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Qt compile from source problem for xcb in ubuntu 18



  • Hi,

    When I install Qt from the site offical installer all is fine for xcb plugin. But I need to compile from source for mysql plugin availability
    ( I assume , is there any way to use mysql from offical download? )

    When I compile same Qt version from the source Qt5.12.1 from https://download.qt.io/archive/qt/5.12/5.12.1/single/ I cant use the xcb and cant see app neither is working?

    What should I do ? The error:

    qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in ""
    This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
    
    Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, webgl.
    
    Aborted (core dumped)
    

  • Lifetime Qt Champion

    Hi,

    The xcb backend wasn't built, you are likely missing a dependency. You should check the tests log.

    I'd say libxkb dev package is missing.


  • Lifetime Qt Champion

    @RahibeMeryem I encountered the same problem recently with my developer build on a new Ubuntu 18.04 machine.

    I checked the config summary, and now installed:

    sudo apt install libxi-dev libxcomposite-dev libxcursor-dev libxtst-dev 
    

    configure is happy now, let's see what happens when the build succeeds.

    Regards


  • Lifetime Qt Champion

    Unfortunately it didn't help :(

    @SGaist, any idea what I could be missing?

    Running configuration tests...
    Checking for machine tuple... yes
    Checking for valid makespec... yes
    Checking for target architecture... x86_64
    Checking for SSE2 instructions... yes
    Checking for AES new instructions... yes
    Checking for alloca() in alloca.h... yes
    Checking for SSE3 instructions... yes
    Checking for SSSE3 instructions... yes
    Checking for SSE4.1 instructions... yes
    Checking for SSE4.2 instructions... yes
    Checking for AVX instructions... yes
    Checking for AVX2 instructions... yes
    Checking for AVX512 F instructions... yes
    Checking for AVX512 BW instructions... yes
    Checking for AVX512 CD instructions... yes
    Checking for AVX512 DQ instructions... yes
    Checking for AVX512 ER instructions... yes
    Checking for AVX512 IFMA instructions... yes
    Checking for AVX512 PF instructions... yes
    Checking for AVX512 VBMI instructions... yes
    Checking for AVX512 VL instructions... yes
    Checking for C++14 support... yes
    Checking for C++1z support... yes
    Checking for C99 support... yes
    Checking for C11 support... yes
    Checking for pkg-config... yes
    Checking for D-Bus >= 1.2... yes
    Checking for gdb index support... no
    Checking for new dtags support... yes
    Checking for F16C instructions... yes
    Checking for D-Bus >= 1.2 (host)... yes
    Checking for udev... yes
    Checking for -Og support... yes
    Checking for POSIX fallocate()... yes
    Checking for precompiled header support... yes
    Checking for RDRAND instruction... yes
    Checking for symbol visibility support... yes
    Checking for -Bsymbolic-functions support... yes
    Checking for SHA new instructions... yes
    Checking for STL compatibility... yes
    Checking for zlib... yes
    Checking for Intrinsics without -mXXX argument... yes
    Checking for Zstandard... no
    Checking for clock_gettime()... yes
    Checking for POSIX monotonic clock... yes
    Checking for C++11 <future>... yes
    Checking for dlopen()... yes
    Checking for eventfd... yes
    Checking for futimens()... yes
    Checking for getauxval()... yes
    Checking for getentropy()... yes
    Checking for GLib... yes
    Checking for POSIX iconv... yes
    Checking for ICU... yes
    Checking for inotify... yes
    Checking for SysV IPC... yes
    Checking for linkat()... yes
    Checking for ppoll()... yes
    Checking for renameat2()... no
    Checking for slog2... no
    Checking for statx() in libc... no
    Checking for 64 bit atomics... yes
    Checking for DoubleConversion... no
    Checking for PCRE2... no
    Checking for O_CLOEXEC... yes
    Checking for C++11 <random>... yes
    Checking for working std::atomic for function pointers... yes
    Checking for OpenSSL Headers... yes
    Checking for DTLS support in OpenSSL... yes
    Checking for getifaddrs()... yes
    Checking for IPv6 ifname... yes
    Checking for Linux AF_NETLINK sockets... yes
    Checking for OpenSSL 1.1 support... yes
    Checking for OCSP stapling support in OpenSSL... yes
    Checking for xkbcommon >= 0.5.0... no
    Checking for Desktop OpenGL... yes
    Checking for KMS... yes
    Checking for DRM Atomic API... yes
    Checking for EGL... no
    Checking for evdev... yes
    Checking for FreeType... yes
    Checking for Fontconfig... yes
    Checking for GBM... no
    Checking for libinput... no
    Checking for LinuxFB... yes
    Checking for mtdev... no
    Checking for OpenVG... no
    Checking for default QPA platform... xcb
    Checking for HarfBuzz... yes
    Checking for libjpeg... yes
    Checking for libpng... yes
    Checking for tslib... no
    Checking for Vulkan... no
    Checking for XLib... yes
    Checking for XCB >= 1.9... yes
    Checking for XCB Xlib... yes
    Checking for GTK+ >= 3.6... no
    Checking for CUPS... yes
    Checking for DB2 (IBM)... no
    Checking for InterBase... no
    Checking for MySQL... no
    Checking for OCI (Oracle)... no
    Checking for ODBC... no
    Checking for PostgreSQL... no
    Checking for SQLite (version 2)... no
    Checking for TDS (Sybase)... no
    Checking for Socket CAN... yes
    Checking for Socket CAN FD... yes
    Checking for Direct3D 12... no
    Checking for SDL2... no
    Checking for Assimp... no
    Checking for Autodesk FBX... no
    Checking for Wayland client library... no
    Checking for Wayland EGL library... no
    Checking for wayland-server... no
    Checking for BlueZ... no
    Checking for sensorfw... no
    Checking for Gypsy... no
    Checking for WinRT Geolocation API... no
    Checking for ALSA... no
    Checking for GStreamer 1.0... no
    Checking for GStreamer 0.10... no
    Checking for Video for Linux... yes
    Checking for OpenAL... no
    Checking for PulseAudio >= 0.9.10... no
    Checking for libresourceqt5... no
    Checking for libclang... no
    Checking for alsa... no
    Checking for embedded... no
    Checking for bison... no
    Checking for GCC 6 or newer... yes
    Checking for flex... no
    Checking for gperf... no
    Checking for host pkg-config... /usr/bin/pkg-config
    Checking for poppler-cpp... no
    Checking for pulseaudio >= 0.9.10... no
    Checking for python2... /usr/bin/python2
    Checking for d-bus... yes
    Checking for fontconfig... yes
    Checking for freetype >= 2.4.2... yes
    Checking for glib-2.0 >= 2.32.0... yes
    Checking for glibc > 2.16... yes
    Checking for harfbuzz >= 2.0.0... no
    Checking for compatible jpeglib... yes
    Checking for jsoncpp... no
    Checking for khr... no
    Checking for lcms2... yes
    Checking for libdrm... yes
    Checking for libevent... no
    Checking for libvpx... no
    Checking for libwebp, libwebpmux and libwebpdemux... no
    Checking for libxml2 and libxslt... no
    Checking for minizip... no
    Checking for system ninja... no
    Checking for nss >= 3.26... no
    Checking for opus... no
    Checking for libpng >= 1.6.0... yes
    Checking for protobuf... no
    Checking for re2... no
    Checking for snappy... no
    Checking for x11... yes
    Checking for xcomposite... yes
    Checking for xcursor... yes
    Checking for xi... yes
    Checking for xtst... yes
    Checking for zlib... yes
    Done running configuration tests.
    
    Configure summary:
    
    Build type: linux-g++ (x86_64, CPU features: mmx sse sse2)
    Compiler: gcc 7.3.0
    Configuration: sse2 aesni sse3 ssse3 sse4_1 sse4_2 avx avx2 avx512f avx512bw avx512cd avx512dq avx512er avx512ifma avx512pf avx512vbmi avx512vl compile_examples enable_new_dtags f16c headersclean largefile optimize_debug precompile_header rdrnd shani warnings_are_errors x86SimdAlways private_tests shared rpath debug c++11 c++14 c++1z concurrent dbus reduce_exports reduce_relocations release_tools stl
    Build options:
      Mode ................................... debug; optimized tools
      Optimize debug build ................... yes
      Building shared libraries .............. yes
      Using C standard ....................... C11
      Using C++ standard ..................... C++1z
      Using ccache ........................... no
      Using new DTAGS ........................ yes
      Generating GDB index ................... no
      Using precompiled headers .............. yes
      Using LTCG ............................. no
      Target compiler supports:
        SSE .................................. SSE2 SSE3 SSSE3 SSE4.1 SSE4.2
        AVX .................................. AVX AVX2
        AVX512 ............................... F ER CD PF DQ BW VL IFMA VBMI
        Other x86 ............................ AES F16C RDRAND SHA
        Intrinsics without -mXXX option ...... yes
      Build parts ............................ libs tools
    Qt modules and options:
      Qt Concurrent .......................... yes
      Qt D-Bus ............................... yes
      Qt D-Bus directly linked to libdbus .... yes
      Qt Gui ................................. yes
      Qt Network ............................. yes
      Qt Sql ................................. yes
      Qt Testlib ............................. yes
      Qt Widgets ............................. yes
      Qt Xml ................................. yes
    Support enabled for:
      Using pkg-config ....................... yes
      udev ................................... yes
      Using system zlib ...................... yes
      Zstandard support ...................... no
    Qt Core:
      DoubleConversion ....................... yes
        Using system DoubleConversion ........ no
      GLib ................................... yes
      iconv .................................. no
      ICU .................................... yes
      Tracing backend ........................ <none>
      Logging backends:
        journald ............................. no
        syslog ............................... no
        slog2 ................................ no
      Using system PCRE2 ..................... no
    Qt Network:
      getifaddrs() ........................... yes
      IPv6 ifname ............................ yes
      libproxy ............................... no
      Linux AF_NETLINK ....................... yes
      OpenSSL ................................ yes
        Qt directly linked to OpenSSL ........ no
      OpenSSL 1.1 ............................ yes
      DTLS ................................... yes
      OCSP-stapling .......................... yes
      SCTP ................................... no
      Use system proxies ..................... yes
    Qt Gui:
      Accessibility .......................... yes
      FreeType ............................... yes
        Using system FreeType ................ yes
      HarfBuzz ............................... yes
        Using system HarfBuzz ................ yes
      Fontconfig ............................. yes
      Image formats:
        GIF .................................. yes
        ICO .................................. yes
        JPEG ................................. yes
          Using system libjpeg ............... yes
        PNG .................................. yes
          Using system libpng ................ yes
      EGL .................................... no
      OpenVG ................................. no
      OpenGL:
        Desktop OpenGL ....................... yes
        OpenGL ES 2.0 ........................ no
        OpenGL ES 3.0 ........................ no
        OpenGL ES 3.1 ........................ no
        OpenGL ES 3.2 ........................ no
      Vulkan ................................. no
      Session Management ..................... yes
    Features used by QPA backends:
      evdev .................................. yes
      libinput ............................... no
      INTEGRITY HID .......................... no
      mtdev .................................. no
      tslib .................................. no
      xkbcommon .............................. no
      X11 specific:
        XLib ................................. yes
        XCB Xlib ............................. yes
        EGL on X11 ........................... no
    QPA backends:
      DirectFB ............................... no
      EGLFS .................................. no
      LinuxFB ................................ yes
      VNC .................................... yes
      Mir client ............................. no
    Qt Sql:
      SQL item models ........................ yes
    Qt Widgets:
      GTK+ ................................... no
      Styles ................................. Fusion Windows
    Qt PrintSupport:
      CUPS ................................... yes
    Qt Sql Drivers:
      DB2 (IBM) .............................. no
      InterBase .............................. no
      MySql .................................. no
      OCI (Oracle) ........................... no
      ODBC ................................... no
      PostgreSQL ............................. no
      SQLite2 ................................ no
      SQLite ................................. yes
        Using system provided SQLite ......... no
      TDS (Sybase) ........................... no
    Qt Testlib:
      Tester for item models ................. yes
    Qt SerialBus:
      Socket CAN ............................. yes
      Socket CAN FD .......................... yes
      SerialPort Support ..................... yes
    Qt QML:
      QML network support .................... yes
      QML debugging and profiling support .... yes
      QML tracing JIT support ................ no
      QML sequence object .................... yes
      QML list model ......................... yes
      QML XML http request ................... yes
      QML Locale ............................. yes
      QML delegate model ..................... yes
    Qt Quick:
      Direct3D 12 ............................ no
      AnimatedImage item ..................... yes
      Canvas item ............................ yes
      Support for Qt Quick Designer .......... yes
      Flipable item .......................... yes
      GridView item .......................... yes
      ListView item .......................... yes
      TableView item ......................... yes
      Path support ........................... yes
      PathView item .......................... yes
      Positioner items ....................... yes
      Repeater item .......................... yes
      ShaderEffect item ...................... yes
      Sprite item ............................ yes
    Qt Scxml:
      ECMAScript data model for QtScxml ...... yes
    Qt Gamepad:
      SDL2 ................................... no
    Qt 3D:
      Assimp ................................. yes
      System Assimp .......................... no
      Output Qt3D Job traces ................. no
      Output Qt3D GL traces .................. no
      Use SSE2 instructions .................. yes
      Use AVX2 instructions .................. no
      Aspects:
        Render aspect ........................ yes
        Input aspect ......................... yes
        Logic aspect ......................... yes
        Animation aspect ..................... yes
        Extras aspect ........................ yes
    Qt 3D Renderers:
      OpenGL Renderer ........................ yes
    Qt 3D GeometryLoaders:
      Autodesk FBX ........................... no
    Qt Wayland Client ........................ no
    Qt Wayland Compositor .................... no
    Qt Bluetooth:
      BlueZ .................................. no
      BlueZ Low Energy ....................... no
      Linux Crypto API ....................... no
      WinRT Bluetooth API (desktop & UWP) .... no
      WinRT advanced bluetooth low energy API (desktop & UWP) . no
    Qt Sensors:
      sensorfw ............................... no
    Qt Quick Controls 2:
      Styles ................................. Default Fusion Imagine Material Universal
    Qt Quick Templates 2:
      Hover support .......................... yes
      Multi-touch support .................... yes
    Qt Positioning:
      Gypsy GPS Daemon ....................... no
      WinRT Geolocation API .................. no
    Qt Location:
      Qt.labs.location experimental QML plugin . yes
      Geoservice plugins:
        OpenStreetMap ........................ yes
        HERE ................................. yes
        Esri ................................. yes
        Mapbox ............................... yes
        MapboxGL ............................. yes
        Itemsoverlay ......................... yes
    QtXmlPatterns:
      XML schema support ..................... yes
    Qt Multimedia:
      ALSA ................................... no
      GStreamer 1.0 .......................... no
      GStreamer 0.10 ......................... no
      Video for Linux ........................ yes
      OpenAL ................................. no
      PulseAudio ............................. no
      Resource Policy (libresourceqt5) ....... no
      Windows Audio Services ................. no
      DirectShow ............................. no
      Windows Media Foundation ............... no
    Qt Tools:
      QDoc ................................... no
    Qt WebEngineCore:
      Qt WebEngine Widgets ................... yes
      Qt WebEngine Qml ....................... yes
      Embedded build ......................... no
      Pepper Plugins ......................... yes
      Printing and PDF ....................... yes
      Proprietary Codecs ..................... no
      Spellchecker ........................... yes
      Native Spellchecker .................... no
      WebRTC ................................. yes
      Use System Ninja ....................... no
      Geolocation ............................ yes
      WebChannel support ..................... yes
      Use v8 snapshot ........................ yes
      Kerberos Authentication ................ no
      Extensions ............................. yes
      Use ALSA ............................... no
      Use PulseAudio ......................... no
      Optional system libraries used:
        re2 .................................. no
        icu .................................. no
        libwebp, libwebpmux and libwebpdemux . no
        opus ................................. no
        ffmpeg ............................... no
        libvpx ............................... no
        snappy ............................... no
        glib ................................. yes
        zlib ................................. yes
        minizip .............................. no
        libevent ............................. no
        jsoncpp .............................. no
        protobuf ............................. no
        libxml2 and libxslt .................. no
        lcms2 ................................ yes
        png .................................. yes
        JPEG ................................. yes
        harfbuzz ............................. no
        freetype ............................. yes
        x11 .................................. yes
      Required system libraries:
        fontconfig ........................... yes
        dbus ................................. yes
        nss .................................. no
        khr .................................. no
        glibc ................................ yes
      Required system libraries for qpa-xcb:
        libdrm ............................... yes
        xcomposite ........................... yes
        xcursor .............................. yes
        xi ................................... yes
        xtst ................................. yes
    Qt WebEngineQml:
      UI Delegates ........................... yes
      Test Support ........................... yes
    
    Note: Also available for Linux: linux-clang linux-icc
    
    Note: No wayland-egl support detected. Cross-toolkit compatibility disabled.
    
    WARNING: QDoc will not be compiled, probably because libclang could not be located. This means that you cannot build the Qt documentation.
    
    Either ensure that llvm-config is in your PATH environment variable, or set LLVM_INSTALL_DIR to the location of your llvm installation.
    On Linux systems, you may be able to install libclang by installing the libclang-dev or libclang-devel package, depending on your distribution.
    On macOS, you can use Homebrew's llvm package.
    On Windows, you must set LLVM_INSTALL_DIR to the installation path.
    
    WARNING: gperf is required to build QtWebEngine.
    
    WARNING: bison is required to build QtWebEngine.
    
    WARNING: flex is required to build QtWebEngine.
    
    Qt is now configured for building. Just run 'make'.
    Once everything is built, Qt is installed.
    You should NOT run 'make install'.
    Note that this build cannot be deployed to other machines or devices.
    
    Prior to reconfiguration, make sure you remove any leftovers from
    the previous build.
    

    Ah, indeed it says xkb is missing...

    So sudo apt install libxkbcommon-dev libxkbcommon-x11-dev


  • Lifetime Qt Champion

    It has been removed for the qtbase source tree as all the distributions supported have it.


  • Lifetime Qt Champion

    @SGaist I must have missed that mail ;)


  • Lifetime Qt Champion

    Well... It's in the change log :-)


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