Compile QT 5.8 to cross-compile Beaglebone

Dario

Someone can explain me how can I compile Qt 5.8 for Beaglebone with the lasted image (Debian 8.7)?

SGaist

Hi,

Please search the forum a bit. There have been several post about that subject in the last months. e.g. this thread

Dario

@SGaist I've follow the post #13 of mzimmers, but i still cant develop an app using qt creator and qmake.
I don't know what I am doing bad.
Can you guide me how to setup?

regards

SGaist

What exact error are you getting ?

Dario

@SGaist I've do the next step based on http://blog.ventisei.eu/

https://docs.google.com/document/d/1wZSRiB23o-LMRMv039al9q8_ga7I1V7XrCfaT84smkM/edit?usp=sharing

The error that i get is:
Creating qmake...
........................................................................................Done.
Info: creating stash file /home/dario/Downloads/qt-everywhere-opensource-src-5.8.0/.qmake.stash
Info: creating super cache file /home/dario/Downloads/qt-everywhere-opensource-src-5.8.0/.qmake.super

Running configuration tests...
Checking for gold linker... no
Checking for valid makespec...
ERROR: Cannot compile a minimal program. The toolchain or QMakeSpec is broken.

Check config.log for details.

The config.log file is here
https://drive.google.com/file/d/0B4dS_vNgkiYAVVlidlVrTHo1NXM/view?usp=sharing

Can you help me?

SGaist

Please add the -v option to have more details about what is happening.

Also, you should do out of source build, so if something goes wrong you can just nuke the build folder and start anew.

mzimmers

Hi, SGaist and Dario -

I had to rebuild my Linux system from scratch recently, and am just now getting my cross-development tools working with the Beaglebone Black. I think I'm almost there...right now, when I attempt to debug, I get an error message from the target system: "Architecture rejected target-supplied description."

I've gone over my notes, and it doesn't seem like I encountered this before. The binary I build for the BBB does run (it's just hello world), so I'm wondering if the error message refers to the debugger I'm invoking? SGaist: any suggestions?

Once I have this working, I'll make an improved write-up of the necessary steps and post it in this thread.

SGaist

You are maybe using the wrong GDB to connect to your target.

mzimmers

Indeed I was. I can now debug hello world, though I am getting this warning when I start:

Could not load shared library symbols for 7 libraries, e.g. /lib/arm-linux-gnueabihf/librt.so.1.
Use the "info sharedlibrary" command to see the complete listing.
Do you need "set solib-search-path" or "set sysroot"?

It didn't affect this particular program, but I'd like to remedy this. Can you please remind me what needs to be done here? As I recall, it's something to do with sysroot, but I can't remember the details.

Thanks.

EDIT: I forgot to mention I also get this message at program startup:

stdin: is not a tty

Is this because I haven't allocated a terminal for the output of the debug session?

SGaist

I never got that one but I'd check the Kit for the sysroot related stuff.

That would make sense yes.

mzimmers

My BBB kit's sysroot is set to the one I downloaded from Linaro. Is there anything else I need to do? I don't copy it to the BBB, do I?

Andrey Shmelew

@mzimmers

Hi! Once you have compiled qt-creator 5.8. did you get .so libraries for BBB?
A mean libQt5Gui.so.5.8.0, libQt5Serial.so.5.8.0 etc... for BBB debian images.
what versions of .so libraries are installed now on your beaglebone black board?

mzimmers

@Andrey-Shmelew Compiling qt-creator does not give you those libraries. To get them, I believe you need to do a full build of Q for the BBB.

Andrey Shmelew

Ok!

Now i have on Windows host machine Qt creator 5.5.0, on BBB i have libraries *.so.5.3.2. How can I be sure that the application will work identiaclly on Windows Host machine and on Linux BeagleBone Board?

jsulm

@Andrey-Shmelew said in Compile QT 5.8 to cross-compile Beaglebone:

How can I be sure that the application will work identiaclly on Windows Host machine and on Linux BeagleBone Board?

Do you want to use your app on Windows and BBB?
To be sure it behaves the same you need to test on both.
To develop on Windows for BBB you need the Qt libs built for BBB on your Windows machine as well + cross compiler + sysroot.

Andrey Shmelew

@jsulm said in Compile QT 5.8 to cross-compile Beaglebone:

Do you want to use your app on Windows and BBB?

I want to use my application on BBB, but i want it develop and debug on Windows first.
I plan to develop multithread stable secutiy system based on BBB/Qt/QML. I already have the Qt libs built for BBB on your Windows machine as well + cross compiler + sysroot. But Qt libs was prebuilt. Now i can develop app on Windows and deploy it on BBB, but i am not sure it is the best way.

jsulm

@Andrey-Shmelew said in Compile QT 5.8 to cross-compile Beaglebone:

but i am not sure it is the best way

Why not? It is the usual way to develop for other devices. Personally I would prefer Linux as development machine, but it is doable on Windows as well.

Andrey Shmelew

@jsulm

You think i should ignore mismatches of libraries versions (*.so.5.3.2 against Qt creator 5.8.0) and keep going?

jsulm

@Andrey-Shmelew There is no QtCreator 5.8 - current version is 4.2.2.
QtCreator is not the same as Qt. QtCreator is an IDE, Qt is a C++ framework. You can use any Qt version with QtCreator. QtCreator version doesn't matter at all.
Or do you mean you have Qt 5.8 built for BBB on your Windows machine?

Andrey Shmelew

@jsulm
i have
on Host Windows 10:
Qt Creator 4.1.0
Based on Qt 5.7.0 (MSVC 2013, 32 bit)
Qt Creator has a Kit for BBB

on Host Windows 10:
GNU toolchaon for BeagleBone, GCC version 4.9.2 (libs, compiler, gdb debugger, sysroot)