Compiling Qt5.14 for RaspberryPi4

[maxwell31]

Hi,

I am trying to cross compile Qt5.14 ( git clone git://code.qt.io/qt/qt5.git -b 5.14) for the RaspberryPi4. I saw that in https://code.qt.io/cgit/qt/qtbase.git/tree/mkspecs/devices there is already an entry for linux-rasp-pi4-v3d-g++.

I used Raspbian Buster installed via NOOBS to my raspberry, and mount the raspberry via sshfs to /opt/raspberry/sysroot/. In order to avoid problems with symbolic links I ran "sudo symlinks -cr ." in the root directory on my raspberry.

For the toolchain I used https://releases.linaro.org/components/toolchain/binaries/latest-7/arm-linux-gnueabihf/gcc-linaro-7.4.1-2019.02-x86_64_arm-linux-gnueabihf.tar.xz (which should work according to https://code.qt.io/cgit/qt/qtbase.git/tree/mkspecs/devices/linux-rasp-pi4-v3d-g++/qmake.conf)

This is the configure script I used:

./configure -release -opengl es2 -device linux-rasp-pi4-v3d-g++ -device-option CROSS_COMPILE=/opt/raspberry/gcc-linaro-7.4.1-2019.02-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-  -sysroot /opt/raspberry/sysroot -opensource -confirm-license -make libs -prefix /usr/local/qt5pi -extprefix /opt/raspberry/qt5pi -hostprefix /opt/raspberry/qt5pi_host -v

However, configure reports the following problem

ERROR: The OpenGL functionality tests failed!
You might need to modify the include and library search paths by editing QMAKE_INCDIR_OPENGL[_ES2],
QMAKE_LIBDIR_OPENGL[_ES2] and QMAKE_LIBS_OPENGL[_ES2] in the mkspec for your platform.

Thus, I tried to follow the suggestion on https://wlhe.github.io/2018/01/Build-Qt5.10-for-Raspberry-PI3 and set the following variables in tbase/mkspecs/devices/linux-rasp-pi4-v3d-g++/qmake.conf

VC_LIBRARY_PATH         = $$[QT_SYSROOT]/opt/vc/lib
VC_INCLUDE_PATH         = $$[QT_SYSROOT]/opt/vc/include

QMAKE_LIBDIR_OPENGL_ES2 = $${VC_LIBRARY_PATH}
QMAKE_LIBDIR_EGL        = $$QMAKE_LIBDIR_OPENGL_ES2
QMAKE_LIBDIR_OPENVG     = $$QMAKE_LIBDIR_OPENGL_ES2

QMAKE_INCDIR_EGL        = \
                        $${VC_INCLUDE_PATH} \
                        $${VC_INCLUDE_PATH}/interface/vcos/pthreads \
                        $${VC_INCLUDE_PATH}/interface/vmcs_host/linux
QMAKE_INCDIR_OPENGL_ES2 = $${QMAKE_INCDIR_EGL}
QMAKE_INCDIR_OPENVG     = $${QMAKE_INCDIR_EGL}

and I also tried setting the following links:

$ sudo ln -s libbrcmEGL.so libEGL.so
$ sudo ln -s libbrcmGLESv2.so libGLESv2.so
$ sudo ln -s libbrcmOpenVG.so libOpenVG.so
$ sudo ln -s libbrcmWFC.so libWFC.so

Still I get the same result.

[matzrm]

Hi,

did you have enabled fake kms driver through raspi-config?

[maxwell31]

What is KMS actually?

I just tried to compile with enabling it in raspi-config, but it does not make a difference.

[oniongarlic]

Read the full verbose log for the exact check that fails. Make sure you have all required development packages installed.

[matzrm]

Ok,
Start from scratch with the latest Raspian Image Light

Enable fkms, by raspi-config -> Advanced -> GL Driver.
Add more graphic memory (256 for examble) by raspi-config -> Advanced -> Memory Split

Install these packages:

# qtbase
sudo apt-get install libboost1.58-all-dev libudev-dev libinput-dev libts-dev libmtdev-dev libjpeg-dev libfontconfig1-dev libssl-dev libdbus-1-dev libglib2.0-dev libxkbcommon-dev libegl1-mesa-dev libgbm-dev libgles2-mesa-dev mesa-common-dev

# qtmultimedia
sudo apt-get install libasound2-dev libpulse-dev gstreamer1.0-omx libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev  gstreamer1.0-alsa

# qtwebengine
sudo apt-get install libvpx-dev libsrtp0-dev libsnappy-dev libnss3-dev

[maxwell31]

I installed the suggested libraries, but it does not change anything. Does it have something to do with this?
https://wiki.gentoo.org/wiki/Raspberry_Pi_VC4

[matzrm]

Have you enabled fmks driver?
Have you made a re-sync of the sysroot after have installed the plugins on the raspberry?
Are you started from scratch?Make a git clean -dfx before execute the configure command.

[maxwell31]

Hm, I might be mistaken, I guess installing the above libraries changed something. I will report more later

[maxwell31]

I succeeded in compiling Qt 5.14. After I compiled, I tried to cross compile a program for the Raspberry. This also worked, but when executing the program on the Raspberry I got a complaint that it could not find libQt5QuickControls2.so.5. I set LD_LIBRARY_PATH correctly, but in the lib directory, there are the Qt libraries but no library for QuickControls2. Do I need to set an option to build it? I also wonder how it was possible to compile if this library was missing

[maxwell31]

The problem was that cross compilation was successfull but make install had an error relating to qt3d, thus the quickcontrols2 dll did not get copied to the right directory