Can I build Qt own on Raspberry Pi ?

[Takeyuki]

Hello,

Because I don't have Linux PC, I've tried Qt build own on Raspberry Pi with following configure options:

./configure -release -opengl es2 -opensource -confirm-license -make libs -prefix /usr/local -v

I've expected that configure detect correct EGL type as "raspberry", but result is EGLFS Raspberry Pi . no as follows:

  Build parts ............  libs
  Mode ................... release
  Using sanitizer(s)...... none
  Using C++ standard ..... c++1z
  Using gold linker....... yes
  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 ................... yes
  Evdev .................. yes
  FontConfig ............. yes
  FreeType ............... yes (system library)
  Glib ................... yes
  GStreamer .............. yes (1.0)
  GTK theme .............. yes
  HarfBuzz ............... yes (bundled copy)
  Iconv .................. yes
  ICU .................... yes
  Image formats: 
    GIF .................. yes (plugin, using bundled copy)
    JPEG ................. yes (plugin, using system library)
    PNG .................. yes (in QtGui, using system library)
  libinput................ yes
  Logging backends: 
    journald ............... no
    syslog   ............... no
  mtdev .................. yes (system library)
  Networking: 
    getaddrinfo .......... yes
    getifaddrs ........... yes
    IPv6 ifname .......... yes
    libproxy.............. yes
    OpenSSL .............. yes (loading libraries at run-time)
  OpenGL / OpenVG: 
    EGL .................. yes
    OpenGL ............... yes (OpenGL ES 2.0+)
    OpenVG ............... no
  PCRE ................... system
  pkg-config ............. yes 
  PulseAudio ............. yes
  QPA backends: 
    DirectFB ............. no
    EGLFS ................ yes
      EGLFS i.MX6 ........ no
      EGLFS i.MX6 Wayland. no
      EGLFS EGLDevice .... yes
      EGLFS GBM .......... yes
      EGLFS Mali ......... no
      EGLFS Raspberry Pi . no
      EGLFS X11 .......... yes
    LinuxFB .............. yes
    Mir client............ no
    XCB .................. yes (system library)
      EGL on X ........... yes
      GLX ................ yes
      MIT-SHM ............ yes
      Xcb-Xlib ........... yes
      Xcursor ............ yes (loaded at runtime)
      Xfixes ............. yes (loaded at runtime)
      Xi ................. no
      Xi2 ................ yes
      Xinerama ........... yes (loaded at runtime)
      Xrandr ............. yes (loaded at runtime)
      Xrender ............ yes
      XKB ................ yes
      XShape ............. yes
      XSync .............. yes
      XVideo ............. yes
  Session management ..... yes
  SQL drivers: 
    DB2 .................. no
    InterBase ............ no
    MySQL ................ yes (plugin)
    OCI .................. no
    ODBC ................. yes (plugin)
    PostgreSQL ........... yes (plugin)
    SQLite 2 ............. yes (plugin)
    SQLite ............... yes (plugin, using bundled copy)
    TDS .................. yes (plugin)
  tslib .................. yes
  udev ................... yes
  xkbcommon-x11........... yes (system library)
  xkbcommon-evdev......... yes
  zlib ................... yes (system library)

Does anyone know how to set correct parameter's of configure for own compiling, thank you!

[Pablo J. Rogina]

@Takeyuki

I don't have Linux PC

What about using a VM with Linux installed? That way you could achieve cross-compilation of Qt in your "host" which will be faster that on the own device. In that case I'd suggest this guide just in case.

[Takeyuki]

@Pablo-J.-Rogina

Thank you for kindly nice suggestion! It seems good for me as a last resort.

If it is possible I'd rather do own compile because it's more simple than cross compile.
Also, Raspberry Pi 3 is enough power full, the make process of this is finished within 1 hour.
Unfortunately the completed Qt can't run well with EGL due to configure can't select Raspberry Pi EGL as correct. So, I'm looking for the way to select to correct EGL type. Any suggestion are welcome!

[Pablo J. Rogina]

@Takeyuki maybe this post can help regarding the EGLFS issue

[jsulm]

@Takeyuki said in Can I build Qt own on Raspberry Pi ?:

EGLFS Raspberry Pi . no as follows

Add -v parameter to configure call - it will show you more information about what exactly is missing

[Takeyuki]

@jsulm

Thank you for your suggestion.
I'm afraid I've use -v at the end of the configure script mentioned before...

[jsulm]

@Takeyuki But then there should be much more output than what you posted above.

[Takeyuki]

@jsulm

I've refer the post which is recommended by @Pablo-J.-Rogina, then add brcm specific libraries on /home/pi/qtbase/mkspecs/linux-g++/qmake.conf as follows:

#
# qmake configuration for linux-g++
#

MAKEFILE_GENERATOR      = UNIX
CONFIG                 += incremental
QMAKE_INCREMENTAL_STYLE = sublib

include(../common/linux.conf)
include(../common/gcc-base-unix.conf)
include(../common/g++-unix.conf)
load(qt_config)

QMAKE_INCDIR_OPENGL_ES2 = /opt/vc/include
QMAKE_LIBDIR_OPENGL_ES2 = /opt/vc/lib
QMAKE_LIBS_OPENGL_ES2   = -lbrcmGLESv2 -lbrcmWFC -lbrcmEGL -lbrcmOpenVG -lbrcmEGL

Then, configure as follows:

./configure -release -opengl es2 -opensource -confirm-license -make libs -prefix /usr/local -v

The result of configure is here.
The line #249 seems to indicate that expected libraries can be linked to opengles2

g++ -Wl,-O1 -o opengles2 opengles2.o   -lGLESv2 -L/opt/vc/lib -lbrcmGLESv2 -lbrcmWFC -lbrcmOpenVG -lbrcmEGL 
g++ -Wl,-O1 -o opengles3 opengles3.o   -lGLESv2 -L/opt/vc/lib -lbrcmGLESv2 -lbrcmWFC -lbrcmOpenVG -lbrcmEGL 
g++ -Wl,-O1 -o opengles31 opengles31.o   -lGLESv2 -L/opt/vc/lib -lbrcmGLESv2 -lbrcmWFC -lbrcmOpenVG -lbrcmEGL 
checking for eglfs-brcm... 
g++ -c -pipe -O2 -Wall -W -fPIC  -I. -I../../../mkspecs/linux-g++ -o eglfs-brcm.o eglfs-brcm.cpp

Then make, make_install, build qopenglwidget and run on the RPi, but result is still QXcbConnection: Could not connect to display

Are there any necessary steps which I've missed? Thank you for your suggestion!

[Pablo J. Rogina]

@Takeyuki said in Can I build Qt own on Raspberry Pi ?:

QXcbConnection: Could not connect to display

It looks like you don't have X11 service available in the device.

What if you try with:

./your-app -platform eglfs

[Takeyuki]

@Pablo-J.-Rogina

I've get strange error message...

./qopenglwidt -platform eglfs
Could not find DRM device!
Aborted