Installation QT 5.11 on Raspberry Pi 3

[sierdzio]

To add to what @ambershark has said, here is the cross compilation guide for Raspberry Pi: https://wiki.qt.io/RaspberryPi2EGLFS

One thing to note: Qt 5.11.1 did not compile on RPi at all (a bug in Qt). I'm not sure if it was fixed in Qt 5.11.2, but if not you'll see some compilation error complaining about QGeoSomething (can't remember the exact class name, sorry).

[gogoer]

Yes i want to configure and compile it on RPI3 natively.

i deleted crosscompile option and have next configuration error:

+ g++ -dumpmachine
> arm-linux-gnueabihf
Checking for valid makespec... 
+ cd /home/pi/opt/qt5/build/config.tests/verifyspec && /home/pi/opt/qt5/build/qtbase/bin/qmake "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared use_gold_linker warn_off console single_arch" -early "CONFIG += cross_compile" /home/pi/opt/qt5/qt-everywhere-src-5.11.2/qtbase/config.tests/verifyspec
> Project ERROR: CROSS_COMPILE needs to be set via -device-option CROSS_COMPILE=<path>
Note: Also available for Linux: linux-clang linux-icc

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

[sierdzio]

Use linux-g++ mkspecs instead of the Raspberry Pi one when you compile natively. Start with only qtbase and expect a lot of issues to solve along the way, especially in more complex modules.

[gogoer]

is there any version of qr >5.10 that compiles normally on raspberry pi?
i need to compile a little project with some gauges. Now i do it on qt5.3 wich goes with RPI in QTCreator. But i cant use QTQuickQontrols 2.3 there.

[sierdzio]

@gogoer said in Installation QT 5.11 on Raspberry Pi 3:

is there any version of qr >5.10 that compiles normally on raspberry pi?

No idea.

qtbase usually compiles natively without issues. But it's definitely not checked regularly, as it is a niche use case. Last time I compiled qtbase + qtquick natively was around Qt 5.8 or 5.9 IIRC. It required some tweaking around OpenGL support. Maybe newer versions work, too, I don't know.

[gogoer]

@sierdzio said in Installation QT 5.11 on Raspberry Pi 3:

Start with only qtbase

sorry, but what this means?

[sierdzio]

@gogoer said in Installation QT 5.11 on Raspberry Pi 3:

@sierdzio said in Installation QT 5.11 on Raspberry Pi 3:

Start with only qtbase

sorry, but what this means?

Qt is comprised of many repositories, which contain modules inside. qtbase is the most basic repo, and contains QtCore, QtGui, QtNetwork and some other stuff.

If you want to compile only qtbase, you have 3 options:

• if you are using git repos, you need to call the init_repository script and specify qtbase only. More info: guide
• if you are using Qt tarballs (I recommend this solution), you can simply remove all forlders apart from qtbase from the uncompressed tarball
• you can also pass -skip qtmodulename to configure, but that would require you to pass all the modules apart from those found in qtbase... that's a lot of typing

Then you just run configure as usual.

[sneubert]

hi @gogoer
Just one side note. I periodically cross-compile qt with all working modules for rpi. This is done on a HP Z440 with 8 cores an 16GB RAM. The compilation takes about 2 hours.
But even if you just compile qtbase, prepare for a long long time to wait, way longer than set up the cross-toolchain on a desktop.

[gogoer]

what folders i need to leave if i want only use basecal QT, QTQuick and QTQuickControls 2.3 and QML.

[sierdzio]

@gogoer said in Installation QT 5.11 on Raspberry Pi 3:

what folders i need to leave if i want only use basecal QT, QTQuick and QTQuickControls 2.3 and QML.

• qtbase
• qtdeclarative
• qtquickcontrols2

Optionally:

• qtsvg
• qttools
• qtx11extras
• qtgraphicaleffects
• qtmultimedia

[gogoer]

@sierdzio said in Installation QT 5.11 on Raspberry Pi 3:

Use linux-g++ mkspecs instead of the Raspberry Pi one when you compile natively.

what i need to do?

i deleted folders, except your list.
now i use config string:

../qt-everywhere-src-5.11.2/configure -v -opengl es2 -eglfs -no-gtk -device linux-rasp-pi-g++ \
-opensource -confirm-license -reduce-exports \
-force-pkg-config -nomake examples -no-compile-examples -release \
-qt-pcre -ssl -evdev -system-freetype -fontconfig -glib -prefix /opt/qt5

but i have error:

Cannot compile minimal program. The toolchain or QMakeSpec is broken.

[sierdzio]

@gogoer said in Installation QT 5.11 on Raspberry Pi 3:

-device linux-rasp-pi-g++

Remove that, it should be enough.

If not, you can specify the mkspecs using this flag:

configure -platform linux-g++

[gogoer]

Thank you!
configuration is successfull.
i start compilation by

make -j 4

and it compiles about an hour, then gives error:

make[3]: Leaving directory '/home/pi/otp/qt5/build/qtbase/src/testlib'
make[2]: Leaving directory '/home/pi/otp/qt5/build/qtbase/src'
Makefile:48: recipe for target 'sub-src-make_first' failed
make[1]: *** [sub-src-make_first] Error 2
make[1]: Leaving directory '/home/pi/otp/qt5/build/qtbase'
Makefile:52: recipe for target 'module-qtbase-make_first' failed
make: *** [module-qtbase-make_first] Error 2

what i can do to solve this?

[sierdzio]

That output does not give details about any errors. Run make (without -j) and / or look for real error in the output (something coming from either linker or the compiler).

[gogoer]

it gives

g++: internal compiler error: Segmentation fault (program cc1plus) 
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.9/README.Bugs> for instructions.

and after gives error i write upper.

[sierdzio]

Whoa, that I have not seen before. Perhaps try with some older Qt release, maybe it won't trigger the compiler error. Also, disable tests as it seems to happen in test lib (-nomake tests -nomake examples).

[sierdzio]

Also, as @sneubert suggests, cross compilation will allow you to build much, much faster.

[mranger90]

@gogoer said in Installation QT 5.11 on Raspberry Pi 3:

g++: internal compiler error: Segmentation fault (program cc1plus)

That might be an out of memory error. I used to see that when I tried to build Qt in a VM that was not given enough memory.

[gogoer]

@sierdzio said in Installation QT 5.11 on Raspberry Pi 3:

Also, as @sneubert suggests, cross compilation will allow you to build much, much faster.

maybe you can give link to manual, how crosscompile QT from windows? i have not linux machine now.
i found only manuals to crosscompile from linux.

[sierdzio]

@gogoer said in Installation QT 5.11 on Raspberry Pi 3:

maybe you can give link to manual, how crosscompile QT from windows?

You like making things harder for yourself, right? ;-) There is this guide but it's known to work for a very limited range of Qt versions only.

A much better option is to set up some Linux OS (in a virtual machine or as dual boot on your PC) and cross compile via Linux. It's really much easier to do (which does not mean it is easy...). Installing a Linux distro like Ubuntu takes 20 minutes.