QT5.2.x crosscompile general advice

ben80

Hi everyone,

i'm trying to cross-compile QT5.2 for my raspberry, like most of you do ;-)
I need some general advice.

What I've done:

I already have raspbian configured and running and don't want to change it anymore (if possible)
I'm following the steps described in http://qt-project.org/wiki/RaspberryPi_Beginners_guide

Question:
What do i have to do differently so that i can:

crosscompile and install QT on my host linux, e.g. to one folder. The beginners guide somehow merges the compiled QT file into a wheezy image. But i want to keep my existing raspbian system
copy that folder to my raspberry and run a qt-programm

My System:

raspberry: NOOBS - raspbian image
Host: Linux Debian (downloaded the newest version via net-installer; i don't know which version exactly)

Thanks a lot for your help,
ben

ben80

Hi Mindstomer,

actually i don't mind any more to use a fresh raspbian installation. If it keeps me from more headache, then that's the way to go.

bq. I followed it as well and I got it working after pulling a few hairs.

Ok, that's the interesting part now.

Which parts did you follow exactly and which did you have to change? Even if the changes were small.
Any other steps you needed to do, which is not explained in the guide?
Did you follow the guide itself or did you use the script "bakeqtpi.bash"?

bq. Not all modules in the guide will work

Can you tell me which ones won't work?
What about QtQuick or qmlviewer/qmlscene?

Thanks a lot for your help. Would be great if i could finally built it.
Ben

ben80

Hi Mindstormer,

thanks so much. That were exactly the hints i needed.

I used the latest rasbpian image
I didn't use the bakeqt.bash script
I didn't use the patch

Now, i could successfully run the QTquick example, which i cross-compiled on my host-pc with qtcreator.

There are still a few things i'm stuck with, so you might be able to help with those as well:

qmlviewer/qmlscene don't come with the normal download of the qt5 binaries, right? Where do i get them?
Some qt5 module folders were empty, that was the same for you, right? But, the folder qtjsbackend doesn't exist at all. Same for you?
Weird: i can compile and run a qtquick hello world programm on my raspberry, but cannot compile it for my debian host desktop:
/mnt/rasp-pi-rootfs/usr/local/qt5pi/include/QtGui/qopengl.h:82: Fehler: GLES2/gl2.h: No such file or directory
How can i automatically mount the RPI image at the start of my debian host?
What's the entry in /etc/fstab for the following mount command:
sudo mount -o loop,offset=62914560 2014-01-07-wheezy-raspbian.img /mnt/rasp-pi-rootfs
Where do i have to enter the following command from the beginners tutorial. I cannot find the edit field in QTcreator

Then go to the “Rasperry Pi” kit tab->System Environment and add LD_LIBRARY_PATH which is set to /usr/local/qt5pi/lib

Thanks so much again for your help,
Ben

ben80

Hi Mindstormer,

it now works for me well enough, to keep it that way. ;-)
I still cannot run an application on the desktop AND on the raspberry pi. I have to build two different apps for it.
I thought that's one of the big advantages of QT that i can create a qml app and run it on the desktop. When it's finished i would deploy it to my raspberry, simple by changing the kit?!

Thanks anyway, Ben