Qt6 and EGLFS on Yocto

chocblops

Hi,

I have a problem integrating Qt6 with EGLFS into my Yocto build.

Host: Ubuntu 22.04 (x86_64)
Target device: STM32MP157

I prepared my Yocto build environment by cloning Poky (Kirkstone, 4.0.x), added the BSP support layers (meta-st-stm32mp and meta-st-stm32mp-addons, most recent version for Kirkstone) and finally meta-qt6 (branch 6.2). Machine and distro files are based on the templates from ST. Without any further modifications everything builds fine.

To enable EGLFS I created a new layer containing a recipe qtbase_%.bbappend with the following content:

PACKAGECONFIG_GL = " ${@bb.utils.contains('DISTRO_FEATURES', 'opengl', 'gles2', '', d)} "
PACKAGECONFIG:append = " eglfs kms gbm linuxfb fontconfig icu accessibility "
QT_CONFIG_FLAGS += " -no-sse2 -no-opengles3"

I added opengl to DISTRO_FEATURES and removed x11 and wayland. packagegroup-qt6-essentials, which is provided by meta-qt6, is added to IMAGE_INSTALL as well as inherit populate_sdk_qt6 to the image recipe. The content of populate_sdk_qt6.bbclass is

inherit populate_sdk_qt6_base

TOOLCHAIN_HOST_TASK:append = " nativesdk-packagegroup-qt6-toolchain-host-essentials"
# TOOLCHAIN_TARGET_TASK:append = " packagegroup-qt6-modules"

When I bitbake my image, the following error is thrown from qtbase-native:

 ERROR: Feature "eglfs": Forcing to "ON" breaks its condition:
     NOT ANDROID AND NOT APPLE AND NOT WIN32 AND NOT WASM AND NOT QNX AND QT_FEATURE_egl
 Condition values dump:
     ANDROID = "0"
     APPLE = ""
     WIN32 = ""
     WASM = "0"
     QNX = "0"
     QT_FEATURE_egl = "OFF"

Configure summary:

 Building for: linux-g++ (x86_64, CPU features: mmx sse sse2)
 Compiler: gcc 11.3.0
 Build options:
   Mode ................................... release
   Optimize release build for size ........ no
   Fully optimize release builds (-O3) .... no
   Building shared libraries .............. yes
   Using C standard ....................... C11
   Using C++ standard ..................... C++17
   Using ccache ........................... no
   Using new DTAGS ........................ yes
   Relocatable ............................ yes
   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 compiler architecture option  yes
   Sanitizers:
     Addresses ............................ no
     Threads .............................. no
     Memory ............................... no
     Fuzzer (instrumentation only) ........ no
     Undefined ............................ no
   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 PrintSupport ........................ 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 ...................... no
   Thread support ......................... yes
 Common build options:
   Linker can resolve circular dependencies  yes
 Qt Core:
   backtrace .............................. no
   DoubleConversion ....................... yes
     Using system DoubleConversion ........ no
   GLib ................................... no
   ICU .................................... yes
   Using system libb2 ..................... no
   Built-in copy of the MIME database ..... yes
   cpp/winrt base ......................... no
   Tracing backend ........................ <none>
   Logging backends:
     journald ............................. no
     syslog ............................... no
     slog2 ................................ no
   PCRE2 .................................. yes
     Using system PCRE2 ................... yes
   CLONE_PIDFD support in forkfd .......... yes
 Qt Sql:
   SQL item models ........................ yes
 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
   GSSAPI ................................. no
   Brotli Decompression Support ........... no
 Qt Gui:
   Accessibility .......................... yes
   FreeType ............................... yes
     Using system FreeType ................ yes
   HarfBuzz ............................... no
     Using system HarfBuzz ................ no
   Fontconfig ............................. yes
   Image formats:
     GIF .................................. yes
     ICO .................................. yes
     JPEG ................................. no
       Using system libjpeg ............... no
     PNG .................................. yes
       Using system libpng ................ yes
   Text formats:
     HtmlParser ........................... yes
     CssParser ............................ yes
     OdfWriter ............................ yes
     MarkdownReader ....................... yes
       Using system libmd4c ............... no
     MarkdownWriter ....................... yes
   EGL .................................... no
   OpenVG ................................. no
   OpenGL:
     Desktop OpenGL ....................... no
     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
     xkbcommon-x11 ........................ no
     xcb-sm ............................... no
 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 ............................ no
   LinuxFB ................................ yes
   VNC .................................... yes
   VK_KHR_display ......................... no
   QNX:
     lgmon ................................ no
     IMF .................................. no
   XCB:
     Using system-provided xcb-xinput ..... no
     GL integrations:
       GLX Plugin ......................... no
         XCB GLX .......................... no
       EGL-X11 Plugin ..................... no
   Windows:
     Direct 2D ............................ no
     Direct 2D 1.1 ........................ no
     DirectWrite .......................... no
     DirectWrite 3 ........................ no
 Qt Widgets:
   GTK+ ................................... no
   Styles ................................. Fusion Windows
 Qt Testlib:
   Tester for item models ................. yes
 Qt PrintSupport:
   CUPS ................................... no
 Qt Sql Drivers:
   DB2 (IBM) .............................. no
   InterBase .............................. no
   MySql .................................. no
   OCI (Oracle) ........................... no
   ODBC ................................... no
   PostgreSQL ............................. no
   SQLite ................................. no
     Using system provided SQLite ......... no
 Core tools:
   qmake tool ............................. yes

Taking a closer look into the do_configure log file reveals that test HAVE_EGL succeeded although EGL is stated as "no" in the summary.

-- Performing Test HAVE_EGL
-- Performing Test HAVE_EGL - Success
-- Found EGL: /.../build/tmp/work/x86_64-linux/qtbase-native/6.2.5-r0/recipe-sysroot-native/usr/include (found version "1.5")

libEGL.so is available in recipe-sysroot-native/usr/lib.

This error was also described in another thread, but without solution:
https://forum.qt.io/topic/105367/yocto-poky-thud-not-enabling-eglfs-and-opengl-es-2-0
This seems similar (found EGL version, but missing HAVE_EGL flag):
https://forum.qt.io/topic/131875/qt6-2-for-jetson-tx2nx-eglfs-configuration-problems

Can anyone tell me what I am doing wrong or how to further narrow down the error? I know the build system changed from Qt5 to Qt6, but I'm not able to find the missing piece of information.

Best regards
Benjamin

chocblops

I have not yet been able to find out why the problem occurs, but I have found a workaround. The EGLFS backend for Qt 6.2 in Yocto compiles without problems if QT_FEATURE_egl and QT_FEATURE_opengl are manually set to ON, e.g. by adding

EXTRA_OECMAKE += "-DQT_FEATURE_egl=ON -DFEATURE_opengl=ON"

to the recipe. I hope this information helps someone.

himanshu.d

@chocblops said in Qt6 and EGLFS on Yocto:

FEATURE_opengl

When I enabled EXTRA_OECMAKE. I am getting below error:

ERROR: Feature "opengl": Forcing to "ON" breaks its condition:
    QT_FEATURE_opengl_desktop OR QT_FEATURE_opengl_dynamic OR QT_FEATURE_opengles2
Condition values dump:
    QT_FEATURE_opengl_desktop = "OFF"
    QT_FEATURE_opengl_dynamic = "OFF"
    QT_FEATURE_opengles2 = "OFF"

Could you please help me here?

TAERYA

@himanshu-d Have you solved this problem? I am facing the same issue.