Unsolved Cross compile Qt5.12.9 for raspberry pi 3b+ succeeds except OpenGL

[thoru]

Hello folks,

for cross compiling Qt5.12.9 for a Raspberry Pi 3b+ I followed the blog post https://mechatronicsblog.com/cross-compile-and-deploy-qt-5-12-for-raspberry-pi/
and https://wiki.qt.io/RaspberryPi2EGLFS. I've also run update-rpi before rsyncing my sysroot. Compiling succeeds. I also have support for eglfs on the pi. But I can't get openGl to work.

QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLShaderProgram: could not create shader program
shader compilation failed: 
""
QOpenGLShaderProgram::uniformLocation(matrix): shader program is not linked
QOpenGLShaderProgram::uniformLocation(opacity): shader program is not linked
QOpenGLShaderProgram: could not create shader program
shader compilation failed: 
""
QOpenGLShaderProgram::uniformLocation(matrix): shader program is not linked
QOpenGLShaderProgram::uniformLocation(textureScale): shader program is not linked
QOpenGLShaderProgram::uniformLocation(color): shader program is not linked
QOpenGLShaderProgram::uniformLocation(alphaMin): shader program is not linked
QOpenGLShaderProgram::uniformLocation(alphaMax): shader program is not linked
QOpenGLShaderProgram: could not create shader program

I have tried so many different combinations of symlinks, qmake.conf file edits (adding brcm), targets pi3-g++ and pi-g++, and whatever, I just can't get it to work.
I only see a white blank screen. There are pieces in my QML code that make use of OpacityMask and DropShadow to style an image. If I comment them out, the app runs just fine.

For example, here is my latest build with the pi-g++ device:

# qmake configuration for:
#  - Raspberry PI
#  - Raspberry PI Zero
# http://wiki.qt.io/RaspberryPi

include(../common/linux_device_pre.conf)

QMAKE_RPATHLINKDIR_POST += $$[QT_SYSROOT]/opt/vc/lib

QMAKE_LIBDIR_OPENGL_ES2 = $$[QT_SYSROOT]/opt/vc/lib
QMAKE_LIBDIR_EGL        = $$QMAKE_LIBDIR_OPENGL_ES2
QMAKE_LIBDIR_OPENVG     = $$QMAKE_LIBDIR_OPENGL_ES2

QMAKE_INCDIR_EGL        = $$[QT_SYSROOT]/opt/vc/include \
                          $$[QT_SYSROOT]/opt/vc/include/interface/vcos/pthreads \
                          $$[QT_SYSROOT]/opt/vc/include/interface/vmcs_host/linux
QMAKE_INCDIR_OPENGL_ES2 = $${QMAKE_INCDIR_EGL}
QMAKE_INCDIR_OPENVG     = $${QMAKE_INCDIR_EGL}

QMAKE_LIBS_EGL          = -lbrcmEGL -lbrcmGLESv2
QMAKE_LIBS_OPENVG       = -lbrcmEGL -lbrcmOpenVG -lbrcmGLESv2

QMAKE_INCDIR_BCM_HOST   = $$[QT_SYSROOT]/opt/vc/include
QMAKE_LIBDIR_BCM_HOST   = $$[QT_SYSROOT]/opt/vc/lib
QMAKE_LIBS_BCM_HOST     = -lbcm_host

contains(DISTRO, squeeze) {
    #Debian Squeeze: Legacy everything
    QMAKE_LIBS_OPENGL_ES2   = -lbrcmGLESv2 -lbrcmEGL
} else:contains(DISTRO, arch) {
    #On principle: no wizardry required
} else {
    #This is not strictly necessary
    DISTRO_OPTS += deb-multi-arch
    DISTRO_OPTS += hard-float
}

QMAKE_CFLAGS           += \
                          -marm \
                          -mfpu=vfp \
                          -mtune=arm1176jzf-s \
                          -march=armv6zk \
                          -mabi=aapcs-linux

QMAKE_CXXFLAGS          = $$QMAKE_CFLAGS

# Preferred eglfs backend
EGLFS_DEVICE_INTEGRATION = eglfs_brcm

include(../common/linux_arm_device_post.conf)

load(qt_config)

Qt config:

Configure summary:

Building on: linux-g++ (x86_64, CPU features: mmx sse sse2)
Building for: devices/linux-rasp-pi-g++ (arm, CPU features: <none>)
Target compiler: gcc 4.8.3
Configuration: cross_compile compile_examples enable_new_dtags largefile precompile_header shared rpath release c++11 concurrent dbus reduce_exports stl
Build options:
  Mode ................................... release
  Optimize release build for size ........ no
  Building shared libraries .............. yes
  Using C standard ....................... C11
  Using C++ standard ..................... C++11
  Using ccache ........................... no
  Using gold linker ...................... no
  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 Network ............................. yes
  Qt Sql ................................. yes
  Qt Testlib ............................. yes
  Qt Widgets ............................. yes
  Qt Xml ................................. yes
Support enabled for:
  Using pkg-config ....................... yes
  udev ................................... yes
  Using system zlib ...................... yes
Qt Core:
  DoubleConversion ....................... yes
    Using system DoubleConversion ........ yes
  GLib ................................... yes
  iconv .................................. yes
  ICU .................................... no
  Tracing backend ........................ <none>
  Logging backends:
    journald ............................. no
    syslog ............................... no
    slog2 ................................ no
  Using system PCRE2 ..................... 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
  SCTP ................................... no
  Use system proxies ..................... yes
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
  EGL .................................... yes
  OpenVG ................................. yes
  OpenGL:
    Desktop OpenGL ....................... no
    OpenGL ES 2.0 ........................ yes
    OpenGL ES 3.0 ........................ yes
    OpenGL ES 3.1 ........................ yes
    OpenGL ES 3.2 ........................ yes
  Vulkan ................................. yes
  Session Management ..................... yes
Features used by QPA backends:
  evdev .................................. yes
  libinput ............................... yes
  INTEGRITY HID .......................... no
  mtdev .................................. yes
  tslib .................................. yes
  xkbcommon .............................. yes
  X11 specific:
    XLib ................................. yes
    XCB Xlib ............................. yes
    EGL on X11 ........................... 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 ...................... no
    EGLFS GBM ............................ no
    EGLFS VSP2 ........................... no
    EGLFS Mali ........................... no
    EGLFS Raspberry Pi ................... yes
    EGLFS X11 ............................ no
  LinuxFB ................................ yes
  VNC .................................... yes
  Mir client ............................. no
  XCB:
    Using system-provided XCB libraries .. yes
    XCB XKB .............................. yes
    XCB XInput ........................... no
    Native painting (experimental) ....... yes
    GL integrations:
      GLX Plugin ......................... no
      EGL-X11 Plugin ..................... no
Qt Sql:
  SQL item models ........................ yes
Qt Widgets:
  GTK+ ................................... no
  Styles ................................. Fusion Windows
Qt PrintSupport:
  CUPS ................................... yes
Qt Sql Drivers:
  DB2 (IBM) .............................. no
  InterBase .............................. no
  MySql .................................. no
  OCI (Oracle) ........................... no
  ODBC ................................... yes
  PostgreSQL ............................. yes
  SQLite2 ................................ yes
  SQLite ................................. yes
    Using system provided SQLite ......... no
  TDS (Sybase) ........................... yes
Qt Testlib:
  Tester for item models ................. yes
Qt SerialBus:
  Socket CAN ............................. yes
  Socket CAN FD .......................... yes
Further Image Formats:
  JasPer ................................. no
  MNG .................................... yes
  TIFF ................................... yes
    Using system libtiff ................. yes
  WEBP ................................... yes
    Using system libwebp ................. no
Qt QML:
  QML network support .................... yes
  QML debugging and profiling support .... yes
  QML sequence object .................... yes
  QML list model ......................... yes
  QML XML http request ................... yes
  QML Locale ............................. yes
  QML delegate model ..................... yes
Qt Quick:
  Direct3D 12 ............................ no
  AnimatedImage item ..................... yes
  Canvas item ............................ yes
  Support for Qt Quick Designer .......... yes
  Flipable item .......................... yes
  GridView item .......................... yes
  ListView item .......................... yes
  TableView item ......................... yes
  Path support ........................... yes
  PathView item .......................... yes
  Positioner items ....................... yes
  Repeater item .......................... yes
  ShaderEffect item ...................... yes
  Sprite item ............................ yes
Qt Bluetooth:
  BlueZ .................................. no
  BlueZ Low Energy ....................... no
  Linux Crypto API ....................... no
  WinRT Bluetooth API (desktop & UWP) .... no
Qt Sensors:
  sensorfw ............................... no
Qt Quick Controls 2:
  Styles ................................. Default Fusion Imagine Material Universal
Qt Quick Templates 2:
  Hover support .......................... yes
  Multi-touch support .................... yes
Qt Multimedia:
  ALSA ................................... yes
  GStreamer 1.0 .......................... no
  GStreamer 0.10 ......................... no
  Video for Linux ........................ yes
  OpenAL ................................. yes
  PulseAudio ............................. yes
  Resource Policy (libresourceqt5) ....... no
  Windows Audio Services ................. no
  DirectShow ............................. no
  Windows Media Foundation ............... no
Qt Tools:
  QDoc ................................... no

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

Note: PKG_CONFIG_LIBDIR automatically set to /home/thomas/raspi/sysroot/usr/lib/pkgconfig:/home/thomas/raspi/sysroot/usr/share/pkgconfig:/home/thomas/raspi/sysroot/usr/lib/arm-linux-gnueabihf/pkgconfig

Command line:

-release -opengl es2 -eglfs -qpa eglfs -device linux-rasp-pi-g++ -device-option CROSS_COMPILE=/home/thomas/raspi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf- -sysroot /home/thomas/raspi/sysroot -opensource -confirm-license -make libs -prefix /usr/local/qt5pi -extprefix /home/thomas/raspi/qt5pi -hostprefix /home/thomas/raspi/qt5 -skip qt3d -skip qtactiveqt -skip qtandroidextras -skip qtcanvas3d -skip qtscript -skip qtcharts -skip qtdatavis3d -skip qtdoc -skip qtgamepad -skip qtlocation -skip qtmacextras -skip qtpurchasing -skip qtscript -skip qtscxml -skip qtspeech -skip qtvirtualkeyboard -skip qtwayland -skip qtwebchannel -skip qtwebengine -skip qtwebglplugin -skip qtwebsockets -skip qtwebview -skip qtwinextras -skip qtxmlpatterns -no-use-gold-linker -v -no-gbm

The links to the brcm libs:

lrwxrwxrwx 1 root root  /usr/lib/arm-linux-gnueabihf/libEGL.so.1.1.0 -> /opt/vc/lib/libbrcmEGL.so
lrwxrwxrwx 1 root root  /usr/lib/arm-linux-gnueabihf/libEGL.so.1.1 -> /opt/vc/lib/libbrcmEGL.so
lrwxrwxrwx 1 root root  /usr/lib/arm-linux-gnueabihf/libEGL.so.1 -> /opt/vc/lib/libbrcmEGL.so
lrwxrwxrwx 1 root root  /usr/lib/arm-linux-gnueabihf/libEGL.so -> /opt/vc/lib/libbrcmEGL.so
-rw-r--r-- 1 root root  /opt/vc/lib/libEGL.so
lrwxrwxrwx 1 root root  /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.1.0 -> /opt/vc/lib/libbrcmGLESv2.so
lrwxrwxrwx 1 root root  /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2.1 -> /opt/vc/lib/libbrcmGLESv2.so
lrwxrwxrwx 1 root root  /usr/lib/arm-linux-gnueabihf/libGLESv2.so.2 -> /opt/vc/lib/libbrcmGLESv2.so
lrwxrwxrwx 1 root root  /usr/lib/arm-linux-gnueabihf/libGLESv2.so -> /opt/vc/lib/libbrcmGLESv2.so

ldd myapp

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

And now the really strange part -> maybe this is a bug?
I can display the image (with mask, and dropshadow) itself.
But I can not load it as a delegate from a DelegateModel like following (this is when I see the open gl errors from above):

DelegateModel{      
    id: mydelegatemodel      
    model: kidmodel      
    delegate: RoundShadowIcon{      
        id: item      
        width: grid.cellWidth;      
        height: grid.cellHeight;      
    }      
}      
GridView{      
    clip: true      
    id: grid      
    anchors.fill: parent      
    cellWidth: 100      
    cellHeight: 100      
    model: mydelegatemodel      
}

RoundShadowIcon.qml:

import QtQuick 2.12
import QtGraphicalEffects 1.12

Item {
    Image {
        id: face
        source: "file:///usr/local/qt5pi/examples/myapp/cache/someimage.png"
        sourceSize: Qt.size(parent.width, parent.height)
        width: parent.width
        height: parent.height
        fillMode: Image.PreserveAspectCrop
        smooth: true
        visible: false
    }
    Rectangle{
        id: mask
        anchors.fill: parent
        radius: main.radius_
        visible: false
    }
    OpacityMask {
        id: round
        anchors.fill: face
        source: face
        maskSource: mask
    }
    DropShadow {
        id: shadow
        anchors.fill: parent
        horizontalOffset: 0
        verticalOffset: 0
        radius: 12.0
        samples: 17
        source: round
    }
}

Greetings
Thomas