This application failed to start because it could not find or load the Qt platform plugin "eglfs" in "/usr/local/qt5/plugins".

Alex_wang

when running Qt5 Example "qt5-cinematic-experience" , an error occurs :

QIconvCodec::convertToUnicode: using Latin-1 for conversion, iconv_open failed
QIconvCodec::convertFromUnicode: using Latin-1 for conversion, iconv_open failed
This application failed to start because it could not find or load the Qt platform plugin "eglfs"
in "/usr/local/qt5/plugins".

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb.

Reinstalling the application may fix this problem.
Aborted

env :

#export QTDIR=/usr/local/qt5
# export QT_QPA_FONTDIR=$QTDIR/lib/fonts
# export QT_QPA_PLATFORM_PLUGIN_PATH=$QTDIR/plugins
# export LD_LIBRARY_PATH=$QTDIR/lib:$LD_LIBRARY_PATH
# export PATH=$QTDIR/bin:$PATH
# export PKG_CONFIG_PATH=$QTDIR/lib/pkgconfig/$PKG_CONFIG_PATH

configure :

Build options:
  Mode ................................... release
  Building shared libraries .............. yes
  Using C++ standard ..................... C++11
  Using gold linker ...................... yes
  Using new DTAGS ........................ yes
  Using precompiled headers .............. yes
  Using LTCG ............................. no
  Target compiler supports:
    NEON ................................. no
  Build parts ............................ libs
Qt modules and options:
  Qt Concurrent .......................... yes
  Qt D-Bus ............................... yes
  Qt D-Bus directly linked to libdbus .... yes
  Qt Gui ................................. yes
  Qt Widgets ............................. yes
Support enabled for:
  Accessibility .......................... yes
  Using pkg-config ....................... yes
  QML debugging .......................... yes
  udev ................................... yes
  Using system zlib ...................... yes
Qt Core:
  DoubleConversion ....................... yes
    Using system DoubleConversion ........ no
  GLib ................................... yes
  iconv .................................. yes
  ICU .................................... no
  Logging backends:
    journald ............................. no
    syslog ............................... no
  Using system PCRE ...................... no
Qt Network:
  getaddrinfo() .......................... yes
  getifaddrs() ........................... yes
  IPv6 ifname ............................ yes
  libproxy ............................... no
  OpenSSL ................................ yes
    Qt directly linked to OpenSSL ........ no
  SCTP ................................... no
  Use system proxies ..................... yes
Qt Sql:
  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 Gui:
  FreeType ............................... yes
    Using system FreeType ................ yes
  HarfBuzz ............................... yes
    Using system HarfBuzz ................ no
  Fontconfig ............................. yes
  Image formats:
    GIF .................................. yes
    ICO .................................. yes
    JPEG ................................. yes
      Using system libjpeg ............... yes
    PNG .................................. yes
      Using system libpng ................ yes
  OpenGL:
    EGL .................................. yes
    Desktop OpenGL ....................... no
    OpenGL ES 2.0 ........................ yes
    OpenGL ES 3.0 ........................ no
    OpenGL ES 3.1 ........................ no
  Session Management ..................... yes
Features used by QPA backends:
  evdev .................................. yes
  libinput ............................... no
  mtdev .................................. no
  tslib .................................. yes
  xkbcommon-evdev ........................ no
QPA backends:
  DirectFB ............................... no
  EGLFS .................................. yes
  EGLFS details:
    EGLFS i.Mx6 .......................... no
    EGLFS i.Mx6 Wayland .................. no
    EGLFS EGLDevice ...................... no
    EGLFS GBM ............................ no
    EGLFS Mali ........................... no
    EGLFS Rasberry Pi .................... no
    EGL on X11 ........................... no
  LinuxFB ................................ yes
  Mir client ............................. no
  X11:
    Using system provided XCB libraries .. no
    EGL on X11 ........................... no
    Xinput2 .............................. no
    XCB XKB .............................. no
    XLib ................................. yes
    Xrender .............................. yes
    XCB GLX .............................. yes
    XCB Xlib ............................. yes
    Using system-provided xkbcommon ...... no
Qt Widgets:
  GTK+ ................................... no
  Styles ................................. Fusion Windows
Qt PrintSupport:
  CUPS ................................... no
Qt SerialBus:
  Socket CAN ............................. yes
  Socket CAN FD .......................... no
QtXmlPatterns:
  XML schema support ..................... yes
Qt QML:
  QML interpreter ........................ yes
  QML network support .................... yes
Qt Quick:
  Direct3D 12 ............................ no
  AnimatedImage item ..................... yes
  Canvas item ............................ yes
  Support for Quick Designer ............. yes
  Flipable item .......................... yes
  GridView item .......................... yes
  ListView item .......................... yes
  Path support ........................... yes
  PathView item .......................... yes
  Positioner items ....................... yes
  ShaderEffect item ...................... yes
  Sprite item ............................ yes
Qt Gamepad:
  SDL2 ................................... no
Qt 3D:
  System Assimp .......................... no
Qt Wayland Client ........................ no
Qt Wayland Compositor .................... no
Qt Bluetooth:
  BlueZ .................................. no
  BlueZ Low Energy ....................... no
  Linux Crypto API ....................... no
Qt Multimedia:
  ALSA ................................... yes
  GStreamer 1.0 .......................... no
  GStreamer 0.10 ......................... yes
  Video for Linux ........................ yes
  OpenAL ................................. no
  PulseAudio ............................. yes
  Resource Policy (libresourceqt5) ....... no
  DirectShow ............................. no
  Windows Media Foundation ............... no
Qt Location:
  Gypsy GPS Daemon ....................... no
  WinRT Geolocation API .................. no
Qt Sensors:
  sensorfw ............................... no
Qt WebEngine:
  Proprietary Codecs ..................... no
  Spellchecker ........................... yes
  ALSA ................................... yes
  PulseAudio ............................. yes

jsulm

@Alex_wang Set QT_DEBUG_PLUGINS environment variable and start your app, you should see more output which can help to find out why the plug-in isn't loaded.
See http://doc.qt.io/qt-5/debug.html

Alex_wang

This post is deleted!

Alex_wang

@jsulm

Thanks!

QFactoryLoader::QFactoryLoader() checking directory path "/opt/autorun/platforms" ...
Cannot load library /usr/local/qt5/plugins/platforms/libqeglfs.so: (libXext.so.6: cannot open shared object file: No such file or directory)
QLibraryPrivate::loadPlugin failed on "/usr/local/qt5/plugins/platforms/libqeglfs.so" : "Cannot load library /usr/local/qt5/plugins/platforms/libqeglfs.so: (libXext.so.6: cannot open shared object file: No such file or directory)"
This application failed to start because it could not find or load the Qt platform plugin "eglfs"
in "/usr/local/qt5/plugins".

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb.

Reinstalling the application may fix this problem.
Aborted

I think , I need to install the X11......

SGaist

Hi,

You should only need to install the libraries the compiler has been warning about. If on debian apt-get install libxext-dev.

Alex_wang

@SGaist
Hi,
I have been added all the libraries that qt5 app needs.
but when running the Qt5 app , the error occurs:

QFactoryLoader::QFactoryLoader() checking directory path "/opt/autorun/platforms" ...
loaded library "/usr/local/qt5/plugins/platforms/libqeglfs.so"
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/qt5/plugins/egldeviceintegrations" ...
QFactoryLoader::QFactoryLoader() checking directory path "/opt/autorun/egldeviceintegrations" ...
Could not open egl display
Aborted

any ideas ?

SGaist

On what are you running that application ?

Alex_wang

@SGaist

Hi,

device : TI DM8168/AM389x
arch : armv7-a

configure :

 Configuration .......... accessibility alsa audio-backend c++11 clock-gettime clock-monotonic compile_examples concurrent cross_compile dbus dbus-linked egl eglfs enable_new_dtags evdev eventfd fontconfig full-config getaddrinfo getifaddrs glib gstreamer-0.10 gtk2 gtkstyle harfbuzz iconv inotify ipv6ifname kms large-config largefile libudev linuxfb medium-config minimal-config mremap opengl opengles2 openssl openvg pcre png posix_fallocate precompile_header pulseaudio qpa qpa reduce_exports release rpath shared small-config system-freetype system-jpeg system-png system-zlib threadsafe-cloexec tslib xlib xrender 
  Build parts ............ libs
  Mode ................... release
  Using sanitizer(s)...... none
  Using C++ standard ..... c++11
  Using gold linker....... no
  Using new DTAGS ........ yes
  Using PCH .............. yes
  Using LTCG ............. no
  Target compiler supports:
    Neon ................. no

Qt modules and options:
  Qt D-Bus ............... yes (linked to dbus-1)
  Qt Concurrent .......... yes
  Qt GUI ................. yes
  Qt Widgets ............. yes
  Large File ............. yes
  QML debugging .......... yes
  Use system proxies ..... no

Support enabled for:
  Accessibility .......... yes
  ALSA ................... yes
  CUPS ................... no
  Evdev .................. yes
  FontConfig ............. yes
  FreeType ............... yes (system library)
  Glib ................... yes
  GStreamer .............. yes (0.10)
  GTK theme .............. yes
  HarfBuzz ............... yes (bundled copy)
  Iconv .................. yes
  ICU .................... no
  Image formats: 
    GIF .................. yes (plugin, using bundled copy)
    JPEG ................. yes (plugin, using system library)
    PNG .................. yes (in QtGui, using system library)
  libinput................ no
  Logging backends: 
    journald ............... no
    syslog   ............... no
  mtdev .................. no
  Networking: 
    getaddrinfo .......... yes
    getifaddrs ........... yes
    IPv6 ifname .......... yes
    libproxy.............. no
    OpenSSL .............. yes (loading libraries at run-time)
  OpenGL / OpenVG: 
    EGL .................. yes
    OpenGL ............... yes (OpenGL ES 2.0+)
    OpenVG ............... yes-auto
  PCRE ................... yes (bundled copy)
  pkg-config ............. yes 
  PulseAudio ............. yes
  QPA backends: 
    DirectFB ............. no
    EGLFS ................ yes
      EGLFS i.MX6 ........ no
      EGLFS i.MX6 Wayland. no
      EGLFS EGLDevice .... no
      EGLFS GBM .......... no
      EGLFS Mali ......... no
      EGLFS Raspberry Pi . no
      EGLFS X11 .......... no
    LinuxFB .............. yes
    Mir client............ no
    XCB .................. no
  Session management ..... yes
  SQL drivers: 
    DB2 .................. no
    InterBase ............ no
    MySQL ................ no
    OCI .................. no
    ODBC ................. no
    PostgreSQL ........... no
    SQLite 2 ............. no
    SQLite ............... yes (plugin, using bundled copy)
    TDS .................. no
  tslib .................. yes
  udev ................... yes
  xkbcommon-x11........... no
  xkbcommon-evdev......... no
  zlib ................... yes (system library)

Alex_wang

@jsulm
Hi,
can you tell me my eglfs plugin is right?
I want to use the eglfs_kms.....

SGaist

What device are you using exactly ?

Alex_wang

@SGaist
Hi, the device is ti DM8168/AM389x,its arm arch is armv7-a.
the configure result shows that :

KMS enabled.
......
EGL enabled.
......

egl-x11.cpp: In function 'int main(int, char**)':
egl-x11.cpp:48:50: error: invalid conversion from 'Display*' to 'EGLNativeDisplayType'
egl-x11.cpp:49:11: error: invalid conversion from 'EGLNativeDisplayType' to 'Display*'
egl-x11.cpp:50:79: error: invalid conversion from 'Window' to 'void*'
egl-x11.cpp:51:26: error: invalid conversion from 'void*' to 'Window'
egl-x11.cpp:51:26: error:   initializing argument 2 of 'int XDestroyWindow(Display*, Window)'
Makefile:239: recipe for target 'egl-x11.o' failed
make: *** [egl-x11.o] Error 1
**EGL-X11 disabled.**

so, the egl/x11 is old on my device ,that cause the error ?

SGaist

What Linux distribution are you using ?

Alex_wang

@SGaist
Hi,

Linux version 2.6.37+  (gcc version 4.5.3 20110311 (prerelease) (GCC) )

jsulm

@Alex_wang This is the Linux kernel version not the name and version of your Linux distribution.
And kernel is very old.

Alex_wang

@jsulm
Hi,
sorry,my kernel is from the DVRRDK(04.00.00.03) that ti provides,
I can't know the linux distribution.....

SGaist

Just because of the date I'd say that your dependencies are out of date.

You may try to patch Qt's to match your version of the relevant X11 libraries but there's not guaranty it's doable.

Alex_wang

@SGaist

I would to cross compile the latest libX11, and install ,
then the "EGL-X11 can be enabled" ?

SGaist

If possible you should rather upgrade your device distribution to something more recent.

Alex_wang

@SGaist
Hi,
Thanks for your reply.
Perhaps I can only do that.