Cross compilation with X11

SGaist

What you did is install the dependencies to build Qt for your computer. What you need to do is install them for your target. So the simplest way is to login to your target, install all the needed dependencies.

The you can e.g. mount your device filesystem in a place on your computer using e.g. sshfs and give the -sysroot parameter to configure pointing to where your mounted the device fs. It should then pick the headers and libraries from there and continue its work

ChaitraMohan

Hi,

I successfully cross compiled Qt source using sysroot.
Thank you so much.

I have one more problem.
I created a sample application and tried to compile it.
As it was not accessible for the sysroot or something else I was unable to build my QT application in the Qt creator.

I got the following error:
@cc1plus: error: /media/SSHFS_X11/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/install/arm-linux-gnueabihf/libc/include: Permission denied
cc1plus: error: /media/SSHFS_X11/usr/include/.: Permission denied
cc1plus: error: /media/SSHFS_X11/usr/include/arm-linux-gnueabihf: Permission denied
cc1plus: error: /media/SSHFS_X11/usr/include: Permission denied@

I tried to make changes in Tools->Options->Build and Run->Kits->sysroot I tried to include the mounted file system, but it was blank and nothing I could include it from my mounted file system SSHFS_X11.

Can I know what I need to do now? Please help me to resolve this issue.

Thank you.

SGaist

Did you check that you have read rights on you mounted file system ? Also did you mount it to the same place you used when cross-compiling Qt ?

ChaitraMohan

Hi,
Yes I have mounted on the place as I had while cross compiling.

I have permission to read/write but as a root. Its as shown below:
@drwxr-xr-x 2 root root 4096 Jun 11 2013 cdrom
drwxrwx--- 2 root vboxsf 4096 Jun 12 2013 sf_UbuntuSharedFolder
drwxr-xr-x 1 root root 4096 Oct 6 11:28 SSHFS_X11@

ChaitraMohan

Hi,

I resolved that issue. The problem was while mounting the file system using ssfhs I had not provided an option i.e allow_other. So it was showing permission denied error
Thank you.

ChaitraMohan

Hi,

All my problem solved. Now Qt application is running on gnome.
Thank you so much for the help :) :)

SGaist

You're welcome !

Since you have your application working now, please update the thread title prepending [solved] so other forum users may know a solution has been found :)

ChaitraMohan

Hi,

Ya sure I will do it.
I have one more problem. Keyboard is not working after running the application.
How can I enable it?

SGaist

How are you starting your application ? What type of keyboard is it ?

ChaitraMohan

I am using USB Keyboard.
I am starting the application by giving the command in the terminal:
@./Test_app@

Keyboard works till application runs after application start running it doesn't work.

SGaist

Still using X11 ?

ChaitraMohan

Yes Qt application running on X11.

thanga

@SGaist
Hi, I have followed same steps. It's works.
Is it possible build without target device ?
Could you please help me on this. Thanks in advance!

jsulm

@thanga said in [SOLVED]Qt cross compilation with X11:

Is it possible build without target device ?

Can you explain what you mean?
You can build without target device if you have a sysroot for it.

thanga

@jsulm

I have mounted target device on /media/SSHFS_X11/ path on host machine (Ubuntu). While mounted Qt getting build, If I disconnect the target device. I am getting following error:
Basic XLib functionality test failed!
You might need to modify the include and library search paths by editing
QMAKE_INCDIR_X11 and QMAKE_LIBDIR_X11 in /home/lolveley/bin/qt-x11-opensource-src-4.5.1/mkspecs/linux-g++.

May I know how to build without target device ? And how to configure sysroot on host (Ubuntu) machine ?

Could you please help me on this...

jsulm

@thanga Just create a directory and copy the content of your target device to that directory. Then use this directory as your sysroot instead of /media/SSHFS_X11.

thanga

@jsulm
I have copied /usr dir files to /media/SSHFS_X11, and tried to build But still and getting following error,
Basic XLib functionality test failed!
You might need to modify the include and library search paths by editing
QMAKE_INCDIR_X11 and QMAKE_LIBDIR_X11 in /home/lolveley/bin/qt-x11-opensource-src-4.5.1/mkspecs/linux-g++.

Is it required to copy all the contents or /usr dir is fine?

Target device also Ubuntu OS stand alone device.

jsulm

@thanga You need to copy everything what is needed. You should copy at least /usr/lib and /usr/include, probably /lib as well.
It should then look like:

/media/SSHFS_X11/usr/include
/media/SSHFS_X11/usr/lib
/media/SSHFS_X11/lib

Call configure with -v parameter to see what exactly is missing if it says "Basic XLib functionality test failed!".

SGaist

If you don't use the same folder as you did when configuring the first time then you should point configure to the new location. Note that you should do a build from scratch to avoid any leftovers from interfering.

thanga

@jsulm
I have copied /usr/lib, /usr/include and /lib files to /media/SSHFS_X11/. I am getting following error now,

/media/SSHFS_X11/usr/include/./X11/Xlib.h:38:23: fatal error: sys/types.h: No such file or directory
compilation terminated.
make: *** [xlib.o] Error 1
XLib disabled.
Basic XLib functionality test failed!
You might need to modify the include and library search paths by editing
QMAKE_INCDIR_X11 and QMAKE_LIBDIR_X11 in /home/user/qt-everywhere-opensource-src-4.8.6/mkspecs/qws/linux-arm-linaro-g++.