Qt on Raspberry pi3

sierdzio

tforms/eglfs/deviceintegration/eglfs_kms/qeglfskmsgbmmain.cpp -o .moc/qeglfskmsgbmmain.moc
Makefile:2849: recipe for target '.obj/qeglfskmsgbmwindow.o' failed

That's not the error message. Please look before it for the real cause of the compilation fail - and post it here.

EGLFS Raspberry Pi ................... no

You may want to check out -device linux-rasp-pi3-g++-vc4, it uses the GPU from on RPi. Note however, that your RPi sysroot needs to be up to date for Qt to find dependencies there.

chek

I'm also having issues cross compiling qt 5.11.0 for rpi3, has this been solved?

sierdzio

Well, compilation works for 5.10, 5.9 - they simply compile and work. With Qt 5.11.1, I've just tried and there seems to be a bug in QGeoMap.

If you want to try with 5.10:
You have to set up your toolchain and sysroot correctly, though. Follow the guide https://wiki.qt.io/RaspberryPi2EGLFS and you should be fine.

Remember to get all the dependencies and to run the symlink fix afterwards. You may throw in some extra libs just to be sure:

sudo apt build-dep qt5-default qt5-qmake
sudo apt install libiconv-hook-dev libinput-dev libts-dev bluez libbluetooth-dev libgstreamer1.0-dev libegl1-mesa

# Optionally if it somehow still does not work:
sudo apt install "^libxcb.*" libx11-xcb-dev libglu1-mesa-dev libxrender-dev libatspi2.0-dev libdbus-1-dev

And turn on OpenGL driver in raspi-config,

Here is my compilation script, if it helps:

export QTVER=5101
wget https://download.qt.io/official_releases/qt/5.10/5.10.1/single/qt-everywhere-src-5.10.1.tar.xz
tar -xaf qt-everywhere-src-5.10.1.tar.xz
mv qt-everywhere-src-5.10.1 $QTVER-src
cd $QTVER-build

../$QTVER-src/configure -release -opengl es2 -device linux-rasp-pi3-vc4-g++ \
-device-option CROSS_COMPILE=/path/to/toolchain/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf- -sysroot /path/to/sysroot \
-opensource -confirm-license -make libs -no-use-gold-linker \
-prefix /home/pi/qt/$QTVER -extprefix /path/to/qt-pi/$QTVER \
-hostprefix /path/to/$QTVER-qmake \
-skip qtserialbus -skip qtscxml -skip qtscript -skip qtcharts -skip qt3d \
-skip qtdatavis3d -skip qtcanvas3d -skip qtgamepad -skip qtvirtualkeyboard \
-skip qtwayland -skip qtwebengine -skip qtwebchannel -skip qtwebglplugin \
-skip qtwebsockets

make -j 8

make install

chek

@sierdzio
Thank you so much for the reply, I think i'm also seeing the issue with qgeomap when doing 'make install' for 5.11.0. I'm trying to build qgroundcontrol for the raspberry and apparently it needs 5.11.0.
Do you know a solution for the qgeomap bug?

sierdzio

@chek said in Qt on Raspberry pi3:

@sierdzio
[...]
Do you know a solution for the qgeomap bug?

Not yet, but I will check it out.

I don't see it reported on Qt bugtracker yet.

chek

Hi, I've compiled 5.10.1 for the pi and it works, but when I try to open the qt-project qt-creator complains about my compiler: Unsuported Linux toolchain, only GCC 32- or 64-bit is supported.
I'm using "gcc-linaro-5.5.0-2017.10-x86_64_arm-linux-gnueabihf"
Do you know what this could be?

sierdzio

Have you added the linaro compiler in Qt Creator's settings?

chek

Yes,I've created a rpi kit, where I've added a gcc compiler for C and C++ which points to the linaro compiler I used when compiled the qt sources

sierdzio

Hm so it should work. Please check if the kit really points to your cross-compiled Qt. I've made a mistake of not checking that many times already :D And Qt Creator seems to auto-set the Qt version wrongly sometimes.

ronpetit

@sierdzio I successfully compile Qt 5.10.1 on my raspberry pi 3 using the device "linux-rasp-pi3-vc4-g++", however, after activating the OPENGL driver on raspi-cofnig, when running the qopenglwidget example, it shows the error "Failed to create service, already in use?", I checked on the internet and everybody suggest to disable the vc4 drivers to get rid of the error, however, if I do that the eglfs will complain that it cannot find any GBM, and indeed, I compile it to use those drivers, any idea how can I fix that?

sierdzio

Do you have X server running (Raspbian GUI) when you launch the example? If so, don't. Start the app directly from command line, without the X server. Not sure if it will help, but maybe.

I have not encountered that error myself.

ronpetit

@sierdzio I'm running it without X server, as I should

Now, I'm curious about this, what libs are you using for glesv2 and egl?, I'm using the ones in /opt/vc/lib folder, and I also cross compiled the Qt with those

sierdzio

@ronpetit said in Qt on Raspberry pi3:

@sierdzio I'm running it without X server, as I should

Now, I'm curious about this, what libs are you using for glesv2 and egl?, I'm using the ones in /opt/vc/lib folder, and I also cross compiled the Qt with those

Oh I don't remember to be honest. I think I didn't change anything from stock settings. I also didn't specify the OpenGL libs manually anywhere when building Qt or apps.