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Qt already updated to 5.14.1, but why it still uses MSVC 2017 build tools?

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  • J.HilkJ J.Hilk

    The Qt Framework is big, has lots of features and modules and classes.

    If the new compiler only has marginal changes (like one clang/gcc version to an other) you can rather safely upgrade/support the new version after reading the changelog.

    Microsoft until recently, totally broke binary compatibility with each MSVC release and god only knows what they are currently doing.

    So upgrading / supporting a new MSVC version will require extensive testing and I assume that's simply not yet done/finished.

    I personally already run into Qtmsvc2017 and 2019 incompatibility issues. The Qt support answered me with: Thanks for the report we will look into it, but 2019 is not yet officially supported, we suggest to use 2017.
    And that's what I ended up doing.

    I only used msvc2019 in the first place, because MS makes ist unnecessarily difficult to download older compiler version!😡

    What msvc2019 feature is so important that you have to use that compiler ?

    gives error while compiling,

    what error?

    B Offline
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    BAHRAMUDIN ADIL
    wrote on last edited by
    #9

    @J-Hilk One problem I am getting while using Qt with MSVC 2019, my code not getting compiled:

    main.obj:-1: error: LNK2019: unresolved external symbol "__declspec(dllimport) public: __cdecl QSqlDatabase::~QSqlDatabase(void)" (__imp_??1QSqlDatabase@@QEAA@XZ) referenced in function main
    

    But same code works well with Qt + MSVC 2017.

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    • Christian EhrlicherC Offline
      Christian EhrlicherC Offline
      Christian Ehrlicher
      Lifetime Qt Champion
      wrote on last edited by
      #10

      @BAHRAMUDIN-ADIL said in Qt already updated to 5.14.1, but why it still uses MSVC 2017 build tools?:

      But same code works well with Qt + MSVC 2017.

      I doubt that - I would guess you don't link against the Qt sql library. Please show us your .pro file and/or make sure you're linking against the correct libraries you need.

      Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
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      B 1 Reply Last reply
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      • Christian EhrlicherC Christian Ehrlicher

        @BAHRAMUDIN-ADIL said in Qt already updated to 5.14.1, but why it still uses MSVC 2017 build tools?:

        But same code works well with Qt + MSVC 2017.

        I doubt that - I would guess you don't link against the Qt sql library. Please show us your .pro file and/or make sure you're linking against the correct libraries you need.

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        BAHRAMUDIN ADIL
        wrote on last edited by
        #11

        @Christian-Ehrlicher It is the .pro file content:

        QT -= gui
        
        CONFIG += c++11 console sql
        CONFIG -= app_bundle
        
        # The following define makes your compiler emit warnings if you use
        # any Qt feature that has been marked deprecated (the exact warnings
        # depend on your compiler). Please consult the documentation of the
        # deprecated API in order to know how to port your code away from it.
        DEFINES += QT_DEPRECATED_WARNINGS
        
        # You can also make your code fail to compile if it uses deprecated APIs.
        # In order to do so, uncomment the following line.
        # You can also select to disable deprecated APIs only up to a certain version of Qt.
        #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
        
        SOURCES += \
                main.cpp
        
        # Default rules for deployment.
        qnx: target.path = /tmp/$${TARGET}/bin
        else: unix:!android: target.path = /opt/$${TARGET}/bin
        !isEmpty(target.path): INSTALLS += target
        

        I have all the DLL and libs files in the Qt installed location bin/lib folder.

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        • S Offline
          S Offline
          SimonSchroeder
          wrote on last edited by
          #12

          According to the documentation (https://doc.qt.io/qt-5/qsqldatabase.html) you should add

          QT += sql
          

          to your .pro file. This tells the compiler to link with the SQL plugin.

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          • S SimonSchroeder

            According to the documentation (https://doc.qt.io/qt-5/qsqldatabase.html) you should add

            QT += sql
            

            to your .pro file. This tells the compiler to link with the SQL plugin.

            B Offline
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            BAHRAMUDIN ADIL
            wrote on last edited by BAHRAMUDIN ADIL
            #13

            @SimonSchroeder Thanks! I will try it.

            SGaistS 1 Reply Last reply
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            • B BAHRAMUDIN ADIL

              @SimonSchroeder Thanks! I will try it.

              SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by SGaist
              #14

              @BAHRAMUDIN-ADIL said in Qt already updated to 5.14.1, but why it still uses MSVC 2017 build tools?:

              @SimonSchroeder If you see carefully I have already added sql

              To the wrong variable. You added it to CONFIG but you shall add it to QT as @SimonSchroeder wrote.

              [edit: Answer to the original post SGaist]

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              • S SimonSchroeder

                According to the documentation (https://doc.qt.io/qt-5/qsqldatabase.html) you should add

                QT += sql
                

                to your .pro file. This tells the compiler to link with the SQL plugin.

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                BAHRAMUDIN ADIL
                wrote on last edited by
                #15

                @SimonSchroeder Yes, I did not add the SQL module correctly in .pro file. But now I got this error:

                QSqlDatabase: QMYSQL driver not loaded
                QSqlDatabase: available drivers: QSQLITE QODBC QODBC3 QPSQL QPSQL7
                
                J.HilkJ SGaistS 2 Replies Last reply
                0
                • SGaistS SGaist

                  @BAHRAMUDIN-ADIL said in Qt already updated to 5.14.1, but why it still uses MSVC 2017 build tools?:

                  @SimonSchroeder If you see carefully I have already added sql

                  To the wrong variable. You added it to CONFIG but you shall add it to QT as @SimonSchroeder wrote.

                  [edit: Answer to the original post SGaist]

                  B Offline
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                  BAHRAMUDIN ADIL
                  wrote on last edited by
                  #16

                  @SGaist Hmmm, yes, it was my fault, but now I got the next error, what is your opinion?
                  I have already added these two DLL files in Qt bin directory:

                  libmysqld.dll
                  libmysql.dll
                  

                  And also I have tried these three as well:

                  ssleay32.dll
                  libeay32.dll
                  libmysql.lib
                  

                  Also not solved the problem.

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                  • B BAHRAMUDIN ADIL

                    @SimonSchroeder Yes, I did not add the SQL module correctly in .pro file. But now I got this error:

                    QSqlDatabase: QMYSQL driver not loaded
                    QSqlDatabase: available drivers: QSQLITE QODBC QODBC3 QPSQL QPSQL7
                    
                    J.HilkJ Offline
                    J.HilkJ Offline
                    J.Hilk
                    Moderators
                    wrote on last edited by
                    #17

                    @BAHRAMUDIN-ADIL
                    after modifying your pro file, ALWAYS clean and run qmake

                    you added a new module so I would go a step further and delete the build directory for a complete rebuild


                    Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct


                    Q: What's that?
                    A: It's blue light.
                    Q: What does it do?
                    A: It turns blue.

                    B 1 Reply Last reply
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                    • J.HilkJ J.Hilk

                      @BAHRAMUDIN-ADIL
                      after modifying your pro file, ALWAYS clean and run qmake

                      you added a new module so I would go a step further and delete the build directory for a complete rebuild

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                      BAHRAMUDIN ADIL
                      wrote on last edited by
                      #18

                      @J-Hilk Yes, I did that as you said, but the problem still exists. Can you tell me what files and libs I need to add and add them in which place? Thanks!

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                      • B BAHRAMUDIN ADIL

                        @SimonSchroeder Yes, I did not add the SQL module correctly in .pro file. But now I got this error:

                        QSqlDatabase: QMYSQL driver not loaded
                        QSqlDatabase: available drivers: QSQLITE QODBC QODBC3 QPSQL QPSQL7
                        
                        SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #19

                        @BAHRAMUDIN-ADIL said in Qt already updated to 5.14.1, but why it still uses MSVC 2017 build tools?:

                        QSqlDatabase: QMYSQL driver not loaded
                        QSqlDatabase: available drivers: QSQLITE QODBC QODBC3 QPSQL QPSQL7

                        As you can see from the listing, you don't have the plugin at all.

                        As for why: the licensing of MySQL changed so only GPL and Commercial are available now. Since the pre-built binaries are usable also under the LGPL, the plugin can't be provided.

                        You also have the option of building it with MariaDB which fixes the licensing issue.

                        See QTBUG-78241

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

                        B 1 Reply Last reply
                        1
                        • SGaistS SGaist

                          @BAHRAMUDIN-ADIL said in Qt already updated to 5.14.1, but why it still uses MSVC 2017 build tools?:

                          QSqlDatabase: QMYSQL driver not loaded
                          QSqlDatabase: available drivers: QSQLITE QODBC QODBC3 QPSQL QPSQL7

                          As you can see from the listing, you don't have the plugin at all.

                          As for why: the licensing of MySQL changed so only GPL and Commercial are available now. Since the pre-built binaries are usable also under the LGPL, the plugin can't be provided.

                          You also have the option of building it with MariaDB which fixes the licensing issue.

                          See QTBUG-78241

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                          BAHRAMUDIN ADIL
                          wrote on last edited by
                          #20

                          @SGaist You mean that I need to build Qt from source with the needed plugins? Or I just need to build the MySQL plugin? If the second case is right, then to build the only plugin, what should I need, and how to build? Is there any guide to show how to build?
                          Thanks!

                          aha_1980A 1 Reply Last reply
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                          • B BAHRAMUDIN ADIL

                            @SGaist You mean that I need to build Qt from source with the needed plugins? Or I just need to build the MySQL plugin? If the second case is right, then to build the only plugin, what should I need, and how to build? Is there any guide to show how to build?
                            Thanks!

                            aha_1980A Offline
                            aha_1980A Offline
                            aha_1980
                            Lifetime Qt Champion
                            wrote on last edited by
                            #21

                            @BAHRAMUDIN-ADIL

                            you need to build the plugin as described here: https://doc.qt.io/qt-5/sql-driver.html#qmysql

                            Regards

                            Qt has to stay free or it will die.

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                            • aha_1980A aha_1980

                              @BAHRAMUDIN-ADIL

                              you need to build the plugin as described here: https://doc.qt.io/qt-5/sql-driver.html#qmysql

                              Regards

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                              BAHRAMUDIN ADIL
                              wrote on last edited by
                              #22

                              @aha_1980 Yes, before you send me the answer I saw this documentation, but can you tell me where is it?

                              cd %QTDIR%\qtbase\src\plugins\sqldrivers
                              

                              I did not find in whole Qt installation directory.

                              Thank you so much!!!

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                              • Christian EhrlicherC Offline
                                Christian EhrlicherC Offline
                                Christian Ehrlicher
                                Lifetime Qt Champion
                                wrote on last edited by
                                #23

                                @BAHRAMUDIN-ADIL said in Qt already updated to 5.14.1, but why it still uses MSVC 2017 build tools?:

                                I did not find in whole Qt installation directory.

                                As you can see there is 'src' - you need the Qt sources...

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

                                B 1 Reply Last reply
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                                • Christian EhrlicherC Christian Ehrlicher

                                  @BAHRAMUDIN-ADIL said in Qt already updated to 5.14.1, but why it still uses MSVC 2017 build tools?:

                                  I did not find in whole Qt installation directory.

                                  As you can see there is 'src' - you need the Qt sources...

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                                  BAHRAMUDIN ADIL
                                  wrote on last edited by
                                  #24

                                  @Christian-Ehrlicher Hmmm, so for a small plugin I need to download the whole Qt source code? It definitely takes a lot of time and takes much space. I think the Qt team should think about it to make it easy just to download only what I need not all the source code or provide some other way to overcome this problem because MySql users are very a lot on all over the world. If all the users download the source code it will so be extra pressure on Qt side server and also not good user experience.

                                  I hope the Qt becomes more beautiful in the feature!!

                                  aha_1980A 1 Reply Last reply
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                                  • B BAHRAMUDIN ADIL

                                    @Christian-Ehrlicher Hmmm, so for a small plugin I need to download the whole Qt source code? It definitely takes a lot of time and takes much space. I think the Qt team should think about it to make it easy just to download only what I need not all the source code or provide some other way to overcome this problem because MySql users are very a lot on all over the world. If all the users download the source code it will so be extra pressure on Qt side server and also not good user experience.

                                    I hope the Qt becomes more beautiful in the feature!!

                                    aha_1980A Offline
                                    aha_1980A Offline
                                    aha_1980
                                    Lifetime Qt Champion
                                    wrote on last edited by aha_1980
                                    #25

                                    @BAHRAMUDIN-ADIL You don't need to tell us - we are just users like you and not related to the Qt company.

                                    You might also want to use the MariaDB plugin which does not have the MySQL licence restrictions.

                                    Btw: you can download the sources with the MaintenanceTool.

                                    Regards

                                    Qt has to stay free or it will die.

                                    B 1 Reply Last reply
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                                    • aha_1980A aha_1980

                                      @BAHRAMUDIN-ADIL You don't need to tell us - we are just users like you and not related to the Qt company.

                                      You might also want to use the MariaDB plugin which does not have the MySQL licence restrictions.

                                      Btw: you can download the sources with the MaintenanceTool.

                                      Regards

                                      B Offline
                                      B Offline
                                      BAHRAMUDIN ADIL
                                      wrote on last edited by
                                      #26

                                      @aha_1980 What is the problem with the following output? I did everything step by step as the document, but why I am getting this error?
                                      Note: I am using MySql 8 and installed successfully and there is no problem with MySql server.

                                      C:\Qt\5.14.1\Src\qtbase\src\plugins\sqldrivers>qmake -- MYSQL_INCDIR="C:/Program Files/MySQL/MySQL Server 8.0/include" MYSQL_LIBDIR="C:/Program Files/MySQL/MySQL Server 8.0/lib"
                                      Info: creating stash file C:\Qt\5.14.1\Src\qtbase\src\plugins\sqldrivers\.qmake.stash
                                      
                                      Running configuration tests...
                                      Checking for DB2 (IBM)... no
                                      Checking for InterBase... no
                                      Checking for MySQL... no
                                      Checking for OCI (Oracle)... no
                                      Checking for ODBC... yes
                                      Checking for PostgreSQL... no
                                      Checking for SQLite (version 2)... no
                                      Checking for TDS (Sybase)... no
                                      Done running configuration tests.
                                      
                                      Configure summary:
                                      
                                      Qt Sql Drivers:
                                        DB2 (IBM) .............................. no
                                        InterBase .............................. no
                                        MySql .................................. no
                                        OCI (Oracle) ........................... no
                                        ODBC ................................... yes
                                        PostgreSQL ............................. no
                                        SQLite2 ................................ no
                                        SQLite ................................. yes
                                          Using system provided SQLite ......... no
                                        TDS (Sybase) ........................... no
                                      
                                      Qt is now configured for building. Just run 'nmake'.
                                      Once everything is built, you must run 'nmake install'.
                                      Qt will be installed into 'C:\Qt\5.14.0\msvc2017_64'.
                                      
                                      Prior to reconfiguration, make sure you remove any leftovers from
                                      the previous build.
                                      
                                      
                                      C:\Qt\5.14.1\Src\qtbase\src\plugins\sqldrivers>nmake sub-mysql
                                      
                                      Microsoft (R) Program Maintenance Utility Version 14.24.28316.0
                                      Copyright (C) Microsoft Corporation.  All rights reserved.
                                      
                                      NMAKE : fatal error U1073: don't know how to make 'sub-mysql'
                                      Stop.
                                      
                                      C:\Qt\5.14.1\Src\qtbase\src\plugins\sqldrivers>
                                      
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                                      • SGaistS Offline
                                        SGaistS Offline
                                        SGaist
                                        Lifetime Qt Champion
                                        wrote on last edited by
                                        #27

                                        Take a closer look at the configure test logs to see exactly why the detection failed.

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                                        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                                        B 1 Reply Last reply
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                                        • SGaistS SGaist

                                          Take a closer look at the configure test logs to see exactly why the detection failed.

                                          B Offline
                                          B Offline
                                          BAHRAMUDIN ADIL
                                          wrote on last edited by
                                          #28

                                          @SGaist Still it is throwing error, I going to not use Qt anymore, and go for Java, the best and the easy language all over the word it is why Java is always on the top of all of the languages.

                                          1 Reply Last reply
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