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Using google protobuf with Qt Creator

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  • jsulmJ jsulm

    @VimHar On windows you need libprotobuf.lib to link at build time - do you have it?

    V Offline
    V Offline
    VimHar
    wrote on last edited by VimHar
    #11

    @jsulm Yes as stated I have these files in lib folder of the path specified,
    libprotobuf.lib , libprotobuf-lite.lib , libprotoc.lib

    My .pro file

    QT += core gui

    greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

    CONFIG += c++17

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

    LIBS += -LC:/vcpkg/installed/x64-windows/lib/ -lprotobuf

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

    HEADERS +=
    mainwindow.h
    m.pb.h

    FORMS +=
    mainwindow.ui

    jsulmJ 1 Reply Last reply
    0
    • V VimHar

      @jsulm Yes as stated I have these files in lib folder of the path specified,
      libprotobuf.lib , libprotobuf-lite.lib , libprotoc.lib

      My .pro file

      QT += core gui

      greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

      CONFIG += c++17

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

      LIBS += -LC:/vcpkg/installed/x64-windows/lib/ -lprotobuf

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

      HEADERS +=
      mainwindow.h
      m.pb.h

      FORMS +=
      mainwindow.ui

      jsulmJ Offline
      jsulmJ Offline
      jsulm
      Lifetime Qt Champion
      wrote on last edited by
      #12

      @VimHar said in Using google protobuf with Qt Creator:

      -lprotobuf

      Try

      -llibprotobuf.lib
      

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

      V 1 Reply Last reply
      0
      • jsulmJ jsulm

        @VimHar said in Using google protobuf with Qt Creator:

        -lprotobuf

        Try

        -llibprotobuf.lib
        
        V Offline
        V Offline
        VimHar
        wrote on last edited by
        #13

        @jsulm No same error. Cannot find llibprotouf.lib

        JonBJ 1 Reply Last reply
        0
        • V VimHar

          @jsulm No same error. Cannot find llibprotouf.lib

          JonBJ Offline
          JonBJ Offline
          JonB
          wrote on last edited by
          #14

          @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 1 Reply Last reply
          0
          • 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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