Friday, June 17, 2016

How to cross-compile for RasPi3

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I am currently trying to cross-compile Qt 5.7 for my Raspberry Pi 3. This is my first cross-compiling atempt, so please be kind. :)

On the Qt Wiki I found instructions for the Raspberry Pi 2, which I am currently trying to adapt.

The compile line for RasPi 2 is as follows:

./configure -release -opengl es2 -device linux-rasp-pi2-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 -v 

I replaced the option

-device linux-rasp-pi2-g++ 

by

-device linux-rpi3-g++ 

as I found within the raspi-tools folder.

Now I am stuck at the option

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

as in the ~/raspi/tools/ folder I cannot see any obviously raspi3-related entry. There is only the arm-bcm2708/ folder. Shouldn't there be some bcm2837 entry? Does that mean there is no support for RasPi 3 yet or am I missing something?

Thank you for any hints.

1 Answers

Answers 1

The arm-bcm2708/ folder is just a name. It contains several build tool chains. It's perfectly fine to use system-installed tool chains as well. So I installed the package g++-arm-linux-gnueabihf on my build machine (Debian GNU/Linux) and used this configure call:

./configure -release -opengl es2 -device linux-rpi3-g++ \   -device-option CROSS_COMPILE=/usr/bin/arm-linux-gnueabihf- \   -sysroot /home/fs/raspi/sysroot -opensource -confirm-license \   -make libs -prefix /usr/local/qt5pi -extprefix /home/fs/raspi/qt5pi \   -hostprefix /home/fs/raspi/qt5 -v 
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