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  4. undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceC1Ev in Qt?
Forum Update on Monday, May 27th 2025

undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceC1Ev in Qt?

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  • jsulmJ jsulm

    @Vivek_A Please take a look at the link I gave you and compare with what you did...
    Should be

    LIBS += C:/mongo-cxx-driver/lib/llibbsoncxx.dll
    
    Vivek_AV Offline
    Vivek_AV Offline
    Vivek_A
    wrote on last edited by
    #5

    @jsulm

    LIBS += C:/mongo-cxx-driver/lib/llibbsoncxx.dll
    
    INCLUDEPATH += C:/mongo-cxx-driver/include/mongocxx/v_noabi
    DEPENDPATH += C:/mongo-cxx-driver/include/mongocxx/v_noabi
    
    

    Output:

    g++: error: C:\mongo-cxx-driver\lib\llibbsoncxx.dll: No such file or directory
    Makefile.Release:233: recipe for target 'release\RTLSController.exe' failed
    
    jsulmJ JonBJ 2 Replies Last reply
    0
    • Vivek_AV Vivek_A

      @jsulm

      LIBS += C:/mongo-cxx-driver/lib/llibbsoncxx.dll
      
      INCLUDEPATH += C:/mongo-cxx-driver/include/mongocxx/v_noabi
      DEPENDPATH += C:/mongo-cxx-driver/include/mongocxx/v_noabi
      
      

      Output:

      g++: error: C:\mongo-cxx-driver\lib\llibbsoncxx.dll: No such file or directory
      Makefile.Release:233: recipe for target 'release\RTLSController.exe' failed
      
      jsulmJ Offline
      jsulmJ Offline
      jsulm
      Lifetime Qt Champion
      wrote on last edited by
      #6

      @Vivek_A said in undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceC1Ev in Qt?:

      C:\mongo-cxx-driver\lib\llibbsoncxx.dll

      So, does this file exist? And I mean exact this path.

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

      1 Reply Last reply
      0
      • Vivek_AV Vivek_A

        @jsulm

        LIBS += C:/mongo-cxx-driver/lib/llibbsoncxx.dll
        
        INCLUDEPATH += C:/mongo-cxx-driver/include/mongocxx/v_noabi
        DEPENDPATH += C:/mongo-cxx-driver/include/mongocxx/v_noabi
        
        

        Output:

        g++: error: C:\mongo-cxx-driver\lib\llibbsoncxx.dll: No such file or directory
        Makefile.Release:233: recipe for target 'release\RTLSController.exe' failed
        
        JonBJ Offline
        JonBJ Offline
        JonB
        wrote on last edited by JonB
        #7

        @Vivek_A said in undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceC1Ev in Qt?:

        g++: error: C:\mongo-cxx-driver\lib\llibbsoncxx.dll: No such file or directory

        Originally you had -llibbsoncxx.dll. I am thinking the leading -l was an argument to the linker, followed by the DLL file name? Which would make it LIBS += C:/mongo-cxx-driver/lib/libbsoncxx.dll (only one l)?

        However, this is a separate matter from whether you should be specifying a .dll here, I thought you would need either a .lib (MSVC) or a .a (MinGW)...?

        jsulmJ 1 Reply Last reply
        1
        • JonBJ JonB

          @Vivek_A said in undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceC1Ev in Qt?:

          g++: error: C:\mongo-cxx-driver\lib\llibbsoncxx.dll: No such file or directory

          Originally you had -llibbsoncxx.dll. I am thinking the leading -l was an argument to the linker, followed by the DLL file name? Which would make it LIBS += C:/mongo-cxx-driver/lib/libbsoncxx.dll (only one l)?

          However, this is a separate matter from whether you should be specifying a .dll here, I thought you would need either a .lib (MSVC) or a .a (MinGW)...?

          jsulmJ Offline
          jsulmJ Offline
          jsulm
          Lifetime Qt Champion
          wrote on last edited by
          #8

          @JonB I wanted the OP to find that out :-) This is something a developer should do first before asking in a forum. Really basic stuff.

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

          JonBJ 1 Reply Last reply
          0
          • jsulmJ jsulm

            @JonB I wanted the OP to find that out :-) This is something a developer should do first before asking in a forum. Really basic stuff.

            JonBJ Offline
            JonBJ Offline
            JonB
            wrote on last edited by JonB
            #9

            @jsulm
            Whoops, sorry for treading on your toes!

            However I have amended my answer above since you saw it. Is one supposed to specify any DLL file in LIBS += ...?

            jsulmJ 1 Reply Last reply
            0
            • JonBJ JonB

              @jsulm
              Whoops, sorry for treading on your toes!

              However I have amended my answer above since you saw it. Is one supposed to specify any DLL file in LIBS += ...?

              jsulmJ Offline
              jsulmJ Offline
              jsulm
              Lifetime Qt Champion
              wrote on last edited by
              #10

              @JonB It should be .lib, yes. But OP claims there is no .lib file, but I'm not a Windows developer.

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

              JonBJ Vivek_AV 2 Replies Last reply
              0
              • jsulmJ jsulm

                @JonB It should be .lib, yes. But OP claims there is no .lib file, but I'm not a Windows developer.

                JonBJ Offline
                JonBJ Offline
                JonB
                wrote on last edited by
                #11

                @jsulm
                A .lib will not do him, as he is using MinGW/gcc. I now see he wrote earlier:

                full file is llibmongocxx.dll.a

                That is an unusual naming convention! If that is really the case, and applies to llibbsoncxx.dll.a too, then it would indeed seem to be as he wrote. But the error message

                g++: error: C:\mongo-cxx-driver\lib\llibbsoncxx.dll: No such file or directory
                

                shows what MinGW seems actually to be looking for, no mention of a .a suffix. So I'm not sure what is going on....

                1 Reply Last reply
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                • jsulmJ jsulm

                  @JonB It should be .lib, yes. But OP claims there is no .lib file, but I'm not a Windows developer.

                  Vivek_AV Offline
                  Vivek_AV Offline
                  Vivek_A
                  wrote on last edited by Vivek_A
                  #12

                  @jsulm ok, i understand idid this

                  LIBS += C:/mongo-cxx-driver/lib/libbsoncxx.dll.a
                  
                  INCLUDEPATH += C:/mongo-cxx-driver/include/mongocxx/v_noabi
                  DEPENDPATH += C:/mongo-cxx-driver/include/mongocxx/v_noabi
                  

                  included but error that said first remains

                  ./release\main.o:main.cpp:(.text+0x1d): undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceC1Ev'
                  ./release\main.o:main.cpp:(.text+0xee): undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceD1Ev'
                  ./release\main.o:main.cpp:(.text+0x14e): undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceD1Ev'
                  

                  if you dont know about windows side of this , then its ok.
                  @JonB i have doubt , the compiler is mingw 32 and i build the mongdb in mingw 64 is this makes any issues

                  jsulmJ JonBJ 2 Replies Last reply
                  0
                  • Vivek_AV Vivek_A

                    @jsulm ok, i understand idid this

                    LIBS += C:/mongo-cxx-driver/lib/libbsoncxx.dll.a
                    
                    INCLUDEPATH += C:/mongo-cxx-driver/include/mongocxx/v_noabi
                    DEPENDPATH += C:/mongo-cxx-driver/include/mongocxx/v_noabi
                    

                    included but error that said first remains

                    ./release\main.o:main.cpp:(.text+0x1d): undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceC1Ev'
                    ./release\main.o:main.cpp:(.text+0xee): undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceD1Ev'
                    ./release\main.o:main.cpp:(.text+0x14e): undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceD1Ev'
                    

                    if you dont know about windows side of this , then its ok.
                    @JonB i have doubt , the compiler is mingw 32 and i build the mongdb in mingw 64 is this makes any issues

                    jsulmJ Offline
                    jsulmJ Offline
                    jsulm
                    Lifetime Qt Champion
                    wrote on last edited by
                    #13

                    @Vivek_A You need to link at least one more lib containing the missing symbols (libmongocxx I guess).

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

                    1 Reply Last reply
                    2
                    • Vivek_AV Vivek_A

                      @jsulm ok, i understand idid this

                      LIBS += C:/mongo-cxx-driver/lib/libbsoncxx.dll.a
                      
                      INCLUDEPATH += C:/mongo-cxx-driver/include/mongocxx/v_noabi
                      DEPENDPATH += C:/mongo-cxx-driver/include/mongocxx/v_noabi
                      

                      included but error that said first remains

                      ./release\main.o:main.cpp:(.text+0x1d): undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceC1Ev'
                      ./release\main.o:main.cpp:(.text+0xee): undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceD1Ev'
                      ./release\main.o:main.cpp:(.text+0x14e): undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceD1Ev'
                      

                      if you dont know about windows side of this , then its ok.
                      @JonB i have doubt , the compiler is mingw 32 and i build the mongdb in mingw 64 is this makes any issues

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

                      @Vivek_A said in undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceC1Ev in Qt?:

                      LIBS += C:/mongo-cxx-driver/lib/libbsoncxx.dll.a

                      This looks much more reasonable than before!

                      Now as @jsulm says it looks like you need some further similars for other library files required to link successfully.

                      @JonB i have doubt , the compiler is mingw 32 and i build the mongdb in mingw 64 is this makes any issues

                      I am not sure what you are saying. It will not be possible to mix 64-bit-compiled code with 32-bit-compiled code in one executable. The compiler's bit-ness is not at issue, rather only whichever bit-ness it is generating code for.

                      Start by trying what @jsulm has pointed out, then deal with bit-ness if there is still an error.....

                      1 Reply Last reply
                      2
                      • Vivek_AV Offline
                        Vivek_AV Offline
                        Vivek_A
                        wrote on last edited by
                        #15

                        @JonB modified

                        LIBS += C:/mongo-cxx-driver/lib/libbsoncxx.dll.a
                        LIBS += C:/mongo-cxx-driver/lib/libmongocxx.dll.a
                        INCLUDEPATH += C:/mongo-cxx-driver/include/mongocxx/v_noabi
                        DEPENDPATH += C:/mongo-cxx-driver/include/mongocxx/v_noabi
                        
                        INCLUDEPATH += C:/mongo-cxx-driver/include/bsoncxx/v_noabi
                        DEPENDPATH += C:/mongo-cxx-driver/include/bsoncxx/v_noabi
                        

                        clean & rebuilded
                        Output:

                        ./release\main.o:main.cpp:(.text+0x19): undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceC1Ev'
                        ./release\main.o:main.cpp:(.text+0x23): undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceD1Ev'
                        collect2.exe: error: ld returned 1 exit status
                        
                        Vivek_AV 1 Reply Last reply
                        0
                        • Vivek_AV Vivek_A

                          @JonB modified

                          LIBS += C:/mongo-cxx-driver/lib/libbsoncxx.dll.a
                          LIBS += C:/mongo-cxx-driver/lib/libmongocxx.dll.a
                          INCLUDEPATH += C:/mongo-cxx-driver/include/mongocxx/v_noabi
                          DEPENDPATH += C:/mongo-cxx-driver/include/mongocxx/v_noabi
                          
                          INCLUDEPATH += C:/mongo-cxx-driver/include/bsoncxx/v_noabi
                          DEPENDPATH += C:/mongo-cxx-driver/include/bsoncxx/v_noabi
                          

                          clean & rebuilded
                          Output:

                          ./release\main.o:main.cpp:(.text+0x19): undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceC1Ev'
                          ./release\main.o:main.cpp:(.text+0x23): undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceD1Ev'
                          collect2.exe: error: ld returned 1 exit status
                          
                          Vivek_AV Offline
                          Vivek_AV Offline
                          Vivek_A
                          wrote on last edited by
                          #16

                          @Vivek_A anybody help...is that compiler problem

                          ./debug\main.o: In function `Z5qMainiPPc':
                          E:/vivek/dw_tdoa_controller7/dw_tdoa_controller/main.cpp:36: undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceC1Ev'
                          E:/vivek/dw_tdoa_controller7/dw_tdoa_controller/main.cpp:36: undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceD1Ev'
                          E:/vivek/dw_tdoa_controller7/dw_tdoa_controller/main.cpp:36: undefined reference to `_imp___ZN8mongocxx7v_noabi8instanceD1Ev'
                          collect2.exe: error: ld returned 1 exit status
                          
                          
                          Makefile:36: recipe for target 'debug' failed
                          mingw32-make[1]: *** [debug\RTLSController.exe] Error 1
                          mingw32-make: *** [debug] Error 2
                          17:25:51: The process "C:\Qt\Qt5.11.2\Tools\mingw530_32\bin\mingw32-make.exe" exited with code 2.
                          Error while building/deploying project dw_controller (kit: Desktop Qt 5.11.2 MinGW 32bit)
                          When executing step "Make"
                          
                          1 Reply Last reply
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                          • SGaistS Offline
                            SGaistS Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on last edited by
                            #17

                            Try inverting the order of the libraries you are linking.

                            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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                            • Vivek_AV Offline
                              Vivek_AV Offline
                              Vivek_A
                              wrote on last edited by Vivek_A
                              #18

                              @SGaist tried , still same error , i think its not in the linking of lib, may be the installation or compiler problem... what u think???

                              mrjjM 1 Reply Last reply
                              0
                              • Vivek_AV Vivek_A

                                @SGaist tried , still same error , i think its not in the linking of lib, may be the installation or compiler problem... what u think???

                                mrjjM Offline
                                mrjjM Offline
                                mrjj
                                Lifetime Qt Champion
                                wrote on last edited by
                                #19

                                @Vivek_A

                                Hi
                                I saw this line
                                building/deploying project dw_controller (kit: Desktop Qt 5.11.2 MinGW 32bit)

                                but you said " its build using mingw64 "

                                So are your 32 bit app trying to load 64 bit DLL ?

                                Vivek_AV 1 Reply Last reply
                                0
                                • mrjjM mrjj

                                  @Vivek_A

                                  Hi
                                  I saw this line
                                  building/deploying project dw_controller (kit: Desktop Qt 5.11.2 MinGW 32bit)

                                  but you said " its build using mingw64 "

                                  So are your 32 bit app trying to load 64 bit DLL ?

                                  Vivek_AV Offline
                                  Vivek_AV Offline
                                  Vivek_A
                                  wrote on last edited by
                                  #20

                                  @mrjj hi sir, i build and installed mongocxx driver using ming64. The app running in Qt is Desktop Qt 5.11.2 MinGW 32bit, ie a mingw 32 bit compiler
                                  32cea6be-46de-4793-820b-4fc7a9d94cde-image.png

                                  1 Reply Last reply
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                                  • SGaistS Offline
                                    SGaistS Offline
                                    SGaist
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #21

                                    The question is: did you build the MongoDB C++ library in 32 or 64 bit ?

                                    If the later then you can't use them with to build a 32bit application. Beside compiler, architecture matters as well. You can't mix and match 32 and 64 bit when building librairies or applications.

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

                                    Vivek_AV 1 Reply Last reply
                                    2
                                    • SGaistS SGaist

                                      The question is: did you build the MongoDB C++ library in 32 or 64 bit ?

                                      If the later then you can't use them with to build a 32bit application. Beside compiler, architecture matters as well. You can't mix and match 32 and 64 bit when building librairies or applications.

                                      Vivek_AV Offline
                                      Vivek_AV Offline
                                      Vivek_A
                                      wrote on last edited by
                                      #22
                                      This post is deleted!
                                      1 Reply Last reply
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                                      • Vivek_AV Offline
                                        Vivek_AV Offline
                                        Vivek_A
                                        wrote on last edited by
                                        #23

                                        my compiler is mingw32bit and mongocxx driver build in 64 bit . so thats make problem , i solved it by installing 64bit Qt.

                                        1 Reply Last reply
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