SDK built with meta-qt6 fails to load QML application in runtime

Rukshan Perera · wrote on 6 Feb 2025, 14:39

How to get more information about this fail? Using a SDK build using yocto meta_qt6 layer.

16:24:12: Starting /home/krv/Qt/Examples/Qt-6.8.1/demos/calqlatr/build/Desktop_SDK-Debug/calqlatrexample -platform xcb...
qt.core.plugin.factoryloader: checking directory path "/home/krv/Qt/Examples/Qt-6.8.1/demos/calqlatr/build/Desktop_SDK-Debug/platforms" ...
qt.core.plugin.factoryloader: checking directory path "/opt/.../sysroots/core-64-poky-linux/usr/lib/plugins/platforms" ...
qt.core.plugin.factoryloader: looking at "libqxcb.so"
qt.core.plugin.loader: Found metadata in lib /opt/.../sysroots/core-64-poky-linux/usr/lib/plugins/platforms/libqxcb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "xcb"
        ]
    },
    "archlevel": 2,
    "className": "QXcbIntegrationPlugin",
    "debug": false,
    "version": 395264
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("xcb")
qt.core.plugin.factoryloader: looking at "libqvnc.so"
qt.core.plugin.loader: Found metadata in lib /opt/.../sysroots/core-64-poky-linux/usr/lib/plugins/platforms/libqvnc.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "vnc"
        ]
    },
    "archlevel": 2,
    "className": "QVncIntegrationPlugin",
    "debug": false,
    "version": 395264
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("vnc")
qt.core.plugin.factoryloader: looking at "libqoffscreen.so"
qt.core.plugin.loader: Found metadata in lib /opt/.../sysroots/core-64-poky-linux/usr/lib/plugins/platforms/libqoffscreen.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "offscreen"
        ]
    },
    "archlevel": 2,
    "className": "QOffscreenIntegrationPlugin",
    "debug": false,
    "version": 395264
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("offscreen")
qt.core.plugin.factoryloader: looking at "libqminimalegl.so"
qt.core.plugin.loader: Found metadata in lib /opt/.../sysroots/core-64-poky-linux/usr/lib/plugins/platforms/libqminimalegl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimalegl"
        ]
    },
    "archlevel": 2,
    "className": "QMinimalEglIntegrationPlugin",
    "debug": false,
    "version": 395264
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("minimalegl")
qt.core.plugin.factoryloader: looking at "libqlinuxfb.so"
qt.core.plugin.loader: Found metadata in lib /opt/.../sysroots/core-64-poky-linux/usr/lib/plugins/platforms/libqlinuxfb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "linuxfb"
        ]
    },
    "archlevel": 2,
    "className": "QLinuxFbIntegrationPlugin",
    "debug": false,
    "version": 395264
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("linuxfb")
qt.core.plugin.factoryloader: looking at "libqminimal.so"
qt.core.plugin.loader: Found metadata in lib /opt/.../sysroots/core-64-poky-linux/usr/lib/plugins/platforms/libqminimal.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "archlevel": 2,
    "className": "QMinimalIntegrationPlugin",
    "debug": false,
    "version": 395264
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("minimal")
qt.core.plugin.factoryloader: looking at "libqeglfs.so"
qt.core.plugin.loader: Found metadata in lib /opt/.../sysroots/core-64-poky-linux/usr/lib/plugins/platforms/libqeglfs.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "eglfs"
        ]
    },
    "archlevel": 2,
    "className": "QEglFSIntegrationPlugin",
    "debug": false,
    "version": 395264
}


qt.core.plugin.factoryloader: Got keys from plugin meta data QList("eglfs")
qt.core.library: "/opt/../sysroots/core-64-poky-linux/usr/lib/plugins/platforms/libqxcb.so" loaded library
qt.core.plugin.factoryloader: checking directory path "/home/krv/Qt/Examples/Qt-6.8.1/demos/calqlatr/build/Desktop_SDK-Debug/platformthemes" ...
qt.core.plugin.factoryloader: checking directory path "/opt/.../sysroots/core-64-poky-linux/usr/lib/plugins/platforms" ...
qt.core.plugin.factoryloader: looking at "libqxcb.so"
qt.core.plugin.factoryloader: Got keys from plugin meta data QList()
qt.core.plugin.factoryloader: looking at "libqvnc.so"
qt.core.plugin.factoryloader: Got keys from plugin meta data QList()
qt.core.plugin.factoryloader: looking at "libqoffscreen.so"
qt.core.plugin.factoryloader: Got keys from plugin meta data QList()
qt.core.plugin.factoryloader: looking at "libqminimalegl.so"
qt.core.plugin.factoryloader: Got keys from plugin meta data QList()
qt.core.plugin.factoryloader: looking at "libqlinuxfb.so"
qt.core.plugin.factoryloader: Got keys from plugin meta data QList()
qt.core.plugin.factoryloader: looking at "libqminimal.so"
qt.core.plugin.factoryloader: Got keys from plugin meta data QList()
qt.core.plugin.factoryloader: looking at "libqeglfs.so"
qt.core.plugin.factoryloader: Got keys from plugin meta data QList()
qt.core.plugin.factoryloader: checking directory path "/home/krv/Qt/Examples/Qt-6.8.1/demos/calqlatr/build/Desktop_SDK-Debug/platforminputcontexts" ...
qt.core.plugin.loader: Found metadata in lib /opt/.../sysroots/core-64-poky-linux/usr/lib/qml/QtQuick/Window/libquickwindowplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QQmlEngineExtensionInterface",
    "archlevel": 2,
    "className": "QtQuick_WindowPlugin",
    "debug": false,
    "uri": [
        "QtQuick.Window"
    ],
    "version": 395264
}


qt.core.library: "/opt/.../sysroots/core-64-poky-linux/usr/lib/qml/QtQuick/Window/libquickwindowplugin.so" loaded library
qt.core.plugin.loader: Found metadata in lib /opt/.../sysroots/core-64-poky-linux/usr/lib/qml/QtQuick/Layouts/libqquicklayoutsplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QQmlEngineExtensionInterface",
    "archlevel": 2,
    "className": "QtQuickLayoutsPlugin",
    "debug": false,
    "uri": [
        "QtQuick.Layouts"
    ],
    "version": 395264
}


qt.core.library: "/opt/.../sysroots/core-64-poky-linux/usr/lib/qml/QtQuick/Layouts/libqquicklayoutsplugin.so" loaded library
qt.core.plugin.loader: Found metadata in lib /opt/.../sysroots/core-64-poky-linux/usr/lib/qml/QtQuick/Controls/libqtquickcontrols2plugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QQmlExtensionInterface/1.0",
    "archlevel": 2,
    "className": "QtQuickControls2Plugin",
    "debug": false,
    "uri": [
        "QtQuick.Controls"
    ],
    "version": 395264
}


qt.core.library: "/opt/.../sysroots/core-64-poky-linux/usr/lib/qml/QtQuick/Controls/libqtquickcontrols2plugin.so" loaded library
qt.core.plugin.loader: Found metadata in lib /opt/.../sysroots/core-64-poky-linux/usr/lib/qml/QtQuick/Controls/Basic/libqtquickcontrols2basicstyleplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QQmlExtensionInterface/1.0",
    "archlevel": 2,
    "className": "QtQuickControls2BasicStylePlugin",
    "debug": false,
    "uri": [
        "QtQuick.Controls.Basic"
    ],
    "version": 395264
}


qt.core.library: "/opt/.../sysroots/core-64-poky-linux/usr/lib/qml/QtQuick/Controls/Basic/libqtquickcontrols2basicstyleplugin.so" loaded library
qt.core.plugin.loader: Found metadata in lib /opt/.../sysroots/core-64-poky-linux/usr/lib/qml/QtQuick/Templates/libqtquicktemplates2plugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QQmlExtensionInterface/1.0",
    "archlevel": 2,
    "className": "QtQuickTemplates2Plugin",
    "debug": false,
    "uri": [
        "QtQuick.Templates"
    ],
    "version": 395264
}


qt.core.library: "/opt/.../sysroots/core-64-poky-linux/usr/lib/qml/QtQuick/Templates/libqtquicktemplates2plugin.so" loaded library
qt.core.plugin.loader: Found metadata in lib /opt/.../sysroots/core-64-poky-linux/usr/lib/qml/QtQuick/Controls/impl/libqtquickcontrols2implplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QQmlEngineExtensionInterface",
    "archlevel": 2,
    "className": "QtQuickControls2ImplPlugin",
    "debug": false,
    "uri": [
        "QtQuick.Controls.impl"
    ],
    "version": 395264
}


qt.core.library: "/opt/.../sysroots/core-64-poky-linux/usr/lib/qml/QtQuick/Controls/impl/libqtquickcontrols2implplugin.so" loaded library
qt.core.plugin.factoryloader: checking directory path "/home/krv/Qt/Examples/Qt-6.8.1/demos/calqlatr/build/Desktop_SDK-Debug/xcbglintegrations" ...
Fontconfig warning: "/usr/share/fontconfig/conf.avail/05-reset-dirs-sample.conf", line 6: unknown element "reset-dirs"
qt.core.plugin.factoryloader: checking directory path "/home/krv/Qt/Examples/Qt-6.8.1/demos/calqlatr/build/Desktop_SDK-Debug/imageformats" ...
QXcbIntegration: Cannot create platform OpenGL context, neither GLX nor EGL are enabled
QRhiGles2: Failed to create temporary context
QXcbIntegration: Cannot create platform offscreen surface, neither GLX nor EGL are enabled
QXcbIntegration: Cannot create platform OpenGL context, neither GLX nor EGL are enabled
QRhiGles2: Failed to create context
Failed to create RHI (backend 2)
Failed to initialize graphics backend for OpenGL.

XDG_SESSION_TYPE=x11

I also have these env variable setup in qtcreator.

QT_HOST_PATH=/opt/.../sysroots/core-64-poky-linux/../x86_64-pokysdk-linux/usr
QT_QPA_PLATFORM_PLUGIN_PATH=/opt/.../sysroots/core-64-poky-linux/usr/lib/plugins/platforms
QT_DEBUG_PLUGINS=1
QML_IMPORT_PATH=/opt/.../sysroots/core-64-poky-linux/usr/lib/qml
LD_LIBRARY_PATH=/opt/.../sysroots/core-64-poky-linux/usr/lib

 ldd /opt/sysroots/core-64-poky-linux/usr/lib/plugins/platforms/libqxcb.so
/opt/.../sysroots/core-64-poky-linux/usr/lib/plugins/platforms/libqxcb.so: /lib/x86_64-linux-gnu/libQt6Core.so.6: version `Qt_6.8' not found (required by /opt/.../sysroots/core-64-poky-linux/usr/lib/plugins/platforms/libqxcb.so)
        linux-vdso.so.1 (0x00007ffe9fb0c000)
        libQt6XcbQpa.so.6 => /lib/x86_64-linux-gnu/libQt6XcbQpa.so.6 (0x000070aaf269f000)
        libQt6Gui.so.6 => /lib/x86_64-linux-gnu/libQt6Gui.so.6 (0x000070aaf1e00000)
        libQt6Core.so.6 => /lib/x86_64-linux-gnu/libQt6Core.so.6 (0x000070aaf1800000)
        libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x000070aaf1400000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x000070aaf1000000)
        libxcb-icccm.so.4 => /lib/x86_64-linux-gnu/libxcb-icccm.so.4 (0x000070aaf2696000)
        libxcb-image.so.0 => /lib/x86_64-linux-gnu/libxcb-image.so.0 (0x000070aaf2690000)
        libxcb-keysyms.so.1 => /lib/x86_64-linux-gnu/libxcb-keysyms.so.1 (0x000070aaf268b000)
        libxcb-randr.so.0 => /lib/x86_64-linux-gnu/libxcb-randr.so.0 (0x000070aaf267a000)
        libxcb-render.so.0 => /lib/x86_64-linux-gnu/libxcb-render.so.0 (0x000070aaf266b000)
        libxcb-render-util.so.0 => /lib/x86_64-linux-gnu/libxcb-render-util.so.0 (0x000070aaf2664000)
        libxcb-shape.so.0 => /lib/x86_64-linux-gnu/libxcb-shape.so.0 (0x000070aaf265d000)
        libxcb-shm.so.0 => /lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x000070aaf2658000)
        libxcb-sync.so.1 => /lib/x86_64-linux-gnu/libxcb-sync.so.1 (0x000070aaf264f000)
        libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x000070aaf2626000)
        libxcb-xfixes.so.0 => /lib/x86_64-linux-gnu/libxcb-xfixes.so.0 (0x000070aaf261c000)
        libxcb-xkb.so.1 => /lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x000070aaf25fe000)
        libxkbcommon.so.0 => /lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x000070aaf25b3000)
        libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x000070aaf16b7000)
        libX11-xcb.so.1 => /lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x000070aaf25ae000)
        libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x000070aaf12c3000)
        libSM.so.6 => /lib/x86_64-linux-gnu/libSM.so.6 (0x000070aaf25a4000)
        libICE.so.6 => /lib/x86_64-linux-gnu/libICE.so.6 (0x000070aaf2588000)
        libxkbcommon-x11.so.0 => /lib/x86_64-linux-gnu/libxkbcommon-x11.so.0 (0x000070aaf257c000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x000070aaf1d17000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x000070aaf254e000)
        libEGL.so.1 => /lib/x86_64-linux-gnu/libEGL.so.1 (0x000070aaf253c000)
        libfontconfig.so.1 => /lib/x86_64-linux-gnu/libfontconfig.so.1 (0x000070aaf1272000)
        libQt6DBus.so.6 => /lib/x86_64-linux-gnu/libQt6DBus.so.6 (0x000070aaf0f4b000)
        libGLX.so.0 => /lib/x86_64-linux-gnu/libGLX.so.0 (0x000070aaf1684000)
        libOpenGL.so.0 => /lib/x86_64-linux-gnu/libOpenGL.so.0 (0x000070aaf1247000)
        libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x000070aaf0f13000)
        libharfbuzz.so.0 => /lib/x86_64-linux-gnu/libharfbuzz.so.0 (0x000070aaf0e06000)
        libmd4c.so.0 => /lib/x86_64-linux-gnu/libmd4c.so.0 (0x000070aaf1235000)
        libfreetype.so.6 => /lib/x86_64-linux-gnu/libfreetype.so.6 (0x000070aaf0d3a000)
        libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x000070aaf1219000)
        libicui18n.so.74 => /lib/x86_64-linux-gnu/libicui18n.so.74 (0x000070aaf0800000)
        libicuuc.so.74 => /lib/x86_64-linux-gnu/libicuuc.so.74 (0x000070aaf0400000)
        libdouble-conversion.so.3 => /lib/x86_64-linux-gnu/libdouble-conversion.so.3 (0x000070aaf0d25000)
        libb2.so.1 => /lib/x86_64-linux-gnu/libb2.so.1 (0x000070aaf0d07000)
        libpcre2-16.so.0 => /lib/x86_64-linux-gnu/libpcre2-16.so.0 (0x000070aaf0c7b000)
        libzstd.so.1 => /lib/x86_64-linux-gnu/libzstd.so.1 (0x000070aaf0bc1000)
        /lib64/ld-linux-x86-64.so.2 (0x000070aaf2761000)
        libxcb-util.so.1 => /lib/x86_64-linux-gnu/libxcb-util.so.1 (0x000070aaf1d0f000)
        libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x000070aaf167e000)
        libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x000070aaf0bb9000)
        libpcre2-8.so.0 => /lib/x86_64-linux-gnu/libpcre2-8.so.0 (0x000070aaf0766000)
        libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x000070aaf0baf000)
        libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x000070aaf0b99000)
        libGLdispatch.so.0 => /lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x000070aaf06ae000)
        libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x000070aaf0b6e000)
        libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x000070aaf065f000)
        libgraphite2.so.3 => /lib/x86_64-linux-gnu/libgraphite2.so.3 (0x000070aaf0639000)
        libbz2.so.1.0 => /lib/x86_64-linux-gnu/libbz2.so.1.0 (0x000070aaf0b5a000)
        libbrotlidec.so.1 => /lib/x86_64-linux-gnu/libbrotlidec.so.1 (0x000070aaf062b000)
        libicudata.so.74 => /lib/x86_64-linux-gnu/libicudata.so.74 (0x000070aaee600000)
        libgomp.so.1 => /lib/x86_64-linux-gnu/libgomp.so.1 (0x000070aaf03aa000)
        libmd.so.0 => /lib/x86_64-linux-gnu/libmd.so.0 (0x000070aaf061c000)
        libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x000070aaee520000)
        libbrotlicommon.so.1 => /lib/x86_64-linux-gnu/libbrotlicommon.so.1 (0x000070aaf0387000)
        libcap.so.2 => /lib/x86_64-linux-gnu/libcap.so.2 (0x000070aaf060f000)
        libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x000070aaee3d8000)
        liblz4.so.1 => /lib/x86_64-linux-gnu/liblz4.so.1 (0x000070aaf0365000)
        liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x000070aaee3a6000)
        libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x000070aaee381000)

I can run Qt desktop applications built on the same environment with normal qt installation.

Distributor ID: Ubuntu
Description:    Ubuntu 24.04.1 LTS
Release:        24.04
Codename:       noble

Axel Spoerl · wrote on 9 Feb 2025, 08:44

Hi,
I assume that GL is enabled and supported on your device, so hardware can be excluded as the trouble maker.
LD_LIBRARY_PATH points out of the sysroot. I wouldn’t recommend to use it at all in cross compile environments. Better to set an RPATH instead.

On a side note: Ubuntu 24 isn’t supported yet. We’re working on it. Better try 22, just to exclude one more potential issue.

Rukshan Perera · wrote on 10 Feb 2025, 15:52

Okay thank you. I am now working on Ubuntu 22.04.5 LTS

I believe I may have only one problem to solve now. How to influence imageformats path looking for imageformat libraries in the source path. All the other plugins are fixed by
QT_QPA_PLATFORM_PLUGIN_PATH=/opt/.../core-64-poky-linux/usr/lib/plugins/platforms

qt.core.plugin.factoryloader: checking directory path "/home/.../projects/.../src/ui/imageformats" ...