC_SOURCE_DIR/src/plugins/cppeditor/cppeditor_dependencies.pri)
  46. include($$IDE_SOURCE_TREE/src/plugins/coreplugin/coreplugin.pri )
  47. include($$IDE_SOURCE_TREE/src/plugins/texteditor/texteditor.pri )
  48. include($$QTC_SOURCE_DIR/src/plugins/cppeditor/cppeditor.pri)
  49. include($$QTC_SOURCE_DIR/src/plugins/cpptools/cpptools.pri)
  50. include($$QTC_SOURCE_DIR/src/plugins/locator/locator.pri)
  51.  
  52. LIBS += -LC:/qtcr24/bin \
  53.         -LC:/qtcr24/lib/qtcreator/plugins/Nokia/ \
  54.         -LC:/qtcr24/lib/qtcreator/plugins \
  55.         -LC:/qtcr24/src/plugins/cppeditor/release
  56.  
  57.  
  58.  
  59.  
  60. DESTDIR = $$DEST
  61.  
  62. INCLUDEPATH += $$QTC_SOURCE_DIR/src \
  63.     $$QTC_SOURCE_DIR/src/plugins \
  64.     C:/qt-creator-2.4.1-src/src/plugins/cppeditor \
  65.     $$QTC_SOURCE_DIR/src/plugins/cppeditor \
  66.     $$QTC_SOURCE_DIR/src/plugins/coreplugin/ \
  67.     $$QTC_SOURCE_DIR/src/plugins/coreplugin/editormanager \
  68.     $$QTC_SOURCE_DIR/src/plugins/texteditor/codeassist/ \
  69.     $$QTC_SOURCE_DIR/src/libs \
  70.     $$QTC_SOURCE_DIR/src/libs/cplusplus \
  71.     $$QTC_SOURCE_DIR/src/libs/extensionsystem \
  72.     $$QTC_SOURCE_DIR/src/libs/utils \
  73.     $$QTC_SOURCE_DIR/src/libs/3rdparty \
  74.     $$QTC_SOURCE_DIR/src/libs/3rdparty/cplusplus \
  75.     $$QTC_SOURCE_DIR/src/shared \
  76.     $$QTC_SOURCE_DIR/src/shared/cplusplus
  77.  
  78.  
  79. FORMS += \
  80.     dialog.ui \
  81.     debugdialog.ui \
  82.     extractmethoddialog.ui
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the problem in the code: (if I comment this, it builds perfect)
Qt Code: 
  1. void ExtractMethod::dualscr()
  2. {
  3.     Core::Internal::EditorView *w = new Core::Internal::EditorView();
  4.     w->show();
  5. }
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compile error:
Qt Code: 
  1. g++ -Wl,-s -mthreads -shared -Wl,--out-implib,release\libRefactoringPlugin.a -o release\RefactoringPlugin.dll object_script.RefactoringPlugin.Release  -L"c:\QtSDK1.2\Desktop\Qt\4.8.0\mingw\lib" -L/lib/qtcreator -L/lib/qtcreator/plugins/Nokia -lAggregation -lExtensionSystem -lBotan -lUtils -lCore -lFind -lQtConcurrent -lLocator -lTextEditor -lProjectExplorer -lVCSBase -lCPlusPlus -lLanguageUtils -lCppTools -lCppEditor -LC:/qtcr24/bin -LC:/qtcr24/lib/qtcreator/plugins/Nokia/ -LC:/qtcr24/lib/qtcreator/plugins -LC:/qtcr24/src/plugins/cppeditor/release -lQtGui4 -lQtCore4 
  2. Creating library file: release\libRefactoringPlugin.a
  3. mingw32-make.exe[1]: Leaving directory `C:/Users/Bavo/thesis/refactoring/refactoringPlugin'
  4. [COLOR="#FF0000"]./release\extractmethod.o:extractmethod.cpp:(.text+0x21): undefined reference to `Core::Internal::EditorView::EditorView(QWidget*)[/COLOR]'
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I know it's a linker problem but I just can find the problem. Anybody an idea?