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  1. Qt
  2. QTBUG-87220

qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in ""

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P3: Somewhat important
    • Resolution: Incomplete
    • Affects Version/s: 5.15.1
    • Fix Version/s: None
    • Component/s: Core: Plugins, QPA
    • Labels:
      None
    • Platform/s:
      Linux/X11, Other

      Description

      Hi Qt-Dev-Team,

       I try to update Qt from version 5.13.2 to Qt 5.15.1. Everything looks good so far, but since version 5.15.1 the plugins are no longer loaded without setting  QT_PLUGIN_PATH=/usr/local/lib/qt5/plugins/

       

      Configure summary:

      Configure summary: 
       
      Build type: openbsd-clang (x86_64, CPU features: mmx sse sse2) 
      Compiler: clang 10.0.1 
      Configuration: sse2 aesni largefile rdrnd rdseed shani x86SimdAlways shared shared rpath release c++11 c++14 c++17 c++1z concurrent dbus reduce_exports redu
      ce_relocations stl 
      Build options: 
       Mode ................................... release 
       Optimize release build for size ........ no 
       Building shared libraries .............. yes 
       Using C standard ....................... C11 
       Using C++ standard ..................... C++17 
       Using ccache ........................... no 
       Relocatable ............................ yes 
       Using precompiled headers .............. no 
       Using LTCG ............................. no 
       Target compiler supports: 
       SSE .................................. SSE2 
       AVX .................................. <none> 
       AVX512 ............................... <none> 
       Other x86 ............................ AES RDRAND SHA 
       Intrinsics without -mXXX option ...... yes 
       Build parts ............................ libs examples 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 ................................... no 
       Using system zlib ...................... yes 
       Zstandard support ...................... yes 
      Qt Core: 
       DoubleConversion ....................... yes 
       Using system DoubleConversion ........ yes 
       GLib ................................... yes 
       iconv .................................. no 
       ICU .................................... yes 
       Built-in copy of the MIME database ..... no 
       Tracing backend ........................ <none> 
       Logging backends: 
       journald ............................. no 
       syslog ............................... yes 
       slog2 ................................ no 
       PCRE2 .................................. no 
       Using system PCRE2 ................... yes 
      Qt Network: 
       getifaddrs() ........................... yes 
       IPv6 ifname ............................ yes 
       libproxy ............................... no 
       OpenSSL ................................ yes 
       Qt directly linked to OpenSSL ........ yes 
       OpenSSL 1.1 ............................ yes 
       DTLS ................................... no 
       OCSP-stapling .......................... yes 
       SCTP ................................... no 
       Use system proxies ..................... yes 
       GSSAPI ................................. no 
      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 
       Text formats: 
       HtmlParser ........................... yes 
       CssParser ............................ yes 
       OdfWriter ............................ yes 
       MarkdownReader ....................... yes 
       Using system libmd4c ............... no 
       MarkdownWriter ....................... yes 
       EGL .................................... yes 
       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 .................................. no 
       libinput ............................... no 
       INTEGRITY HID .......................... no 
       mtdev .................................. no 
       tslib .................................. no 
       xkbcommon .............................. yes 
       X11 specific: 
       XLib ................................. yes 
       XCB Xlib ............................. yes 
       EGL on X11 ........................... yes 
       xkbcommon-x11 ........................ yes 
      QPA backends: 
       DirectFB ............................... no 
       EGLFS .................................. yes 
       EGLFS details: 
       EGLFS OpenWFD ........................ no 
       EGLFS i.Mx6 .......................... no 
       EGLFS i.Mx6 Wayland .................. no 
       EGLFS RCAR ........................... no 
       EGLFS EGLDevice ...................... yes 
       EGLFS GBM ............................ yes 
       EGLFS VSP2 ........................... no 
       EGLFS Mali ........................... no 
       EGLFS Raspberry Pi ................... no 
       EGLFS X11 ............................ yes 
       LinuxFB ................................ no 
       VNC .................................... yes 
       XCB: 
       Using system-provided xcb-xinput ..... yes 
       Native painting (experimental) ....... no 
       GL integrations: 
       GLX Plugin ......................... yes 
       XCB GLX .......................... yes 
       EGL-X11 Plugin ..................... yes 
      Qt Sql: 
       SQL item models ........................ yes 
      Qt Widgets: 
       GTK+ ................................... yes 
       Styles ................................. Fusion Windows 
      Qt PrintSupport: 
       CUPS ................................... yes 
      Qt Sql Drivers: 
       DB2 (IBM) .............................. no 
       InterBase .............................. no 
       MySql .................................. yes 
       OCI (Oracle) ........................... no 
       ODBC ................................... no 
       PostgreSQL ............................. yes 
       SQLite2 ................................ yes 
       SQLite ................................. yes 
       Using system provided SQLite ......... yes 
       TDS (Sybase) ........................... yes 
      Qt Testlib: 
       Tester for item models ................. yes 
      Note: -headerdir is not a subdirectory of -prefix. 
      Note: -docdir is not a subdirectory of -prefix. Note: journald, syslog or slog2 integration is enabled. 
      If your users intend to develop applications against this build, 
      ensure that the IDEs they use either set QT_FORCE_STDERR_LOGGING to 1 
      or are able to read the logged output from journald, syslog or slog2. Qt is now configured for building. Just run 'gmake'. 
      Once everything is built, you must run 'gmake install'. 
      Qt will be installed into '/usr/local/lib/qt5'. Prior to reconfiguration, make sure you remove any leftovers from 
      the previous build.

       qtdiag-qt5

      $ qtdiag-qt5|grep plugin
       PluginsPath: /usr/local/lib/qt5/plugins
      
      $ ls /usr/local/lib/qt5/plugins 
      PyQt5 kauth playlistformats
      audio kcm_kio.so position
      bearer kcm_trash.so printsupport
      designer kcm_webshortcuts.so qmltooling
      egldeviceintegrations kf5 sensorgestures
      gamepads mediaservice sensors
      generic org.kde.kglobalaccel5.platforms spellcheckplugin.so
      geoservices platforminputcontexts sqldrivers
      iconengines platforms texttospeech
      imageformats platformthemes xcbglintegrations
      

       example application

      $ dragon
      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.[1]
      28012 abort (core dumped) dragon
      
      $ export QT_PLUGIN_PATH=/usr/local/lib/qt5/plugins/
      $ dragon 
      QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-rsadowski'
      kf.crash: Could not find drkonqi in search paths: ("/usr/local/bin", "/usr/local/lib/libexec", "/usr/local/libexec")
      ... dragon starts fine

      I hope the "Code" informations  are  helpful enough.

      Background Information
      I am working on the KDE/Qt packages for OpenBSD. I am an active maintainer of
      CMake, Qt and KDE Frameworks and KDE Applications on OpenBSD.

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            Assignee:
            qtbuildsystem Qt Build System Team
            Reporter:
            rsadowski Rafael Sadowski
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            Watchers:
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              Dates

              Created:
              Updated:
              Resolved:

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