Talk:RaspberryPi2EGLFS

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I got this error in make step


qeglfsbrcmintegration.cpp:35:22: fatal error: bcm_host.h: No such file or directory 

#include <bcm_host.h>


compilation terminated.

make[6]: *** [.obj/qeglfsbrcmintegration.o] Error 1

make[6]: Leaving directory `/home/hamed/raspi/qtbase/src/plugins/platforms/eglfs/deviceintegration/eglfs_brcm'

make[5]: *** [sub-eglfs_brcm-make_first] Error 2

make[5]: Leaving directory `/home/hamed/raspi/qtbase/src/plugins/platforms/eglfs/deviceintegration'

make[4]: *** [sub-deviceintegration-make_first-ordered] Error 2

make[4]: Leaving directory `/home/hamed/raspi/qtbase/src/plugins/platforms/eglfs'

make[3]: *** [sub-eglfs-make_first] Error 2

make[3]: Leaving directory `/home/hamed/raspi/qtbase/src/plugins/platforms'

make[2]: *** [sub-platforms-make_first] Error 2

make[2]: Leaving directory `/home/hamed/raspi/qtbase/src/plugins'

make[1]: *** [sub-plugins-make_first] Error 2

make[1]: Leaving directory `/home/hamed/raspi/qtbase/src'

make: *** [sub-src-make_first] Error 2

hamed@hamed-PC ~/raspi/qtbase $

I edited this topic to add the solution to this error (fatal error: bcm_host.h: No such file or directory)

to solve this problem just add these lines

INCLUDEPATH += $[QT_SYSROOT]/opt/vc/include

INCLUDEPATH += $[QT_SYSROOT]/opt/vc/include/interface/vcos

INCLUDEPATH += $[QT_SYSROOT]/opt/vc/include/interface/vcos/pthreads

INCLUDEPATH += $[QT_SYSROOT]/opt/vc/include/interface/vmcs_host/linux

to these two files: "qtbase/mkspecs/devices/linux-rasp-pi-g++/qmake.conf"

and:

"qtbase/mkspecs/devices/linux-rasp-pi2-g++/qmake.conf"

after save the files repeat these two steps "configure" and "make"

the refrence is this thread



Different error in the make step http://stackoverflow.com/questions/34685488/qt-5-6-cross-compile-for-raspberry-pi-with-eglfs

QT Serial Port install in cross-compile environment

I am attempting to adapt the instructions linked here: Qt Serial Port to this cross-compile environment. The Qt Serial Port page suggests that Qt Serial Port is included in Qt5, however I cannot seem to find it. Has it been removed? I am running QT 5.4.2. on my host system.

If I have to install Qt Serial Port, then I am not sure how to successfully install it in this cross-compile environment. Can anyone help with this? Thank you!

Prerequisites to run cross compile tools on fresh Ubuntu/Debian x64

To run the tools on a host running Ubuntu / Debian x64, the following libraries are necessary:

$ sudo apt-get install lib32stdc++6 lib32z1 lib32ncurses5

Otherwise, errors like this might occur: 

arm-linux-gnueabihf-g++: Command not found

or 

arm-linux-gnueabihf-g++: Kommando nicht gefunden

--Woehrl.biz (talk) 08:06, 26 April 2016 (UTC)

X C Bindings

I had to add the following parameter to the configure command:

-qt-xcb

Otherwise the following error is shown:

The test for linking against libxcb and support libraries failed!
 You might need to install dependency packages, or pass -qt-xcb.
 See src/plugins/platforms/xcb/README.

--Woehrl.biz (talk) 09:42, 26 April 2016 (UTC)

Illegal instruction

I just set up a fresh Ubuntu 14.04 and RPiZero Raspbian.

I followed this tutorial and everything worked (after using the discussion page fixes) except for the example.

I built the example without errors, deployed it, set up the libraries, etc.

When I run the example on the Pi I simply get "Illegal Instruction". Nothing else.

I turned on logging and don't see the log output anywhere that I can find.

EDIT: I don't know if you just want me to delete this. I found the problem. I was building for the pi2 and trying to run it on the pi zero. Sorry about that. I am new to this stuff. I figured out how to build for pi 1 / zero and now everything works. This is awesome!!!

libinput not detected by configure script

Hi. In this excellent tutorial it is said that one must make sure that libinput is set to "yes" in configure's summary report.

I have libinput installed, and the library files and headers are in the sysroot path as required. Yet configure does not detect it. Even when I add the -libinput argument to the configure command line.

The test widget however compiles and runs fine on my Pi2.

Is libinput really required, and why?

Thanks!

could not find or load the Qt platform plugin "eglfs"

After following the tutorial, when running qopenglwidget I get the following error:

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

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

Reinstalling the application may fix this problem. Aborted

Since we are going to build Qt5 for Pi, I don't really get why one must INSTALL certain modules of Qt BEFORE the build?

Initial

Hi.

I just tried this tutorial on a Raspberry Pi 3, and encountered the following problem: 

pi@raspberrypi:~ $ sudo apt-get build-dep libqt5gui5
Reading package lists... Done
Building dependency tree
Reading state information... Done
Picking 'qtbase-opensource-src' as source package instead of 'libqt5gui5'
The following packages have unmet dependencies:
libgles2-mesa-dev : Depends: libegl1-mesa-dev but it is not going to be installed
libopenvg1-mesa-dev : Depends: libegl1-mesa-dev but it is not going to be installed
E: Build-dependencies for libqt5gui5 could not be satisfied.

Any hints?

Thanks, OJ

Greetings to all from Argentina. I'm trying to install this OpenGL accelerator I have a compilation with lots of errors how can I upload the text file with the screen output? They are many pages of text.

Thank you very much.

small fix to the relativelink fixing script

The script relinks also systemd files pointing to /dev/null. Although this does not break anything currently, here is a fix Copy the following and paste to shell in the directory where the sysroot-relativelinks.py is 

patch <<'EOF'
*** sysroot-relativelinks.py~	Fri Apr 28 09:50:57 2017
--- sysroot-relativelinks.py	Fri Apr 28 10:56:27 2017
***************
*** 18,23 ****
--- 18,25 ----
          return
      if link.startswith(topdir):
          return
+     if link.startswith("/dev/"):
+         return
      #print("Replacing %s with %s for %s" % (link, topdir+link, filep))
      print("Replacing %s with %s for %s" % (link, os.path.relpath(topdir+link, subdir), filep))
      os.unlink(filep)
EOF

Ansible Roles/Playbooks Based on this Article

I used the instructions here to make Ansible playbooks that perform most of the same steps. The playbooks can set up a Pi, set up a development computer, and then deploy Qt to the Pi. Repo is https://bitbucket.org/johnwoltman/build_qt_for_pi_with_ansible

Minor improvement to step 8

You can combine all 5 commands into one like this: 

rsync -avzR pi@raspberrypi.local:/lib :/usr/include :/usr/lib :/opt/vc sysroot

Note that -R preserves the path names and that rsync creates the ./sysroot directory for us.

Hi I have Ubuntu 16.04 x64 and Qt Creator 5.10.1 x64 witch version of qt base should I choose? for compile on raspberry pi 3 with Raspbian stretch x32 OS?

Recommended changes to step 11

the first command in step #11 should be 

  cd ..

This is because the previous step ends with you in qtbase when you need to be in raspi

Recommended changes to Step #15

Just including the line: 

  ./qopenglwidget

So that way beginners (like me) know what to do to get it running.

Suggestion of changes to step 14

Make sure you're in "/home/pi" aka "~" when you run these commands:

(This would have saved me an hour...)


Step #15 Problems

You may get this result when you run the example app: 

  This application failed to start because it could not find or load the Qt plaform plugin "xcb" in "".
  Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb.

  Reinstalling the application may fix this problem
  Aborted

Additional Debugging gives you this result: 

  Got keys from plugin meta data ("xcb")
  QFactoryLoader::QFactoryLoader() checking directory path "/home/pi/platforms" ...
  Cannot load library /usr/local/qt5pi/plugins/platforms/libqxcb.so: (/usr/local/qt5pi/plugins/platforms/../../lib/libQt5XcbQpa.so.5: symbol_ZTI18QPlatformClipboard, version Qt_5_PRIVATE_API not defined in file libQt5Gui.so.5 with link time reference)
  QLibraryPrivate::loadPlugin failed on "/usr/local/qt5pi/plugins/platforms/libqxcb.so" : "Cannot load library /usr/local/qt5pi/plugins/platforms/libqxcb.so: (/usr/local/qt5pi/plugins/platforms/../../lib/libQt5XcbQpa.so.5: symbol _ZTI18QPlatformClipboard, version Qt_5_PRIVATE_API not defined in file libQt5Gui.so.5 with link time reference)"
  This application failed to start because it could not find or load the Qt platform plugin "xcb" in "".

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

  Reinstalling the application may fix this problem.
  Aborted

No solution at this time.

Cross compilation on 64bit machines TIP

Hi. When You try to build QT on 64 bit PC without i386 libraries, use: 

  ~/raspi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf-

Never script your Terminal output to a .log file.

The title sums it all up. I began scripting the whole Terminal output to my progress.log file. I followed all steps up until the long ./configure command. It always failed while the compiler was searching for "~/raspi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-g++". The error was:

> Info: creating stash file /home/nikilesh/raspi/qtbase/config.tests/.qmake.stash > Project ERROR: Compiler ~/raspi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-g++ not found. Check the value of CROSS_COMPILE -device-option >Note: Also available for Linux: linux-clang linux-icc

>ERROR: Cannot compile a minimal program. The toolchain or QMakeSpec is broken.

I lost more than four hours finding out the solution, creating a totally separate folder, re-cloning tools from raspberrypi's git, re-cloning qtbase and then again failing thrice with the ./configure command. This was mildly infuriating. A brainwave occurred that made me exit from scripting my .log file. I executed the command simply in plain Terminal and succeeded in it. I recommend everyone who are keen to log their cross-compilation progress to use the "tee" command.

For example, <your command> | tee <file destination>

> $ ./configure -release -opengl es2 -no-openssl -no-dbus -no-use-gold-linker -device linux-rasp-pi3-g++ -device-option CROSS_COMPILE=~/raspi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf- -sysroot ~/raspi/sysroot -opensource -confirm-license -make libs -prefix /usr/local/qt5pi -extprefix ~/raspi/qt5pi -hostprefix ~/raspi/qt5 | tee ~/config_progress.log

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