Undefined reference to extern variables

Asked Jan 07 '14 at 08:02

Active Jan 07 '14 at 08:02

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I'm using qxmpp library while extending it. I've faced problem when I using extern char* variable from that library. There is a QXmppConstants.h that contains namespaces. I've included qxmpp library it works fine. But when I compiled my project in windows it prompts the following error:

error: undefined reference to ns_bytestreams'

error: undefined reference to ns_disco_info'

error: undefined reference to ns_disco_items'

How to fix that?

asked Jan 07 '14 at 08:02

elgolondrino

A library is not only the header files, it's also the actual *library* that you need to *link* with. – Some programmer dude Jan 07 '14 at 08:04
I've linked it in my *.pro file. – elgolondrino Jan 07 '14 at 08:05
Are you statically linking against qxmpp.lib? Or are you using qxmpp.dll? Then you need to export your new symbols from that DLL. – Werner Henze Jan 07 '14 at 09:49
I linked the following: include(W:/qxmpp-0.7.6/qxmpp.pri) // source INCLUDEPATH += $$QXMPP_INCLUDEPATH LIBS += -LW:/qxmpp/src $$QXMPP_LIBS // compiled one – elgolondrino Jan 07 '14 at 11:01

Undefined reference to extern variables

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