Re: /usr/lib/gcc/x86_64-redhat-linux/7/../../../../lib64/libQxtWidgets-qt5.so: undefined reference to `vtable for QxtApplication'

[Michael Cullen]

At a guess, and not having looked at the code or logs, I would say it’s
either a virtual destructor defined in a header file (that can cause
problems with the vtable not being generated by any compilation unit)
or it has been built with -fvisibility=hidden and the class is not
marked with visibility(“default”) and so members are not exported from
the library
Michael


On Tue, 28 Nov 2017, at 10:35 PM, Michael Cullen wrote:
>  At a guess, and not having looked at the code or logs, I would say
>  it’s either a virtual destructor defined in a header file (that can
>  cause problems with the vtable not being generated by any compilation
>  unit) or it has been built with -fvisibility=hidden and the class is
>  not marked with visibility(“default”) and so members are not exported
>  from the library> 
>  Michael
>  
>  
>  On Tue, 28 Nov 2017, at 09:17 PM, Martin Gansser wrote:
>  > Maybe someone can tell me which forum I can contact to fix this
>  > error?> > _______________________________________________
>  > devel mailing list -- devel(a)lists.fedoraproject.org
>  > To unsubscribe send an email to devel-leave(a)lists.fedoraproject.org>

/usr/lib/gcc/x86_64-redhat-linux/7/../../../../lib64/libQxtWidgets-qt5.so: undefined reference to `vtable for QxtApplication'

[Martin Gansser]

In the directory src/widgets there is a file widgets.pri (which is included by
widgets.pro)
At line 124 it checks for pre Qt5 and then adds qxtapplication.h to the headers list.
Hence for Qt5 it is not pre-processed by moc.

I have moved line 125: HEADERS += qxtapplication.h to after line 130: } 

--- a/src/widgets/widgets.pri.orig	2017-11-30 08:31:04.069021373 +0100
+++ b/src/widgets/widgets.pri	2017-11-30 08:31:31.692021595 +0100
@@ -122,12 +122,12 @@
     # Native event filter support is implemented in QCoreApplication for Qt5
     # and QxtApplication is not required anymore
 lessThan(QT_MAJOR_VERSION, 5) {
-    HEADERS  += qxtapplication.h
     HEADERS  += qxtapplication_p.h
     unix:!macx:SOURCES += x11/qxtapplication_x11.cpp
     macx:SOURCES += mac/qxtapplication_mac.cpp
     win32:SOURCES += win/qxtapplication_win.cpp
 }
+    HEADERS  += qxtapplication.h
     HEADERS  += qxtglobalshortcut.h
     HEADERS  += qxtglobalshortcut_p.h
     HEADERS  += qxtscreen.h