raspberry pi 3- Qt 5.9 eglfs的错误

Question

我从git 5.9.2编译了最新版本的qt，最新的raspibian (2017-08-16-raspbian-tench.img)作为sysroot。

我以前安装了一些库来使用-opengl es2进行编译。编译成功，但当我运行应用程序时，我得到了以下错误：

该应用程序无法启动，因为它无法在"“中找到或加载Qt平台插件"eglfs”。 重新安装应用程序可能会解决此问题。 放弃

我拥有所有必需的库，没有任何未找到的依赖关系：

pi@raspberrypi:~/testrpi $ ls -lisa /usr/local/qt5pi/plugins/platforms
total 548 
260886   4 drwxr-sr-x 2 root staff   4096 août  19 14:15 .
260882   4 drwxr-sr-x 8 root staff   4096 août  19 14:32 ..
260915   8 -rwxrwxr-x 1 root staff   6976 août  19 14:15 libqeglfs.so
260932 224 -rwxrwxr-x 1 root staff 228732 août  19 14:15 libqlinuxfb.so
260930  92 -rwxrwxr-x 1 root staff  90796 août  19 14:15 libqminimalegl.so
260888  24 -rwxrwxr-x 1 root staff  21472 août  19 14:15 libqminimal.so
260890  76 -rwxrwxr-x 1 root staff  74744 août  19 14:15 libqoffscreen.so
260934 116 -rwxrwxr-x 1 root staff 116604 août  19 14:15 libqvnc.so

我已经很好地安装了libGLESv2和libEGL，libeglfs可以看到它们就像用ldd解决了一样：

pi@raspberrypi:~/testrpi $ ldd /usr/local/qt5pi/plugins/platforms/libqeglfs.so 
linux-vdso.so.1 (0x7ebd6000)
/usr/lib/arm-linux-gnueabihf/libarmmem.so (0x76f4f000)
libQt5EglFSDeviceIntegration.so.5 => /usr/local/qt5pi/lib/libQt5EglFSDeviceIntegration.so.5 (0x76eda000)
libQt5DBus.so.5 => /usr/local/qt5pi/lib/libQt5DBus.so.5 (0x76e6f000)
libfreetype.so.6 => /usr/lib/arm-linux-gnueabihf/libfreetype.so.6 (0x76dbf000)
libXext.so.6 => /usr/lib/arm-linux-gnueabihf/libXext.so.6 (0x76da0000)
libX11.so.6 => /usr/lib/arm-linux-gnueabihf/libX11.so.6 (0x76c7d000)
libEGL.so.1 => /usr/lib/arm-linux-gnueabihf/libEGL.so.1 (0x76c42000)
libQt5Gui.so.5 => /usr/local/qt5pi/lib/libQt5Gui.so.5 (0x768ab000)
libQt5Core.so.5 => /usr/local/qt5pi/lib/libQt5Core.so.5 (0x7643b000)
libdl.so.2 => /lib/arm-linux-gnueabihf/libdl.so.2 (0x76428000)
libGLESv2.so.2 => /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2 (0x7640e000)
libpthread.so.0 => /lib/arm-linux-gnueabihf/libpthread.so.0 (0x763e5000)
libstdc++.so.6 => /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 (0x7629d000)
libgcc_s.so.1 => /lib/arm-linux-gnueabihf/libgcc_s.so.1 (0x76270000)
libc.so.6 => /lib/arm-linux-gnueabihf/libc.so.6 (0x76131000)
libz.so.1 => /lib/arm-linux-gnueabihf/libz.so.1 (0x7610a000)
libpng16.so.16 => /usr/lib/arm-linux-gnueabihf/libpng16.so.16 (0x760d0000)
/lib/ld-linux-armhf.so.3 (0x76f76000)
libxcb.so.1 => /usr/lib/arm-linux-gnueabihf/libxcb.so.1 (0x760a1000)
libX11-xcb.so.1 => /usr/lib/arm-linux-gnueabihf/libX11-xcb.so.1 (0x7608f000)
libxcb-dri2.so.0 => /usr/lib/arm-linux-gnueabihf/libxcb-dri2.so.0 (0x7607b000)
libxcb-xfixes.so.0 => /usr/lib/arm-linux-gnueabihf/libxcb-xfixes.so.0 (0x76064000)
libxcb-dri3.so.0 => /usr/lib/arm-linux-gnueabihf/libxcb-dri3.so.0 (0x76051000)
libxcb-present.so.0 => /usr/lib/arm-linux-gnueabihf/libxcb-present.so.0 (0x7603e000)
libxcb-sync.so.1 => /usr/lib/arm-linux-gnueabihf/libxcb-sync.so.1 (0x76028000)
libxshmfence.so.1 => /usr/lib/arm-linux-gnueabihf/libxshmfence.so.1 (0x76016000)
libwayland-client.so.0 => /usr/lib/arm-linux-gnueabihf/libwayland-client.so.0 (0x75ffc000)
libwayland-server.so.0 => /usr/lib/arm-linux-gnueabihf/libwayland-server.so.0 (0x75fdf000)
libgbm.so.1 => /usr/lib/arm-linux-gnueabihf/libgbm.so.1 (0x75fc4000)
libexpat.so.1 => /lib/arm-linux-gnueabihf/libexpat.so.1 (0x75f92000)
libm.so.6 => /lib/arm-linux-gnueabihf/libm.so.6 (0x75f13000)
libdrm.so.2 => /usr/lib/arm-linux-gnueabihf/libdrm.so.2 (0x75ef6000)
libglapi.so.0 => /usr/lib/arm-linux-gnueabihf/libglapi.so.0 (0x75ebd000)
libXau.so.6 => /usr/lib/arm-linux-gnueabihf/libXau.so.6 (0x75eb2000)
libXdmcp.so.6 => /usr/lib/arm-linux-gnueabihf/libXdmcp.so.6 (0x75e9d000)
libffi.so.6 => /usr/lib/arm-linux-gnueabihf/libffi.so.6 (0x75e85000)
librt.so.1 => /lib/arm-linux-gnueabihf/librt.so.1 (0x75e6e000)
libbsd.so.0 => /lib/arm-linux-gnueabihf/libbsd.so.0 (0x75e45000)

我测试了用QT_QPA_PLATFORM_PLUGIN_PATH的位置设置libqeglfs.so，但仍然存在相同的错误：

此应用程序无法启动，因为它无法找到或加载Qt平台插件"eglfs“。 在"/usr/local/qt5pi/plugins/platforms“中。 重新安装应用程序可能会解决此问题。 放弃

关于这个严重的问题我需要你的帮助！谢谢。

有关配置的更新

配置命令：

./configure -opengl es2 -device linux-rasp-pi3-g++ -device-option CROSS_COMPILE=~/opt/gcc-linaro-5.4.1-2017.05-i686_arm-linux-gnueabihf/bin/arm-linux-gnueabihf- -sysroot /mnt/rasp-pi-rootfs -opensource -confirm-license -reduce-exports -release -make libs -make tools -prefix /usr/local/qt5pi -hostprefix /usr/local/qt5pi -no-use-gold-linker

产出：

Configure summary:

Building on: linux-g++ (x86_64, CPU features: mmx sse sse2)
Building for: devices/linux-rasp-pi3-g++ (arm, CPU features: neon)
Configuration: cross_compile compile_examples enable_new_dtags largefile neon precompile_header shared rpath release c++11 c++14 c++1z concurrent dbus reduce_exports stl
Build options:
  Mode ................................... release
  Optimize release build for size ........ no
  Building shared libraries .............. yes
  Using C++ standard ..................... C++1z
  Using gold linker ...................... no
  Using new DTAGS ........................ yes
  Using precompiled headers .............. yes
  Using LTCG ............................. no
  Target compiler supports:
    NEON ................................. yes
  Build parts ............................ libs tools
Qt modules and options:
  Qt Concurrent .......................... yes
  Qt D-Bus ............................... yes
  Qt D-Bus directly linked to libdbus .... no
  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
  QML debugging .......................... yes
  udev ................................... no
  Using system zlib ...................... yes
Qt Core:
  DoubleConversion ....................... yes
    Using system DoubleConversion ........ no
  GLib ................................... no
  iconv .................................. yes
  ICU .................................... no
  Logging backends:
    journald ............................. no
    syslog ............................... no
    slog2 ................................ no
  Using system PCRE2 ..................... no
Qt Network:
  getaddrinfo() .......................... yes
  getifaddrs() ........................... yes
  IPv6 ifname ............................ yes
  libproxy ............................... no
  OpenSSL ................................ no
    Qt directly linked to OpenSSL ........ no
  SCTP ................................... no
  Use system proxies ..................... yes
Qt Gui:
  Accessibility .......................... yes
  FreeType ............................... yes
    Using system FreeType ................ yes
  HarfBuzz ............................... yes
    Using system HarfBuzz ................ no
  Fontconfig ............................. no
  Image formats:
    GIF .................................. yes
    ICO .................................. yes
    JPEG ................................. yes
      Using system libjpeg ............... no
    PNG .................................. yes
      Using system libpng ................ yes
  EGL .................................... yes
  OpenVG ................................. no
  OpenGL:
    Desktop OpenGL ....................... no
    OpenGL ES 2.0 ........................ yes
    OpenGL ES 3.0 ........................ yes
    OpenGL ES 3.1 ........................ yes
  Session Management ..................... yes
Features used by QPA backends:
  evdev .................................. yes
  libinput ............................... no
  INTEGRITY HID .......................... no
  mtdev .................................. no
  tslib .................................. no
  xkbcommon-evdev ........................ no
QPA backends:
  DirectFB ............................... no
  EGLFS .................................. yes
  EGLFS details:
    EGLFS i.Mx6 .......................... no
    EGLFS i.Mx6 Wayland .................. no
    EGLFS EGLDevice ...................... yes
    EGLFS GBM ............................ no
    EGLFS Mali ........................... no
    EGLFS Raspberry Pi ................... no
    EGL on X11 ........................... yes
  LinuxFB ................................ yes
  VNC .................................... yes
  Mir client ............................. no
Qt Widgets:
  GTK+ ................................... no
  Styles ................................. Fusion Windows
Qt PrintSupport:
  CUPS ................................... no
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

Note: Also available for Linux: linux-clang linux-icc

Qt is now configured for building. Just run 'make'.
Once everything is built, you must run 'make install'.
Qt will be installed into '/mnt/rasp-pi-rootfs/usr/local/qt5pi'.

Prior to reconfiguration, make sure you remove any leftovers from
the previous build.

Answer 1

我至少发现了一个问题。

首先，您的配置显示您正在使用标准设备linux-rasp-pi3-g++，，但您的ldd显示您的应用程序链接到Mesa版本的GLES：

libGLESv2.so.2 => /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2

据我所知，如果您使用Linuxrasp-PI3-g++，则必须在/opt/vc/lib/中使用Broadcom提供的GLES和EGL。

解决方案：

1. 卸载正式台面：libgles2-mesa，libegl-mesa (内存中的包名)
2. 将/opt/vc/lib/中的每个库都链接到/usr/lib/arm-linux-gnueabihf/
3. 添加缺少的符号链接：sudo ln -s libEGL.so libEGL.so.1和sudo ln -s libGLESv2.so libGLESv2.so.2

提示:在你摆脱台面之前，试试export LD_LIBRARY_PATH=/opt/vc/lib/ your-executable吧。