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  4. Qt 5.11.3 works fine, but Qt 5.12.1 throws LINKER errors
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Qt 5.11.3 works fine, but Qt 5.12.1 throws LINKER errors

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  • Christian EhrlicherC Christian Ehrlicher

    So how to you link against the netlib library? Are you sure the netlib library is linked with the same compiler as Qt?

    M Offline
    M Offline
    m3g1dd
    wrote on last edited by
    #4

    @Christian-Ehrlicher

    The linking to net-library is done inside *.pro file:

    win32:CONFIG(release, debug|release): LIBS += -L$$OUT_PWD/../netlib/release/ -lnetlib
    else:win32:CONFIG(debug, debug|release): LIBS += -L$$OUT_PWD/../netlib/debug/ -lnetlib
    else:unix: LIBS += -L$$OUT_PWD/../netlib/ -lnetlib
    
    INCLUDEPATH += $$PWD/../netlib
    DEPENDPATH += $$PWD/../netlib
    
    1 Reply Last reply
    0
    • Christian EhrlicherC Christian Ehrlicher

      So how to you link against the netlib library? Are you sure the netlib library is linked with the same compiler as Qt?

      M Offline
      M Offline
      m3g1dd
      wrote on last edited by
      #5

      @Christian-Ehrlicher

      The compile which I'm using is MSVC2017_64bit :

      0_1552284678534_5763dfd5-db4b-4072-a483-eb3481b83aca-image.png

      0_1552284745737_5357e532-9eb7-4db9-beac-bcf8f1db78e0-image.png

      1 Reply Last reply
      0
      • Christian EhrlicherC Offline
        Christian EhrlicherC Offline
        Christian Ehrlicher
        Lifetime Qt Champion
        wrote on last edited by
        #6

        MSVC needs the correct path instead -L and -l afaik
        https://doc.qt.io/qt-5/qmake-variable-reference.html#libs

        Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
        Visit the Qt Academy at https://academy.qt.io/catalog

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        2
        • Christian EhrlicherC Christian Ehrlicher

          MSVC needs the correct path instead -L and -l afaik
          https://doc.qt.io/qt-5/qmake-variable-reference.html#libs

          M Offline
          M Offline
          m3g1dd
          wrote on last edited by
          #7

          @Christian-Ehrlicher

          Thanks :) The strange point is that I have two more libraries which I'm linking against with the same approach without any issue. But only this net library is giving me troubles!

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          0
          • Christian EhrlicherC Offline
            Christian EhrlicherC Offline
            Christian Ehrlicher
            Lifetime Qt Champion
            wrote on last edited by
            #8

            Maybe the function is not properly exported? Maybe take a look at the exported function declarations with Dependency Walker - make sure the export string (_imp?registerNetLibraryQML@NetLibrary@@YAXXZ) shown there looks exactly the same.

            Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
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            2
            • Christian EhrlicherC Christian Ehrlicher

              Maybe the function is not properly exported? Maybe take a look at the exported function declarations with Dependency Walker - make sure the export string (_imp?registerNetLibraryQML@NetLibrary@@YAXXZ) shown there looks exactly the same.

              M Offline
              M Offline
              m3g1dd
              wrote on last edited by
              #9

              @Christian-Ehrlicher

              Good idea :) I'm going to employ dependency walker tools

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              0
              • Christian EhrlicherC Christian Ehrlicher

                Maybe the function is not properly exported? Maybe take a look at the exported function declarations with Dependency Walker - make sure the export string (_imp?registerNetLibraryQML@NetLibrary@@YAXXZ) shown there looks exactly the same.

                M Offline
                M Offline
                m3g1dd
                wrote on last edited by
                #10

                @Christian-Ehrlicher

                I double-checked my netlib DLL with dependency walker, I can see the export:

                0_1552303570459_5fc43f6a-1a49-4307-b5b4-156b5e8b1a6c-image.png

                Also, on my main.obj I can see the import:

                0_1552303780368_7fcee3d7-1947-477a-8391-4ff3c54e5ef9-image.png

                hskoglundH 1 Reply Last reply
                0
                • Christian EhrlicherC Offline
                  Christian EhrlicherC Offline
                  Christian Ehrlicher
                  Lifetime Qt Champion
                  wrote on last edited by
                  #11

                  I've no idea - does the linker really links against the import lib? Are other functions from within the library are resolved?

                  Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
                  Visit the Qt Academy at https://academy.qt.io/catalog

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                  0
                  • M m3g1dd

                    @Christian-Ehrlicher

                    I double-checked my netlib DLL with dependency walker, I can see the export:

                    0_1552303570459_5fc43f6a-1a49-4307-b5b4-156b5e8b1a6c-image.png

                    Also, on my main.obj I can see the import:

                    0_1552303780368_7fcee3d7-1947-477a-8391-4ff3c54e5ef9-image.png

                    hskoglundH Offline
                    hskoglundH Offline
                    hskoglund
                    wrote on last edited by
                    #12

                    @m3g1dd While checking the netlib DLL is a good thing for avoiding failures when launching your application.exe (when the .dll is loaded), here the error occurs not when running the app, but when linking it, So the .dll is immaterial, you could instead check the netlib.lib file, that's what the linker is reading.

                    Dependency Walker isn't well suited for reading .lib files, but there's a tool in MSVC2017 called dumpbin, easiest is to start it from a Developer Command Prompt for VS 2017. To get the complete information, use the /linkermember switch, say like this:

                    dumpbin /linkermember netlib.lib
                    

                    Then check in the list if that symbol is exported, it should be 2 of them, one __imp?registerNetLibraryQML@NetLibrary@@YAXXZ and one ?registerNetLibraryQML@NetLibrary@@YAXXZ

                    M 1 Reply Last reply
                    3
                    • hskoglundH hskoglund

                      @m3g1dd While checking the netlib DLL is a good thing for avoiding failures when launching your application.exe (when the .dll is loaded), here the error occurs not when running the app, but when linking it, So the .dll is immaterial, you could instead check the netlib.lib file, that's what the linker is reading.

                      Dependency Walker isn't well suited for reading .lib files, but there's a tool in MSVC2017 called dumpbin, easiest is to start it from a Developer Command Prompt for VS 2017. To get the complete information, use the /linkermember switch, say like this:

                      dumpbin /linkermember netlib.lib
                      

                      Then check in the list if that symbol is exported, it should be 2 of them, one __imp?registerNetLibraryQML@NetLibrary@@YAXXZ and one ?registerNetLibraryQML@NetLibrary@@YAXXZ

                      M Offline
                      M Offline
                      m3g1dd
                      wrote on last edited by m3g1dd
                      #13

                      @hskoglund

                      Thanks! I run the command on Developer Command Prompt for VS 2017 and I get the results, I can see both ?registerNetLibraryQML@NetLibrary@@YAXXZ and __imp_?registerNetLibraryQML@NetLibrary@@YAXXZ expressions:

                      C:\Users\me\repos\build-application-Desktop_Qt_5_12_1_MSVC2017_64bit-Debug\netlib\debug>dumpbin /linkermember netlib.lib
                      Microsoft (R) COFF/PE Dumper Version 14.15.26730.0
                      Copyright (C) Microsoft Corporation.  All rights reserved.
                      
                      
                      Dump of file netlib.lib
                      
                      File Type: LIBRARY
                      
                      Archive member name at 8: /
                      FFFFFFFF time/date
                               uid
                               gid
                             0 mode
                           C3D size
                      correct header end
                      
                          69 public symbols
                      
                           190A __IMPORT_DESCRIPTOR_netlib
                           1B30 __NULL_IMPORT_DESCRIPTOR
                           1C66 netlib_NULL_THUNK_DATA
                           2878 ?registerNetLibraryQML@NetLibrary@@YAXXZ
                           2878 __imp_?registerNetLibraryQML@NetLibrary@@YAXXZ
                           2E0C ?tr@Netlib@@SA?AVQString@@PEBD0H@Z
                           2E0C __imp_?tr@Netlib@@SA?AVQString@@PEBD0H@Z
                           2E8A ?trUtf8@Netlib@@SA?AVQString@@PEBD0H@Z
                           2E8A __imp_?trUtf8@Netlib@@SA?AVQString@@PEBD0H@Z
                           1DBE ??0Netlib@@QEAA@XZ
                           1DBE __imp_??0Netlib@@QEAA@XZ
                           1E2C ??1Netlib@@UEAA@XZ
                           1E2C __imp_??1Netlib@@UEAA@XZ
                           1F06 ?agentDiscover@Netlib@@QEAAXXZ
                           1F06 __imp_?agentDiscover@Netlib@@QEAAXXZ
                           1FFA ?agentSlice@Netlib@@QEAA_NAEBVQUrl@@AEBVQString@@V3@222@Z
                           1FFA __imp_?agentSlice@Netlib@@QEAA_NAEBVQUrl@@AEBVQString@@V3@222@Z
                           210E ?discoveryInProgress@Netlib@@QEBA_NXZ
                           210E __imp_?discoveryInProgress@Netlib@@QEBA_NXZ
                           28FC ?setDiscoveryInProgress@Netlib@@QEAAX_N@Z
                           28FC __imp_?setDiscoveryInProgress@Netlib@@QEAAX_N@Z
                           2C7E ?slicingInProgress@Netlib@@QEBA_NXZ
                           2C7E __imp_?slicingInProgress@Netlib@@QEBA_NXZ
                           2A82 ?setSlicingInProgress@Netlib@@QEAAX_N@Z
                           2A82 __imp_?setSlicingInProgress@Netlib@@QEAAX_N@Z
                           2530 ?layerID@Netlib@@QEBA?AVQString@@XZ
                           2530 __imp_?layerID@Netlib@@QEBA?AVQString@@XZ
                           2982 ?setLayerID@Netlib@@QEAAXVQString@@@Z
                           2982 __imp_?setLayerID@Netlib@@QEAAXVQString@@@Z
                           2B82 ?slicingDone@Netlib@@QEBA_NXZ
                           2B82 __imp_?slicingDone@Netlib@@QEBA_NXZ
                           2A04 ?setSlicingDone@Netlib@@QEAAX_N@Z
                           2A04 __imp_?setSlicingDone@Netlib@@QEAAX_N@Z
                           24BE ?init@Netlib@@AEAAXXZ
                           24BE __imp_?init@Netlib@@AEAAXXZ
                           22AA ?getOsName@Netlib@@AEAA?AVQString@@XZ
                           22AA __imp_?getOsName@Netlib@@AEAA?AVQString@@XZ
                           2090 ?discoveryFinished@Netlib@@AEAAXXZ
                           2090 __imp_?discoveryFinished@Netlib@@AEAAXXZ
                           2B06 ?slicerFinished@Netlib@@AEAAXXZ
                           2B06 __imp_?slicerFinished@Netlib@@AEAAXXZ
                           1F80 ?agentLogReady@Netlib@@AEAAXXZ
                           1F80 __imp_?agentLogReady@Netlib@@AEAAXXZ
                           2430 ?handleSlicingInProgressChanged@Netlib@@AEAAX_N@Z
                           2430 __imp_?handleSlicingInProgressChanged@Netlib@@AEAAX_N@Z
                           232C ?getSlicerProgress@Netlib@@AEAAXXZ
                           232C __imp_?getSlicerProgress@Netlib@@AEAAXXZ
                           23AA ?getSlicerProgressFinished@Netlib@@AEAAXXZ
                           23AA __imp_?getSlicerProgressFinished@Netlib@@AEAAXXZ
                           1E9A __imp_??_7Netlib@@6B@
                           2636 ?metaObject@Netlib@@UEBAPEBUQMetaObject@@XZ
                           2636 __imp_?metaObject@Netlib@@UEBAPEBUQMetaObject@@XZ
                           2752 ?qt_metacast@Netlib@@UEAAPEAXPEBD@Z
                           2752 __imp_?qt_metacast@Netlib@@UEAAPEAXPEBD@Z
                           26BE ?qt_metacall@Netlib@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z
                           26BE __imp_?qt_metacall@Netlib@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z
                           27D2 ?qt_static_metacall@Netlib@@CAXPEAVQObject@@W4Call@QMetaObject@@HPEAPEAX@Z
                           27D2 __imp_?qt_static_metacall@Netlib@@CAXPEAVQObject@@W4Call@QMetaObject@@HPEAPEAX@Z
                           2190 ?discoveryInProgressChanged@Netlib@@QEAAX_N@Z
                           2190 __imp_?discoveryInProgressChanged@Netlib@@QEAAX_N@Z
                           221A ?discoveryResultChanged@Netlib@@QEAAXVQJsonArray@@@Z
                           221A __imp_?discoveryResultChanged@Netlib@@QEAAXVQJsonArray@@@Z
                           2CFE ?slicingInProgressChanged@Netlib@@QEAAX_N@Z
                           2CFE __imp_?slicingInProgressChanged@Netlib@@QEAAX_N@Z
                           25B0 ?layerIDChanged@Netlib@@QEAAXVQString@@@Z
                           25B0 __imp_?layerIDChanged@Netlib@@QEAAXVQString@@@Z
                           2BFC ?slicingDoneChanged@Netlib@@QEAAX_N@Z
                           2BFC __imp_?slicingDoneChanged@Netlib@@QEAAX_N@Z
                           2D86 __imp_?staticMetaObject@Netlib@@2UQMetaObject@@B
                      
                      Archive member name at C82: /
                      FFFFFFFF time/date
                               uid
                               gid
                             0 mode
                           C4B size
                      correct header end
                      
                          37 offsets
                      
                              1     190A
                              2     1B30
                              3     1C66
                              4     2878
                              5     2E0C
                              6     2E8A
                              7     1DBE
                              8     1E2C
                              9     1F06
                              A     1FFA
                              B     210E
                              C     28FC
                              D     2C7E
                              E     2A82
                              F     2530
                             10     2982
                             11     2B82
                             12     2A04
                             13     24BE
                             14     22AA
                             15     2090
                             16     2B06
                             17     1F80
                             18     2430
                             19     232C
                             1A     23AA
                             1B     1E9A
                             1C     2636
                             1D     2752
                             1E     26BE
                             1F     27D2
                             20     2190
                             21     221A
                             22     2CFE
                             23     25B0
                             24     2BFC
                             25     2D86
                      
                          69 public symbols
                      
                              7 ??0Netlib@@QEAA@XZ
                              8 ??1Netlib@@UEAA@XZ
                              9 ?agentDiscover@Netlib@@QEAAXXZ
                             17 ?agentLogReady@Netlib@@AEAAXXZ
                              A ?agentSlice@Netlib@@QEAA_NAEBVQUrl@@AEBVQString@@V3@222@Z
                             15 ?discoveryFinished@Netlib@@AEAAXXZ
                              B ?discoveryInProgress@Netlib@@QEBA_NXZ
                             20 ?discoveryInProgressChanged@Netlib@@QEAAX_N@Z
                             21 ?discoveryResultChanged@Netlib@@QEAAXVQJsonArray@@@Z
                             14 ?getOsName@Netlib@@AEAA?AVQString@@XZ
                             19 ?getSlicerProgress@Netlib@@AEAAXXZ
                             1A ?getSlicerProgressFinished@Netlib@@AEAAXXZ
                             18 ?handleSlicingInProgressChanged@Netlib@@AEAAX_N@Z
                             13 ?init@Netlib@@AEAAXXZ
                              F ?layerID@Netlib@@QEBA?AVQString@@XZ
                             23 ?layerIDChanged@Netlib@@QEAAXVQString@@@Z
                             1C ?metaObject@Netlib@@UEBAPEBUQMetaObject@@XZ
                             1E ?qt_metacall@Netlib@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z
                             1D ?qt_metacast@Netlib@@UEAAPEAXPEBD@Z
                             1F ?qt_static_metacall@Netlib@@CAXPEAVQObject@@W4Call@QMetaObject@@HPEAPEAX@Z
                              4 ?registerNetLibraryQML@NetLibrary@@YAXXZ
                              C ?setDiscoveryInProgress@Netlib@@QEAAX_N@Z
                             10 ?setLayerID@Netlib@@QEAAXVQString@@@Z
                             12 ?setSlicingDone@Netlib@@QEAAX_N@Z
                              E ?setSlicingInProgress@Netlib@@QEAAX_N@Z
                             16 ?slicerFinished@Netlib@@AEAAXXZ
                             11 ?slicingDone@Netlib@@QEBA_NXZ
                             24 ?slicingDoneChanged@Netlib@@QEAAX_N@Z
                              D ?slicingInProgress@Netlib@@QEBA_NXZ
                             22 ?slicingInProgressChanged@Netlib@@QEAAX_N@Z
                              5 ?tr@Netlib@@SA?AVQString@@PEBD0H@Z
                              6 ?trUtf8@Netlib@@SA?AVQString@@PEBD0H@Z
                              1 __IMPORT_DESCRIPTOR_netlib
                              2 __NULL_IMPORT_DESCRIPTOR
                              7 __imp_??0Netlib@@QEAA@XZ
                              8 __imp_??1Netlib@@UEAA@XZ
                             1B __imp_??_7Netlib@@6B@
                              9 __imp_?agentDiscover@Netlib@@QEAAXXZ
                             17 __imp_?agentLogReady@Netlib@@AEAAXXZ
                              A __imp_?agentSlice@Netlib@@QEAA_NAEBVQUrl@@AEBVQString@@V3@222@Z
                             15 __imp_?discoveryFinished@Netlib@@AEAAXXZ
                              B __imp_?discoveryInProgress@Netlib@@QEBA_NXZ
                             20 __imp_?discoveryInProgressChanged@Netlib@@QEAAX_N@Z
                             21 __imp_?discoveryResultChanged@Netlib@@QEAAXVQJsonArray@@@Z
                             14 __imp_?getOsName@Netlib@@AEAA?AVQString@@XZ
                             19 __imp_?getSlicerProgress@Netlib@@AEAAXXZ
                             1A __imp_?getSlicerProgressFinished@Netlib@@AEAAXXZ
                             18 __imp_?handleSlicingInProgressChanged@Netlib@@AEAAX_N@Z
                             13 __imp_?init@Netlib@@AEAAXXZ
                              F __imp_?layerID@Netlib@@QEBA?AVQString@@XZ
                             23 __imp_?layerIDChanged@Netlib@@QEAAXVQString@@@Z
                             1C __imp_?metaObject@Netlib@@UEBAPEBUQMetaObject@@XZ
                             1E __imp_?qt_metacall@Netlib@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z
                             1D __imp_?qt_metacast@Netlib@@UEAAPEAXPEBD@Z
                             1F __imp_?qt_static_metacall@Netlib@@CAXPEAVQObject@@W4Call@QMetaObject@@HPEAPEAX@Z
                              4 __imp_?registerNetLibraryQML@NetLibrary@@YAXXZ
                              C __imp_?setDiscoveryInProgress@Netlib@@QEAAX_N@Z
                             10 __imp_?setLayerID@Netlib@@QEAAXVQString@@@Z
                             12 __imp_?setSlicingDone@Netlib@@QEAAX_N@Z
                              E __imp_?setSlicingInProgress@Netlib@@QEAAX_N@Z
                             16 __imp_?slicerFinished@Netlib@@AEAAXXZ
                             11 __imp_?slicingDone@Netlib@@QEBA_NXZ
                             24 __imp_?slicingDoneChanged@Netlib@@QEAAX_N@Z
                              D __imp_?slicingInProgress@Netlib@@QEBA_NXZ
                             22 __imp_?slicingInProgressChanged@Netlib@@QEAAX_N@Z
                             25 __imp_?staticMetaObject@Netlib@@2UQMetaObject@@B
                              5 __imp_?tr@Netlib@@SA?AVQString@@PEBD0H@Z
                              6 __imp_?trUtf8@Netlib@@SA?AVQString@@PEBD0H@Z
                              3 netlib_NULL_THUNK_DATA
                      
                        Summary
                      
                                C0 .debug$S
                                14 .idata$2
                                14 .idata$3
                                 8 .idata$4
                                 8 .idata$5
                                 C .idata$6
                      
                      1 Reply Last reply
                      0
                      • Christian EhrlicherC Christian Ehrlicher

                        I've no idea - does the linker really links against the import lib? Are other functions from within the library are resolved?

                        M Offline
                        M Offline
                        m3g1dd
                        wrote on last edited by
                        #14

                        @Christian-Ehrlicher

                        Thanks! Yes, other functions of netlib are linked fine. I will update if I figure out the cause :)

                        1 Reply Last reply
                        0
                        • hskoglundH Offline
                          hskoglundH Offline
                          hskoglund
                          wrote on last edited by
                          #15

                          Hi, just to check, what version of MSVC did you use for Qt 5.11.3 (when the linking worked), was it MSVC 2017 32-bit or MSVC 2017 64-bit?

                          M 1 Reply Last reply
                          0
                          • hskoglundH hskoglund

                            Hi, just to check, what version of MSVC did you use for Qt 5.11.3 (when the linking worked), was it MSVC 2017 32-bit or MSVC 2017 64-bit?

                            M Offline
                            M Offline
                            m3g1dd
                            wrote on last edited by
                            #16

                            @hskoglund

                            Hi! Thanks for follow up :)

                            For Qt 5.11.3 I'm using MSVC2017_64bit which works fine. My build directories are:

                            build-application-Desktop_Qt_5_11_3_MSVC2017_64bit-Debug
                            build-application-Desktop_Qt_5_11_3_MSVC2017_64bit-Release
                            build-application-Desktop_Qt_5_12_1_MSVC2017_64bit-Debug
                            
                            1 Reply Last reply
                            0
                            • M Offline
                              M Offline
                              m3g1dd
                              wrote on last edited by m3g1dd
                              #17

                              New observation: I installed Qt5.12.0 and my application compiles/links/runs just fine. I'm going to re-install Qt5.12.1 ... I have a feeling maybe re-installing it will resolve linker errors ... lets see ...

                              1 Reply Last reply
                              0
                              • M Offline
                                M Offline
                                m3g1dd
                                wrote on last edited by
                                #18

                                I reinstalled Qt 5.12.1 but it still throws the above-mentioned linker error. So basically, my observation is:

                                1. On Windows, Qt 5.11.3 and 5.12.0 work fine
                                2. On Windows, Qt 5.12.1 throws linker error
                                3. On Linux openSUSE Leap 15, Qt 5.12.1 works fine
                                1 Reply Last reply
                                0
                                • hskoglundH Offline
                                  hskoglundH Offline
                                  hskoglund
                                  wrote on last edited by
                                  #19

                                  Hmm, just to check again: release builds and debug builds on 5.12.0 MSVC 2017 links fine and dandy, but the same linker throws a tantrum both for release and debug builds on 5.12.1 MSVC 2017.

                                  Also, could do you a similar dumpbin on a 5.12.0 debug built netlib.lib as you did above for a 5.12.1 debug build?

                                  M 2 Replies Last reply
                                  2
                                  • hskoglundH hskoglund

                                    Hmm, just to check again: release builds and debug builds on 5.12.0 MSVC 2017 links fine and dandy, but the same linker throws a tantrum both for release and debug builds on 5.12.1 MSVC 2017.

                                    Also, could do you a similar dumpbin on a 5.12.0 debug built netlib.lib as you did above for a 5.12.1 debug build?

                                    M Offline
                                    M Offline
                                    m3g1dd
                                    wrote on last edited by
                                    #20

                                    @hskoglund

                                    Let me double-check everything again ... I'll give an update ...

                                    1 Reply Last reply
                                    0
                                    • hskoglundH hskoglund

                                      Hmm, just to check again: release builds and debug builds on 5.12.0 MSVC 2017 links fine and dandy, but the same linker throws a tantrum both for release and debug builds on 5.12.1 MSVC 2017.

                                      Also, could do you a similar dumpbin on a 5.12.0 debug built netlib.lib as you did above for a 5.12.1 debug build?

                                      M Offline
                                      M Offline
                                      m3g1dd
                                      wrote on last edited by
                                      #21

                                      @hskoglund

                                      I double-checked to make sure nothing is missed:

                                      1. Qt_5_12_0_MSVC2017_64bit-Debug links fine and application runs :)
                                      2. Qt_5_12_0_MSVC2017_64bit-Release links fine and application runs :)
                                      3. Qt_5_12_1_MSVC2017_64bit-Debug throws:

                                      main.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) void __cdecl NetLibrary::registerNetLibraryQML(void)" (_imp?registerNetLibraryQML@NetLibrary@@YAXXZ) referenced in function main

                                      1. Qt_5_12_1_MSVC2017_64bit-Release throws:

                                      main.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) void __cdecl NetLibrary::registerNetLibraryQML(void)" (_imp?registerNetLibraryQML@NetLibrary@@YAXXZ) referenced in function main


                                      Also, here is the dumpbin for netlib.lib on Qt_5_12_0_MSVC2017_64bit-Debug which links fine and works nice:

                                      C:\Users\me\repos\build-application-Desktop_Qt_5_12_0_MSVC2017_64bit-Debug\netlib\debug>dumpbin /linkermember netlib.lib
                                      Microsoft (R) COFF/PE Dumper Version 14.15.26730.0
                                      Copyright (C) Microsoft Corporation.  All rights reserved.
                                      
                                      
                                      Dump of file netlib.lib
                                      
                                      File Type: LIBRARY
                                      
                                      Archive member name at 8: /
                                      FFFFFFFF time/date
                                               uid
                                               gid
                                             0 mode
                                           C3D size
                                      correct header end
                                      
                                          69 public symbols
                                      
                                           190A __IMPORT_DESCRIPTOR_netlib
                                           1B30 __NULL_IMPORT_DESCRIPTOR
                                           1C66 netlib_NULL_THUNK_DATA
                                           2878 ?registerNetLibraryQML@NetLibrary@@YAXXZ
                                           2878 __imp_?registerNetLibraryQML@NetLibrary@@YAXXZ
                                           2E0C ?tr@Netlib@@SA?AVQString@@PEBD0H@Z
                                           2E0C __imp_?tr@Netlib@@SA?AVQString@@PEBD0H@Z
                                           2E8A ?trUtf8@Netlib@@SA?AVQString@@PEBD0H@Z
                                           2E8A __imp_?trUtf8@Netlib@@SA?AVQString@@PEBD0H@Z
                                           1DBE ??0Netlib@@QEAA@XZ
                                           1DBE __imp_??0Netlib@@QEAA@XZ
                                           1E2C ??1Netlib@@UEAA@XZ
                                           1E2C __imp_??1Netlib@@UEAA@XZ
                                           1F06 ?agentDiscover@Netlib@@QEAAXXZ
                                           1F06 __imp_?agentDiscover@Netlib@@QEAAXXZ
                                           1FFA ?agentSlice@Netlib@@QEAA_NAEBVQUrl@@AEBVQString@@V3@222@Z
                                           1FFA __imp_?agentSlice@Netlib@@QEAA_NAEBVQUrl@@AEBVQString@@V3@222@Z
                                           210E ?discoveryInProgress@Netlib@@QEBA_NXZ
                                           210E __imp_?discoveryInProgress@Netlib@@QEBA_NXZ
                                           28FC ?setDiscoveryInProgress@Netlib@@QEAAX_N@Z
                                           28FC __imp_?setDiscoveryInProgress@Netlib@@QEAAX_N@Z
                                           2C7E ?slicingInProgress@Netlib@@QEBA_NXZ
                                           2C7E __imp_?slicingInProgress@Netlib@@QEBA_NXZ
                                           2A82 ?setSlicingInProgress@Netlib@@QEAAX_N@Z
                                           2A82 __imp_?setSlicingInProgress@Netlib@@QEAAX_N@Z
                                           2530 ?layerID@Netlib@@QEBA?AVQString@@XZ
                                           2530 __imp_?layerID@Netlib@@QEBA?AVQString@@XZ
                                           2982 ?setLayerID@Netlib@@QEAAXVQString@@@Z
                                           2982 __imp_?setLayerID@Netlib@@QEAAXVQString@@@Z
                                           2B82 ?slicingDone@Netlib@@QEBA_NXZ
                                           2B82 __imp_?slicingDone@Netlib@@QEBA_NXZ
                                           2A04 ?setSlicingDone@Netlib@@QEAAX_N@Z
                                           2A04 __imp_?setSlicingDone@Netlib@@QEAAX_N@Z
                                           24BE ?init@Netlib@@AEAAXXZ
                                           24BE __imp_?init@Netlib@@AEAAXXZ
                                           22AA ?getOsName@Netlib@@AEAA?AVQString@@XZ
                                           22AA __imp_?getOsName@Netlib@@AEAA?AVQString@@XZ
                                           2090 ?discoveryFinished@Netlib@@AEAAXXZ
                                           2090 __imp_?discoveryFinished@Netlib@@AEAAXXZ
                                           2B06 ?slicerFinished@Netlib@@AEAAXXZ
                                           2B06 __imp_?slicerFinished@Netlib@@AEAAXXZ
                                           1F80 ?agentLogReady@Netlib@@AEAAXXZ
                                           1F80 __imp_?agentLogReady@Netlib@@AEAAXXZ
                                           2430 ?handleSlicingInProgressChanged@Netlib@@AEAAX_N@Z
                                           2430 __imp_?handleSlicingInProgressChanged@Netlib@@AEAAX_N@Z
                                           232C ?getSlicerProgress@Netlib@@AEAAXXZ
                                           232C __imp_?getSlicerProgress@Netlib@@AEAAXXZ
                                           23AA ?getSlicerProgressFinished@Netlib@@AEAAXXZ
                                           23AA __imp_?getSlicerProgressFinished@Netlib@@AEAAXXZ
                                           1E9A __imp_??_7Netlib@@6B@
                                           2636 ?metaObject@Netlib@@UEBAPEBUQMetaObject@@XZ
                                           2636 __imp_?metaObject@Netlib@@UEBAPEBUQMetaObject@@XZ
                                           2752 ?qt_metacast@Netlib@@UEAAPEAXPEBD@Z
                                           2752 __imp_?qt_metacast@Netlib@@UEAAPEAXPEBD@Z
                                           26BE ?qt_metacall@Netlib@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z
                                           26BE __imp_?qt_metacall@Netlib@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z
                                           27D2 ?qt_static_metacall@Netlib@@CAXPEAVQObject@@W4Call@QMetaObject@@HPEAPEAX@Z
                                           27D2 __imp_?qt_static_metacall@Netlib@@CAXPEAVQObject@@W4Call@QMetaObject@@HPEAPEAX@Z
                                           2190 ?discoveryInProgressChanged@Netlib@@QEAAX_N@Z
                                           2190 __imp_?discoveryInProgressChanged@Netlib@@QEAAX_N@Z
                                           221A ?discoveryResultChanged@Netlib@@QEAAXVQJsonArray@@@Z
                                           221A __imp_?discoveryResultChanged@Netlib@@QEAAXVQJsonArray@@@Z
                                           2CFE ?slicingInProgressChanged@Netlib@@QEAAX_N@Z
                                           2CFE __imp_?slicingInProgressChanged@Netlib@@QEAAX_N@Z
                                           25B0 ?layerIDChanged@Netlib@@QEAAXVQString@@@Z
                                           25B0 __imp_?layerIDChanged@Netlib@@QEAAXVQString@@@Z
                                           2BFC ?slicingDoneChanged@Netlib@@QEAAX_N@Z
                                           2BFC __imp_?slicingDoneChanged@Netlib@@QEAAX_N@Z
                                           2D86 __imp_?staticMetaObject@Netlib@@2UQMetaObject@@B
                                      
                                      Archive member name at C82: /
                                      FFFFFFFF time/date
                                               uid
                                               gid
                                             0 mode
                                           C4B size
                                      correct header end
                                      
                                          37 offsets
                                      
                                              1     190A
                                              2     1B30
                                              3     1C66
                                              4     2878
                                              5     2E0C
                                              6     2E8A
                                              7     1DBE
                                              8     1E2C
                                              9     1F06
                                              A     1FFA
                                              B     210E
                                              C     28FC
                                              D     2C7E
                                              E     2A82
                                              F     2530
                                             10     2982
                                             11     2B82
                                             12     2A04
                                             13     24BE
                                             14     22AA
                                             15     2090
                                             16     2B06
                                             17     1F80
                                             18     2430
                                             19     232C
                                             1A     23AA
                                             1B     1E9A
                                             1C     2636
                                             1D     2752
                                             1E     26BE
                                             1F     27D2
                                             20     2190
                                             21     221A
                                             22     2CFE
                                             23     25B0
                                             24     2BFC
                                             25     2D86
                                      
                                          69 public symbols
                                      
                                              7 ??0Netlib@@QEAA@XZ
                                              8 ??1Netlib@@UEAA@XZ
                                              9 ?agentDiscover@Netlib@@QEAAXXZ
                                             17 ?agentLogReady@Netlib@@AEAAXXZ
                                              A ?agentSlice@Netlib@@QEAA_NAEBVQUrl@@AEBVQString@@V3@222@Z
                                             15 ?discoveryFinished@Netlib@@AEAAXXZ
                                              B ?discoveryInProgress@Netlib@@QEBA_NXZ
                                             20 ?discoveryInProgressChanged@Netlib@@QEAAX_N@Z
                                             21 ?discoveryResultChanged@Netlib@@QEAAXVQJsonArray@@@Z
                                             14 ?getOsName@Netlib@@AEAA?AVQString@@XZ
                                             19 ?getSlicerProgress@Netlib@@AEAAXXZ
                                             1A ?getSlicerProgressFinished@Netlib@@AEAAXXZ
                                             18 ?handleSlicingInProgressChanged@Netlib@@AEAAX_N@Z
                                             13 ?init@Netlib@@AEAAXXZ
                                              F ?layerID@Netlib@@QEBA?AVQString@@XZ
                                             23 ?layerIDChanged@Netlib@@QEAAXVQString@@@Z
                                             1C ?metaObject@Netlib@@UEBAPEBUQMetaObject@@XZ
                                             1E ?qt_metacall@Netlib@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z
                                             1D ?qt_metacast@Netlib@@UEAAPEAXPEBD@Z
                                             1F ?qt_static_metacall@Netlib@@CAXPEAVQObject@@W4Call@QMetaObject@@HPEAPEAX@Z
                                              4 ?registerNetLibraryQML@NetLibrary@@YAXXZ
                                              C ?setDiscoveryInProgress@Netlib@@QEAAX_N@Z
                                             10 ?setLayerID@Netlib@@QEAAXVQString@@@Z
                                             12 ?setSlicingDone@Netlib@@QEAAX_N@Z
                                              E ?setSlicingInProgress@Netlib@@QEAAX_N@Z
                                             16 ?slicerFinished@Netlib@@AEAAXXZ
                                             11 ?slicingDone@Netlib@@QEBA_NXZ
                                             24 ?slicingDoneChanged@Netlib@@QEAAX_N@Z
                                              D ?slicingInProgress@Netlib@@QEBA_NXZ
                                             22 ?slicingInProgressChanged@Netlib@@QEAAX_N@Z
                                              5 ?tr@Netlib@@SA?AVQString@@PEBD0H@Z
                                              6 ?trUtf8@Netlib@@SA?AVQString@@PEBD0H@Z
                                              1 __IMPORT_DESCRIPTOR_netlib
                                              2 __NULL_IMPORT_DESCRIPTOR
                                              7 __imp_??0Netlib@@QEAA@XZ
                                              8 __imp_??1Netlib@@UEAA@XZ
                                             1B __imp_??_7Netlib@@6B@
                                              9 __imp_?agentDiscover@Netlib@@QEAAXXZ
                                             17 __imp_?agentLogReady@Netlib@@AEAAXXZ
                                              A __imp_?agentSlice@Netlib@@QEAA_NAEBVQUrl@@AEBVQString@@V3@222@Z
                                             15 __imp_?discoveryFinished@Netlib@@AEAAXXZ
                                              B __imp_?discoveryInProgress@Netlib@@QEBA_NXZ
                                             20 __imp_?discoveryInProgressChanged@Netlib@@QEAAX_N@Z
                                             21 __imp_?discoveryResultChanged@Netlib@@QEAAXVQJsonArray@@@Z
                                             14 __imp_?getOsName@Netlib@@AEAA?AVQString@@XZ
                                             19 __imp_?getSlicerProgress@Netlib@@AEAAXXZ
                                             1A __imp_?getSlicerProgressFinished@Netlib@@AEAAXXZ
                                             18 __imp_?handleSlicingInProgressChanged@Netlib@@AEAAX_N@Z
                                             13 __imp_?init@Netlib@@AEAAXXZ
                                              F __imp_?layerID@Netlib@@QEBA?AVQString@@XZ
                                             23 __imp_?layerIDChanged@Netlib@@QEAAXVQString@@@Z
                                             1C __imp_?metaObject@Netlib@@UEBAPEBUQMetaObject@@XZ
                                             1E __imp_?qt_metacall@Netlib@@UEAAHW4Call@QMetaObject@@HPEAPEAX@Z
                                             1D __imp_?qt_metacast@Netlib@@UEAAPEAXPEBD@Z
                                             1F __imp_?qt_static_metacall@Netlib@@CAXPEAVQObject@@W4Call@QMetaObject@@HPEAPEAX@Z
                                              4 __imp_?registerNetLibraryQML@NetLibrary@@YAXXZ
                                              C __imp_?setDiscoveryInProgress@Netlib@@QEAAX_N@Z
                                             10 __imp_?setLayerID@Netlib@@QEAAXVQString@@@Z
                                             12 __imp_?setSlicingDone@Netlib@@QEAAX_N@Z
                                              E __imp_?setSlicingInProgress@Netlib@@QEAAX_N@Z
                                             16 __imp_?slicerFinished@Netlib@@AEAAXXZ
                                             11 __imp_?slicingDone@Netlib@@QEBA_NXZ
                                             24 __imp_?slicingDoneChanged@Netlib@@QEAAX_N@Z
                                              D __imp_?slicingInProgress@Netlib@@QEBA_NXZ
                                             22 __imp_?slicingInProgressChanged@Netlib@@QEAAX_N@Z
                                             25 __imp_?staticMetaObject@Netlib@@2UQMetaObject@@B
                                              5 __imp_?tr@Netlib@@SA?AVQString@@PEBD0H@Z
                                              6 __imp_?trUtf8@Netlib@@SA?AVQString@@PEBD0H@Z
                                              3 netlib_NULL_THUNK_DATA
                                      
                                        Summary
                                      
                                                C0 .debug$S
                                                14 .idata$2
                                                14 .idata$3
                                                 8 .idata$4
                                                 8 .idata$5
                                                 C .idata$6
                                      
                                      1 Reply Last reply
                                      0
                                      • hskoglundH Offline
                                        hskoglundH Offline
                                        hskoglund
                                        wrote on last edited by
                                        #22

                                        Hi, the dumpbin for 5.12.1 is identical to 5.12.0. Seems netlib.lib is the innocent guy here. So it must be the client program, i.e. your main.cpp, perhaps some kind of visibility problem. We're running out of options so I'm thinking you could try renaming your library to something less generic/vanilla (there are many other libraries called netlib.xxx out there, perhaps one of them has snuck into in 5.12.1)

                                        So say instead of netlib you could call it m3gnetlib (prefixing with half of your username).
                                        That would mean changing the .pro file, the .h and .cpp files and also the #define from NETLIBSHARED_EXPORT to M3GNETLIBSHARED_EXPORT.

                                        I remember running into similar inexplicable issues in the past, and renaming the files helped (sometimes :-)

                                        1 Reply Last reply
                                        2
                                        • M Offline
                                          M Offline
                                          mchinand
                                          wrote on last edited by mchinand
                                          #23

                                          In 5.12.1, default Windows library paths (e.g., Windows Kits) were added to the search path in qmake's makefile generator, but were added before the user-specified paths instead of after. There's already a commit to fix this and should be in 5.12.3. See this bugreport

                                          1 Reply Last reply
                                          4

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