4. Simplest way to install Qt in Ubuntu (19.10) with MySQL driver?

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Simplest way to install Qt in Ubuntu (19.10) with MySQL driver?


  • Hello,
    can someone explain to me the simplest possible way to complete the installation with MySQL driver in Ubuntu?

    I installed and used Qt a few months ago and now, probably because of some system update, I am getting

    QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers: QSQLITE QMYSQL QMYSQL3 QODBC QODBC3 QPSQL QPSQL7

    Since it took me a lot of time back then to fix the same problem, I am searching for the simplest painless way to get everything working in Ubuntu without spending days trying every solution listed in this forum. Last time it was really exhausting!

    Thanks in advance

    0 1 Reply

  • @enne9
    Have you installed libqt5sql5-mysql, https://packages.ubuntu.com/disco/libqt5sql5-mysql ? (Do through apt-get.)

    Otherwise if it used to work and has stopped, you could ldd the library .so files, and from docs

    To obtain diagnostic information from Qt, about each plugin it tries to load, use the QT_DEBUG_PLUGINS environment variable. Set this variable to a non-zero value in the environment where your application is launched.

    2 1 Reply

  • @JonB I have reinstalled everything starting from the offline installer (https://www.qt.io/offline-installers). What are the next steps? I tried installing libqt5sql5-mysql but it is not solving the problem. Any suggestion? I noticed also that now it is not even proposing QMYSQL:

    QSqlDatabase: available drivers: QSQLITE QODBC QODBC3 QPSQL QPSQL7
    0 2 Replies

  • @enne9
    Do the QT_DEBUG_PLUGINS as per previous post.

    0 1 Reply
  • Lifetime Qt Champion

    @enne9 As far as I know you need to build MySQL plug-in by yourself (because of legal reasons).
    Install the libmysql-dev package and check https://doc.qt.io/qt-5/sql-driver.html for instructions how to build.

    2 2 Replies

  • @JonB said in Simplest way to install Qt in Ubuntu (19.10) with MySQL driver?:

    QT_DEBUG_PLUGINS

    I used it, but I am a beginner and I don't know what to search for. This is the output:

    QFactoryLoader::QFactoryLoader() checking directory path "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqeglfs.so"
Found metadata in lib /home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqeglfs.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "eglfs"
        ]
    },
    "archreq": 0,
    "className": "QEglFSIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("eglfs")
QFactoryLoader::QFactoryLoader() looking at "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqlinuxfb.so"
Found metadata in lib /home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqlinuxfb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "linuxfb"
        ]
    },
    "archreq": 0,
    "className": "QLinuxFbIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("linuxfb")
QFactoryLoader::QFactoryLoader() looking at "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqminimal.so"
Found metadata in lib /home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqminimal.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "archreq": 0,
    "className": "QMinimalIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqminimalegl.so"
Found metadata in lib /home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqminimalegl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimalegl"
        ]
    },
    "archreq": 0,
    "className": "QMinimalEglIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("minimalegl")
QFactoryLoader::QFactoryLoader() looking at "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqoffscreen.so"
Found metadata in lib /home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqoffscreen.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "offscreen"
        ]
    },
    "archreq": 0,
    "className": "QOffscreenIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqvnc.so"
Found metadata in lib /home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqvnc.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "vnc"
        ]
    },
    "archreq": 0,
    "className": "QVncIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("vnc")
QFactoryLoader::QFactoryLoader() looking at "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqwayland-egl.so"
Found metadata in lib /home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqwayland-egl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "wayland-egl"
        ]
    },
    "archreq": 0,
    "className": "QWaylandEglPlatformIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("wayland-egl")
QFactoryLoader::QFactoryLoader() looking at "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqwayland-generic.so"
Found metadata in lib /home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqwayland-generic.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "wayland"
        ]
    },
    "archreq": 0,
    "className": "QWaylandIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("wayland")
QFactoryLoader::QFactoryLoader() looking at "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqwayland-xcomposite-egl.so"
Found metadata in lib /home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqwayland-xcomposite-egl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "wayland-xcomposite-egl"
        ]
    },
    "archreq": 0,
    "className": "QWaylandXCompositeEglPlatformIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("wayland-xcomposite-egl")
QFactoryLoader::QFactoryLoader() looking at "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqwayland-xcomposite-glx.so"
Found metadata in lib /home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqwayland-xcomposite-glx.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "wayland-xcomposite-glx"
        ]
    },
    "archreq": 0,
    "className": "QWaylandXCompositeGlxPlatformIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("wayland-xcomposite-glx")
QFactoryLoader::QFactoryLoader() looking at "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqwebgl.so"
Found metadata in lib /home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqwebgl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "webgl"
        ]
    },
    "archreq": 0,
    "className": "QWebGLIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("webgl")
QFactoryLoader::QFactoryLoader() looking at "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqxcb.so"
Found metadata in lib /home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqxcb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "xcb"
        ]
    },
    "archreq": 0,
    "className": "QXcbIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("xcb")
QFactoryLoader::QFactoryLoader() checking directory path "/home/enrico/Desktop/Documenti/PDS_project/build-SharedEditor-Desktop_Qt_5_14_1_GCC_64bit-Debug/Server/platforms" ...
loaded library "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqxcb.so"
loaded library "Xcursor"
QFactoryLoader::QFactoryLoader() checking directory path "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platformthemes" ...
QFactoryLoader::QFactoryLoader() looking at "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platformthemes/libqgtk3.so"
Found metadata in lib /home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platformthemes/libqgtk3.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformThemeFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "gtk3"
        ]
    },
    "archreq": 0,
    "className": "QGtk3ThemePlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("gtk3")
QFactoryLoader::QFactoryLoader() looking at "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platformthemes/libqxdgdesktopportal.so"
Found metadata in lib /home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platformthemes/libqxdgdesktopportal.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformThemeFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "xdgdesktopportal",
            "flatpak",
            "snap"
        ]
    },
    "archreq": 0,
    "className": "QXdgDesktopPortalThemePlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("xdgdesktopportal", "flatpak", "snap")
QFactoryLoader::QFactoryLoader() checking directory path "/home/enrico/Desktop/Documenti/PDS_project/build-SharedEditor-Desktop_Qt_5_14_1_GCC_64bit-Debug/Server/platformthemes" ...
loaded library "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platformthemes/libqgtk3.so"
QFactoryLoader::QFactoryLoader() checking directory path "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforminputcontexts" ...
QFactoryLoader::QFactoryLoader() looking at "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so"
Found metadata in lib /home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QPlatformInputContextFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "compose",
            "xim"
        ]
    },
    "archreq": 0,
    "className": "QComposePlatformInputContextPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("compose", "xim")
QFactoryLoader::QFactoryLoader() looking at "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforminputcontexts/libibusplatforminputcontextplugin.so"
Found metadata in lib /home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforminputcontexts/libibusplatforminputcontextplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QPlatformInputContextFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "ibus"
        ]
    },
    "archreq": 0,
    "className": "QIbusPlatformInputContextPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("ibus")
QFactoryLoader::QFactoryLoader() looking at "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforminputcontexts/libqtvirtualkeyboardplugin.so"
Found metadata in lib /home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforminputcontexts/libqtvirtualkeyboardplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QPlatformInputContextFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "qtvirtualkeyboard"
        ]
    },
    "archreq": 0,
    "className": "QVirtualKeyboardPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("qtvirtualkeyboard")
QFactoryLoader::QFactoryLoader() checking directory path "/home/enrico/Desktop/Documenti/PDS_project/build-SharedEditor-Desktop_Qt_5_14_1_GCC_64bit-Debug/Server/platforminputcontexts" ...
loaded library "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforminputcontexts/libibusplatforminputcontextplugin.so"
QFactoryLoader::QFactoryLoader() checking directory path "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/styles" ...
QFactoryLoader::QFactoryLoader() checking directory path "/home/enrico/Desktop/Documenti/PDS_project/build-SharedEditor-Desktop_Qt_5_14_1_GCC_64bit-Debug/Server/styles" ...
QFactoryLoader::QFactoryLoader() checking directory path "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/sqldrivers" ...
QFactoryLoader::QFactoryLoader() looking at "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/sqldrivers/libqsqlite.so"
Found metadata in lib /home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/sqldrivers/libqsqlite.so, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QSQLITE"
        ]
    },
    "archreq": 0,
    "className": "QSQLiteDriverPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("QSQLITE")
QFactoryLoader::QFactoryLoader() looking at "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/sqldrivers/libqsqlodbc.so"
Found metadata in lib /home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/sqldrivers/libqsqlodbc.so, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QODBC3",
            "QODBC"
        ]
    },
    "archreq": 0,
    "className": "QODBCDriverPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("QODBC3", "QODBC")
QFactoryLoader::QFactoryLoader() looking at "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/sqldrivers/libqsqlpsql.so"
Found metadata in lib /home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/sqldrivers/libqsqlpsql.so, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QPSQL7",
            "QPSQL"
        ]
    },
    "archreq": 0,
    "className": "QPSQLDriverPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("QPSQL7", "QPSQL")
QFactoryLoader::QFactoryLoader() checking directory path "/home/enrico/Desktop/Documenti/PDS_project/build-SharedEditor-Desktop_Qt_5_14_1_GCC_64bit-Debug/Server/sqldrivers" ...
QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers: QSQLITE QODBC QODBC3 QPSQL QPSQL7
Numero di thread:  8 

QFactoryLoader::QFactoryLoader() checking directory path "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/xcbglintegrations" ...
QFactoryLoader::QFactoryLoader() looking at "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/xcbglintegrations/libqxcb-egl-integration.so"
Found metadata in lib /home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/xcbglintegrations/libqxcb-egl-integration.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.Xcb.QXcbGlIntegrationFactoryInterface.5.5",
    "MetaData": {
        "Keys": [
            "xcb_egl"
        ]
    },
    "archreq": 0,
    "className": "QXcbEglIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("xcb_egl")
QFactoryLoader::QFactoryLoader() looking at "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/xcbglintegrations/libqxcb-glx-integration.so"
Found metadata in lib /home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/xcbglintegrations/libqxcb-glx-integration.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.Xcb.QXcbGlIntegrationFactoryInterface.5.5",
    "MetaData": {
        "Keys": [
            "xcb_glx"
        ]
    },
    "archreq": 0,
    "className": "QXcbGlxIntegrationPlugin",
    "debug": false,
    "version": 331264
}


Got keys from plugin meta data ("xcb_glx")
QFactoryLoader::QFactoryLoader() checking directory path "/home/enrico/Desktop/Documenti/PDS_project/build-SharedEditor-Desktop_Qt_5_14_1_GCC_64bit-Debug/Server/xcbglintegrations" ...
loaded library "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/xcbglintegrations/libqxcb-glx-integration.so"
QFactoryLoader::QFactoryLoader() checking directory path "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/accessible" ...
QFactoryLoader::QFactoryLoader() checking directory path "/home/enrico/Desktop/Documenti/PDS_project/build-SharedEditor-Desktop_Qt_5_14_1_GCC_64bit-Debug/Server/accessible" ...
Test
QFactoryLoader::QFactoryLoader() checking directory path "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/accessiblebridge" ...
QFactoryLoader::QFactoryLoader() checking directory path "/home/enrico/Desktop/Documenti/PDS_project/build-SharedEditor-Desktop_Qt_5_14_1_GCC_64bit-Debug/Server/accessiblebridge" ...
QLibraryPrivate::unload succeeded on "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/xcbglintegrations/libqxcb-glx-integration.so" 
QLibraryPrivate::unload succeeded on "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforminputcontexts/libibusplatforminputcontextplugin.so" 
QLibraryPrivate::unload succeeded on "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platformthemes/libqgtk3.so" 
QLibraryPrivate::unload succeeded on "/home/enrico/Qt5.14.1/5.14.1/gcc_64/plugins/platforms/libqxcb.so" 
QLibraryPrivate::unload succeeded on "Xcursor" (faked)
    0

  • @jsulm This is part of the output when I just run ./configure. Why is there no "yes" near "MySql"?
    configure.png

    If I run ./configure -sql-mysql it shows
    ERROR: Feature 'sql-mysql' was enabled, but the pre-condition 'libs.mysql' failed.
    What am I doing wrong?

    I also noted that there was already a file /usr/lib/x86_64-linux-gnu/qt5/plugins/sqldrivers/libqsqlmysql.so and I copied it in ~/Qt5.14.1/5.14.1/gcc_64/plugins/sqldrivers but it says:
    Cannot mix incompatible Qt library (version 0x50c04) with this library (version 0x50e01)
    How can I get the compatible version?

    0

  • @jsulm any suggestion?

    0 1 Reply
  • Lifetime Qt Champion

    @enne9 Please check the configure log and read once more what I wrote before: "Install the libmysql-dev package".
    And please do not push for answers - people here are volunteers spending their own time to help...

    1 1 Reply

  • @jsulm there is no libmysql-dev package, I instead installed libmysqlclient-dev.
    The error I am getting is still

    ERROR: Feature 'sql-mysql' was enabled, but the pre-condition 'libs.mysql' failed.

    Sorry, I wasn't pushing and I am sorry if it seemed so.

    0 1 Reply
  • Lifetime Qt Champion

    Did you re-run configure from a clean state ? If not, as suggested in the summary, you should clean the sources if you called configure it.

    Better yet, do an out of source build so that you can just nuke the build folder to restart fresh.

    If it is still failing, then check the test logs to see exactly why the detection failed.

    2 1 Reply
  • Lifetime Qt Champion

    @enne9 said in Simplest way to install Qt in Ubuntu (19.10) with MySQL driver?:

    libmysqlclient-dev

    This one should be the correct one.
    Did you check config.log to see whether there are more specific errors regarding MySQL plug-in?

    0

  • @jsulm said in Simplest way to install Qt in Ubuntu (19.10) with MySQL driver?:

    @enne9 As far as I know you need to build MySQL plug-in by yourself (because of legal reasons).
    Install the libmysql-dev package and check https://doc.qt.io/qt-5/sql-driver.html for instructions how to build.

    Just for clarification: I have used Qt & MySQL up to Ubuntu 19.04. I have only ever had to use apt-get for packages, I have never had to compile/build/configure Qt or anything MySQL. Did the change requiring needing to build MySQL plug-in come in at 19.10?

    0 1 Reply
  • Lifetime Qt Champion

    @JonB Did you use Qt provided by the distribution?

    0 1 Reply

  • @SGaist Thanks, I uninstalled everything using the maintenance tool and then reinstalled again using, as usual, the offline installer.
    I run ./configure -sql-mysql as first command and finally there was "yes" near "MySql" and the process ended well.

    In the previous attempt I had already run ./configure before ./configure -sql-mysql without cleaning, was that the problem in your opinion?

    0 1 Reply

  • @jsulm said in Simplest way to install Qt in Ubuntu (19.10) with MySQL driver?:

    @JonB Did you use Qt provided by the distribution?

    Yes, absolutely, the Qt 5.12.2 which came with Ubuntu 19.04 was adequate for me. I didn't see anything in OP's question which said he had built Qt for himself. Given that, I have never had to build/configure Qt, any the libraries to hook Qt to MySQL also come from apt-get. Hence why I was asking whether that will have changed at 19.10? Because if so I shall not be moving off 19.04 till I have to, hence my question....

    0 1 Reply
  • Lifetime Qt Champion

    @enne9 said in Simplest way to install Qt in Ubuntu (19.10) with MySQL driver?:

    In the previous attempt I had already run ./configure before ./configure -sql-mysql without cleaning, was that the problem in your opinion?

    Yes, as suggested in the summary message, if you changed something like adding a new dependency library and re-run configure, you have to clean before calling configure again.

    But as I already wrote, out of source builds are way simpler to handle that kind use case. You keep the sources clean and can nuke easily the faulty build/configure to start anew.

    2
  • Lifetime Qt Champion

    @JonB said in Simplest way to install Qt in Ubuntu (19.10) with MySQL driver?:

    he had built Qt for himself

    It applies to Qt installed via installer as well

    0 1 Reply

  • @jsulm

    It applies to Qt installed via installer as well

    Hmm, I've never done that. Only ever apt-get. I hope I'm not hijacking (tell me if I am), but let's put it this way: if I move to a newer Ubuntu, and I want the Qt and the libqtmysql stuff as supplied with distro via apt-get, can I still do that (absolutely no compiling/building/configuring of either), or at 19.10+ has something been removed which means it won't work any longer?

    0 1 Reply
  • Lifetime Qt Champion

    @JonB said in Simplest way to install Qt in Ubuntu (19.10) with MySQL driver?:

    can I still do that

    Yes, the prebuild Qt provided by Ubuntu should have everything you need (but I did not yet use any of 19.x Ubuntu).

    2 1 Reply

  • @jsulm
    That's great. Then at least the OP knows that if he is happy with the Qt version in the 19.10 distro has has the option of doing it all with no compiling etc. Having said that, his latest may imply he is now progressing OK with what he has, which is equally fine.

    0

  • The make compilation completed successfully but make install terminates with the error

    g++: error: /home/enrico/Qt5.14.1/5.14.1/Src/qtvirtualkeyboard/lib/libqtopenwnn.a: No such file or directory

    Any idea?

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  • I have just noticed that I have used make instead of qmake. Is that the problem?

    Should I repeat the whole process using qmake and, if this is the case, should I clean run a make clean before?
    Thanks

    An update: now the error is

    Error copying ../../../lib/libQt5Bootstrap.a to /usr/local/Qt-5.14.1/lib/libQt5Bootstrap.a: Destination file exists
    0 1 Reply
  • Lifetime Qt Champion

    @enne9 Did you run qmake before make?
    The sequence is:

    • qmake
    • make
    • make install
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  • I used

    ./configure -sql-mysql
make
make install

    How can I proceed now? Do I need to clean (using which commands?) and do the operations in the order you listed?

    0 1 Reply
  • Lifetime Qt Champion

    @enne9 As @SGaist already suggested do out of source builds, this way you will have less troubles.
    Use "make clean" to clean up.

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  • Isn't qmake included in ./configure -sql-mysql? I just run it and the output is the same.

    0
  • Lifetime Qt Champion

    It's the first thing that gets built however, you are currently making things more complicated than necessary. You should just build the plugin using your already installed Qt rather than the full thing.

    1
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