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Using google protobuf with Qt Creator

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  • JonBJ JonB

    @VimHar
    There have been inconsistencies in the spellings of what you have typed in your various posts. Why don't you try:

    LIBS += C:\vcpkg\installed\x64-windows\lib\libprotobuf.lib
    

    Please use copy & paste of above line. If you get error please copy & paste exact text back here.

    V Offline
    V Offline
    VimHar
    wrote on last edited by
    #15

    @JonB said in Using google protobuf with Qt Creator:

    LIBS += C:\vcpkg\installed\x64-windows\lib\libprotobuf.lib

    QT += core gui

    greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

    CONFIG += c++17

    INCLUDEPATH += C:\vcpkg\installed\x64-windows\include\

    LIBS += C:\vcpkg\installed\x64-windows\lib\libprotobuf.lib

    SOURCES +=
    main.cpp
    mainwindow.cpp
    m.pb.cc

    HEADERS +=
    mainwindow.h
    m.pb.h

    FORMS +=
    mainwindow.ui

    Sorry for the same. Even then Im getting the same undefined error faced by the actual questioner.
    i.e "undefined reference to `google::protobuf::internal::AssignDescriptors(google::protobuf::internal::DescriptorTable const*, bool)''

    jsulmJ JonBJ 2 Replies Last reply
    0
    • V VimHar

      @JonB said in Using google protobuf with Qt Creator:

      LIBS += C:\vcpkg\installed\x64-windows\lib\libprotobuf.lib

      QT += core gui

      greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

      CONFIG += c++17

      INCLUDEPATH += C:\vcpkg\installed\x64-windows\include\

      LIBS += C:\vcpkg\installed\x64-windows\lib\libprotobuf.lib

      SOURCES +=
      main.cpp
      mainwindow.cpp
      m.pb.cc

      HEADERS +=
      mainwindow.h
      m.pb.h

      FORMS +=
      mainwindow.ui

      Sorry for the same. Even then Im getting the same undefined error faced by the actual questioner.
      i.e "undefined reference to `google::protobuf::internal::AssignDescriptors(google::protobuf::internal::DescriptorTable const*, bool)''

      jsulmJ Offline
      jsulmJ Offline
      jsulm
      Lifetime Qt Champion
      wrote on last edited by
      #16

      @VimHar Was the Protobuf lib built using same compiler? What compiler do you use to build your app?

      https://forum.qt.io/topic/113070/qt-code-of-conduct

      1 Reply Last reply
      0
      • V VimHar

        @JonB said in Using google protobuf with Qt Creator:

        LIBS += C:\vcpkg\installed\x64-windows\lib\libprotobuf.lib

        QT += core gui

        greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

        CONFIG += c++17

        INCLUDEPATH += C:\vcpkg\installed\x64-windows\include\

        LIBS += C:\vcpkg\installed\x64-windows\lib\libprotobuf.lib

        SOURCES +=
        main.cpp
        mainwindow.cpp
        m.pb.cc

        HEADERS +=
        mainwindow.h
        m.pb.h

        FORMS +=
        mainwindow.ui

        Sorry for the same. Even then Im getting the same undefined error faced by the actual questioner.
        i.e "undefined reference to `google::protobuf::internal::AssignDescriptors(google::protobuf::internal::DescriptorTable const*, bool)''

        JonBJ Offline
        JonBJ Offline
        JonB
        wrote on last edited by JonB
        #17

        @VimHar said in Using google protobuf with Qt Creator:

        Even then Im getting the same undefined error faced by the actual questioner.
        i.e "undefined reference to `google::protobuf::internal::AssignDescriptors(google::protobuf::internal::DescriptorTable const*, bool)''

        Now I do not understand, because this is not the same error at all as you said you were having. You said you got one of:

        . :-1: error: cannot find -lprotobuf
        Cannot find llibprotouf.lib

        These errors mean it could not find the library file to link with --- which is why I wanted to get you to type in the full path --- where the error now is that the library file is found, but you have an unresolved reference. Quite different kinds of error.

        I think/suspect the lib file is being found but is the wrong version or built with the wrong compiler or something like that.... Please start by answering @jsulm's question with your best information.

        V 1 Reply Last reply
        1
        • JonBJ JonB

          @VimHar said in Using google protobuf with Qt Creator:

          Even then Im getting the same undefined error faced by the actual questioner.
          i.e "undefined reference to `google::protobuf::internal::AssignDescriptors(google::protobuf::internal::DescriptorTable const*, bool)''

          Now I do not understand, because this is not the same error at all as you said you were having. You said you got one of:

          . :-1: error: cannot find -lprotobuf
          Cannot find llibprotouf.lib

          These errors mean it could not find the library file to link with --- which is why I wanted to get you to type in the full path --- where the error now is that the library file is found, but you have an unresolved reference. Quite different kinds of error.

          I think/suspect the lib file is being found but is the wrong version or built with the wrong compiler or something like that.... Please start by answering @jsulm's question with your best information.

          V Offline
          V Offline
          VimHar
          wrote on last edited by VimHar
          #18

          hey Thanks..JonB.. The actual intention of mine is the "undefined error" only.
          Regarding compilers, I used vcpkg for installing protobuf and Qt uses MinGw64.

          Is this the problem??

          jsulmJ JonBJ 2 Replies Last reply
          0
          • V VimHar

            hey Thanks..JonB.. The actual intention of mine is the "undefined error" only.
            Regarding compilers, I used vcpkg for installing protobuf and Qt uses MinGw64.

            Is this the problem??

            jsulmJ Offline
            jsulmJ Offline
            jsulm
            Lifetime Qt Champion
            wrote on last edited by
            #19

            @VimHar said in Using google protobuf with Qt Creator:

            Is this the problem??

            Probably.
            There should be a linker warning in the build log.

            https://forum.qt.io/topic/113070/qt-code-of-conduct

            1 Reply Last reply
            1
            • V VimHar

              hey Thanks..JonB.. The actual intention of mine is the "undefined error" only.
              Regarding compilers, I used vcpkg for installing protobuf and Qt uses MinGw64.

              Is this the problem??

              JonBJ Offline
              JonBJ Offline
              JonB
              wrote on last edited by
              #20

              @VimHar said in Using google protobuf with Qt Creator:

              I used vcpkg for installing protobuf and Qt uses MinGw64.

              I don't know what "vcpkg" is (MSVC??) but it sounds like a different compiler/linker. MinGW library files end in .a not .lib, maybe that is the cause of the "cannot find library" messages? In any case you need to use the smae compiler/linker for everything.

              1 Reply Last reply
              1
              • V Offline
                V Offline
                VimHar
                wrote on last edited by VimHar
                #21

                Hey,.. Great. I have done re-installing protobuf using Msys following the steps below
                https://stackoverflow.com/a/73287395/10432503

                Now I can able to run using plain g++ command in the terminal.

                But when I do the same in QT , the following error occurs
                :-1: error: Dwarf Error: Can't find .debug_ranges section.

                My .pro file
                QT += core gui

                greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

                CONFIG += c++17

                INCLUDEPATH += C:/protobuf-3.21.11/src

                LIBS += -LC:/protobuf-3.21.11/src/.libs -lprotobuf

                SOURCES +=
                main.cpp
                mainwindow.cpp
                m.pb.cc

                HEADERS +=
                mainwindow.h
                m.pb.h

                FORMS +=
                mainwindow.ui

                Should I add anything more.?

                1 Reply Last reply
                0
                • V Offline
                  V Offline
                  VimHar
                  wrote on last edited by
                  #22

                  Hey Jon,

                  Im also sharing you the compiler definitions.
                  7f048c43-9351-45d8-a16a-739fafa8d8da-image.png

                  Im using
                  e42d5a06-f656-4a9e-b4ed-a0159e1c52ff-image.png

                  The g++ command works smoothly. But I'm getting this new error when I compile using QT.
                  FYI, I have two MinGWs one inside QT folder and one inside Msys folder.

                  Am I missing any? :(

                  JonBJ 1 Reply Last reply
                  0
                  • V VimHar

                    Hey Jon,

                    Im also sharing you the compiler definitions.
                    7f048c43-9351-45d8-a16a-739fafa8d8da-image.png

                    Im using
                    e42d5a06-f656-4a9e-b4ed-a0159e1c52ff-image.png

                    The g++ command works smoothly. But I'm getting this new error when I compile using QT.
                    FYI, I have two MinGWs one inside QT folder and one inside Msys folder.

                    Am I missing any? :(

                    JonBJ Offline
                    JonBJ Offline
                    JonB
                    wrote on last edited by
                    #23

                    @VimHar
                    I know nothing about this area. ":-1: error: Dwarf Error: Can't find .debug_ranges section." implies to me you have incompatible compilers or incompatible options or something.

                    1 Reply Last reply
                    1
                    • V Offline
                      V Offline
                      VimHar
                      wrote on last edited by VimHar
                      #24

                      What you said is right. Thanks Jon. Reach out incase you got any. I will try.

                      1 Reply Last reply
                      0
                      • V Offline
                        V Offline
                        VimHar
                        wrote on last edited by
                        #25

                        d60e951b-d2ad-4c5c-90bb-acd5587fc90e-image.png

                        Hey Can you help me how to enable the MSVC compiler , I couldnt choose it.

                        1 Reply Last reply
                        0

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