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link problems

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  • P Offline
    P Offline
    pdnorman
    wrote on last edited by
    #1

    I retired a little over a year ago and have not used Qt since leaving the work place. I installed QT and mingw 5.3 and tried to compile a simple program. I am pasting the link commands and the first few error messages where the link step failed:

    g++ -Wl,-subsystem,windows -mthreads -o debug\Singles_party.exe debug/begin_party.o debug/party_room.o debug/moc_party_room.o -lmingw32 -LC:\Qt\5.7\mingw53_32\lib C:\Qt\5.7\mingw53_32\lib\libqtmaind.a -LC:\utils\postgresql\pgsql\lib -LC:\utils\my_sql\my_sql\lib -lshell32 C:\Qt\5.7\mingw53_32\lib\libQt5Guid.a C:\Qt\5.7\mingw53_32\lib\libQt5Cored.a
    debug/begin_party.o: In function Z5qMainiPPc': C:\Users\bigdad\Paul\QT\Programs\Singles_party/begin_party.cpp:6: undefined reference to _imp___ZN12QApplicationC1ERiPPci'
    C:\Users\bigdad\Paul\QT\Programs\Singles_party/begin_party.cpp:8: undefined reference to _imp___ZN7QWidget4showEv' C:\Users\bigdad\Paul\QT\Programs\Singles_party/begin_party.cpp:9: undefined reference to _imp___ZN12QApplication4execEv'

    Can someone tell me what I need to do here?

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    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #7

      Hi and welcome to devnet,

      Any chance of missing QT += widgets in your .pro file ?

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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      1
      • mrjjM Offline
        mrjjM Offline
        mrjj
        Lifetime Qt Champion
        wrote on last edited by
        #2

        The mingw you installed.
        Was that from the Qt online installer?

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        1
        • P Offline
          P Offline
          pdnorman
          wrote on last edited by
          #3

          No, from sourceforge

          mrjjM 1 Reply Last reply
          1
          • P pdnorman

            No, from sourceforge

            mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by
            #4

            @pdnorman
            Ok that could be the issue.
            If possible could u remove Qt and install with
            http://download.qt.io/official_releases/qt/5.7/5.7.0/qt-opensource-windows-x86-mingw530-5.7.0.exe
            Its 99% of the time a happy just works out of the box.

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            • P Offline
              P Offline
              pdnorman
              wrote on last edited by
              #5

              same thing happens

              mrjjM 1 Reply Last reply
              0
              • P pdnorman

                same thing happens

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by
                #6

                @pdnorman
                Ok ?!
                Also with a default GUI project via File->New Qt widget application ?

                1 Reply Last reply
                0
                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #7

                  Hi and welcome to devnet,

                  Any chance of missing QT += widgets in your .pro file ?

                  Interested in AI ? www.idiap.ch
                  Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                  1 Reply Last reply
                  1
                  • P Offline
                    P Offline
                    pdnorman
                    wrote on last edited by
                    #8

                    I DID need the QT += widgets in the .pro file. Thanks

                    1 Reply Last reply
                    1

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