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error LNK2001: unresolved external symbol "public: static struct QMetaObject .. from lib template

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  • H hskoglund
    9 Jan 2019, 12:46

    Hi, do you have a moc_VideoPreviewWidget.cpp that's compiled using Qt 5.12? (The one in the link is built with Qt 5.9.1)

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    OPit
    wrote on 9 Jan 2019, 16:49 last edited by
    #21

    @hskoglund yes of course : https://we.tl/t-Uhhsre7Vzm

    the problem is the same with version 5.9.1 or 5.12 (and also VS2017 or VS2015)

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      hskoglund
      wrote on 9 Jan 2019, 22:15 last edited by
      #22

      Hi, if you look in the .pro files above for your application and myStream.lib, both .pro files have a inputstreampreview.cpp and a inputstreampreview.h included. They are not located in the same directory (one pair is in ../../src/ and the other pair is in ../../src/view/) but if they have the same contents then maybe the linker gets confused when you build your app (together with your myStream.lib).

      If they do not have the same contents (i.e. just a stroke of bad luck with the naming of your files) then rename one of the pairs. Otherwise, you could try building your app again but with only of the pairs, for example commenting out ../../src/view/inputstreampreview.cpp from the SOURCES section in your Application.pro file.

      O 1 Reply Last reply 11 Jan 2019, 10:33
      3
      • H hskoglund
        9 Jan 2019, 22:15

        Hi, if you look in the .pro files above for your application and myStream.lib, both .pro files have a inputstreampreview.cpp and a inputstreampreview.h included. They are not located in the same directory (one pair is in ../../src/ and the other pair is in ../../src/view/) but if they have the same contents then maybe the linker gets confused when you build your app (together with your myStream.lib).

        If they do not have the same contents (i.e. just a stroke of bad luck with the naming of your files) then rename one of the pairs. Otherwise, you could try building your app again but with only of the pairs, for example commenting out ../../src/view/inputstreampreview.cpp from the SOURCES section in your Application.pro file.

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        OPit
        wrote on 11 Jan 2019, 10:33 last edited by
        #23

        @hskoglund said in error LNK2001: unresolved external symbol "public: static struct QMetaObject .. from lib template:

        inputstreampreview.cpp

        thanks for your answer, but I don't understand well what you want to say.
        inputstreampreview.cpp/.h are only included in myStream.lib (in src folder).
        For my main app, I just include the .h with INCLUDEPATH keyword and link myStream lib with LIBS+= -lmyStream
        I don't know why and where you can see ../../src/view/ path ??

        K 1 Reply Last reply 12 Jan 2019, 03:33
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        • H Offline
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          hskoglund
          wrote on 11 Jan 2019, 13:59 last edited by
          #24

          0_1547215144787_Screenshot from 2019-01-11 14-53-12.png

          O 1 Reply Last reply 11 Jan 2019, 17:41
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          • H hskoglund
            11 Jan 2019, 13:59

            0_1547215144787_Screenshot from 2019-01-11 14-53-12.png

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            OPit
            wrote on 11 Jan 2019, 17:41 last edited by
            #25

            @hskoglund oups it's a mistake, a drag and drop in my exemple app.pro. But even if I remove this entry, I have the same problem.

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            • H Offline
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              hskoglund
              wrote on 12 Jan 2019, 03:31 last edited by hskoglund 1 Dec 2019, 03:33
              #26

              Even if you run qmake and rebuild AppTest.exe i.e. Application.pro?

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              • O OPit
                11 Jan 2019, 10:33

                @hskoglund said in error LNK2001: unresolved external symbol "public: static struct QMetaObject .. from lib template:

                inputstreampreview.cpp

                thanks for your answer, but I don't understand well what you want to say.
                inputstreampreview.cpp/.h are only included in myStream.lib (in src folder).
                For my main app, I just include the .h with INCLUDEPATH keyword and link myStream lib with LIBS+= -lmyStream
                I don't know why and where you can see ../../src/view/ path ??

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                kshegunov
                Moderators
                wrote on 12 Jan 2019, 03:33 last edited by kshegunov 1 Dec 2019, 03:36
                #27

                I'm pretty sure at this point that for whatever reason your static library didn't include the symbol in question. One way or another you need to find why that happened. It may be a bug with the library, or some misconfiguration.

                Read and abide by the Qt Code of Conduct

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                  OPit
                  wrote on 16 Jan 2019, 09:34 last edited by
                  #28

                  Well, I rebuilt QtAV with a new installation of Qt, and it works ....
                  So, even if I didn't understand the mistake, thanks a lot for your help !

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