Problem Compiling Widget application, Linux

maxwell31

Hi,

I have problems linking a widgets application. The error I get looks like this:

CMakeFiles/test/src/moc_TestClass.cpp.o:(.data.rel.ro._ZTV28TestClass[_ZTV28TestClass]+0x218): undefined reference to `non-virtual thunk to QWidget::redirected(QPoint*) const'
CMakeFiles/test/src/moc_TestClass.cpp.o:(.data.rel.ro._ZTV28TestClass[_ZTV28TestClass]+0x220): undefined reference to `non-virtual thunk to QWidget::sharedPainter() const'
CMakeFiles/test/src/moc_TestClass.cpp.o:(.data.rel.ro._ZTI28TestClass[_ZTI28TestClass]+0x10): undefined reference to `typeinfo for QDialog'
libs/libmylib.a(mylib.cpp.o): In function `mylib_init':
mylib.cpp:(.text+0x4b): undefined reference to `QApplication::QApplication(int&, char**, int)'
collect2: error: ld returned 1 exit status

I have no idea what is going on. In target_link_libraries I have the packages:

target_link_libraries(  ${PROJECT_NAME}
  ${ADDITIONAL_LIBRARIES}
  ${QWT_LIBRARY}
  Qt5::Core
  Qt5::Widgets
  Qt5::Svg

what is going wrong?

Christian Ehrlicher

@maxwell31 said in Problem Compiling Widget application, Linux:

QApplication::QApplication(int&, char**, int)

This is a Qt4 ctor: https://doc.qt.io/archives/qt-4.8/qapplication.html#QApplication-3

Looks like you're picking up the Qt4 include files.