Qt already updated to 5.14.1, but why it still uses MSVC 2017 build tools?
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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?
@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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@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 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.
@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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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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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.
@SimonSchroeder Thanks! I will try it.
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@SimonSchroeder Thanks! I will try it.
@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 toQT
as @SimonSchroeder wrote.[edit: Answer to the original post SGaist]
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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.
@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
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@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 toQT
as @SimonSchroeder wrote.[edit: Answer to the original post SGaist]
@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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@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
@BAHRAMUDIN-ADIL
after modifying your pro file, ALWAYS clean and run qmakeyou 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
after modifying your pro file, ALWAYS clean and run qmakeyou added a new module so I would go a step further and delete the build directory for a complete rebuild
@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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@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
@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 QPSQL7As 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 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 QPSQL7As 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
@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! -
@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!you need to build the plugin as described here: https://doc.qt.io/qt-5/sql-driver.html#qmysql
Regards
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you need to build the plugin as described here: https://doc.qt.io/qt-5/sql-driver.html#qmysql
Regards
@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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@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 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...
@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!!
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@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!!
@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
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@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
@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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Take a closer look at the configure test logs to see exactly why the detection failed.
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@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.