cross-compile Qt5 on RaspberryPi

• step by step by Beginner’s guide to cross-compile Qt5 on RaspberryPi

I got lots of problems as following,

• Fail => sudo apt-get install ia32-libs 

A:  sudo dpkg --add-architecture i386

  sudo apt-get update 
  sudo apt-get install ia32-libs

complier error

make[4]: *** [.obj/release-shared/qeglfshooks_pi.o] Error 1


make[4]: Leaving directory `/home/nathan/opt/qt5/qtbase/src/plugins/platforms/eglfs'


make[3]: *** [sub-eglfs-make_first] Error 2


make[3]: Leaving directory `/home/nathan/opt/qt5/qtbase/src/plugins/platforms'


make[2]: *** [sub-platforms-make_first] Error 2


make[2]: Leaving directory `/home/nathan/opt/qt5/qtbase/src/plugins'


make[1]: *** [sub-plugins-make_first] Error 2


make[1]: Leaving directory `/home/nathan/opt/qt5/qtbase/src'


make: *** [sub-src-make_first] Error 



A: http://qt-project.org/forums/viewthread/33587





Ok Solution:


type in root$ sudo find ~/opt -type f -exec grep -H ‘vc_dispmanx_element_change_attributes’ {} \;


Password: your_root_password


then it should find 2 locations


/Users/your_user_name/opt/qt5/qtbase/mkspecs/devices/linux-rasp-pi-g++/qeglfshooks_pi.cpp

and


/Users/your_user_name/opt/rasp-pi-rootfs/opt/vc/include/interface/vmcs_host/vc_dispmanx.h


First edit prototype of function in vc_dispmanx.h from:




VCHPRE_ int VCHPOST_ vc_dispmanx_element_change_attributes(DISPMANX_UPDATE_HANDLE_T 

update, DISPMANX_ELEMENT_HANDLE_T element, uint32_t change_flags, int32_t layer, uint8_t opacity, 

const VC_RECT_T *dest_rect, const VC_RECT_T *src_rect,

DISPMANX_RESOURCE_HANDLE_T mask, VC_IMAGE_TRANSFORM_T transform );




To:




VCHPRE_ int VCHPOST_ vc_dispmanx_element_change_attributes(DISPMANX_UPDATE_HANDLE_T 

update, DISPMANX_ELEMENT_HANDLE_T element, uint32_t change_flags, int32_t layer, uint8_t opacity, 

const VC_RECT_T *dest_rect, const VC_RECT_T *src_rect, DISPMANX_RESOURCE_HANDLE_T 

mask, DISPMANX_TRANSFORM_T transform );




Then Edit




/Users/your_user_name/opt/qt5/qtbase/mkspecs/devices/linux-rasp-pi-g++/qeglfshooks_pi.cpp

go to function moveDispmanxLayer and make sure it looks like this:




static void moveDispmanxLayer(EGLNativeWindowType window, const QPoint &pos)


{ 

   EGL_DISPMANX_WINDOW_T *eglWindow = static_cast<EGL_DISPMANX_WINDOW_T *>(window); 

   QSize size(eglWindow->width, eglWindow->height);

   VC_RECT_T dst_rect; 

   dst_rect.x = pos.x(); 

   dst_rect.y = pos.y(); 

   dst_rect.width = size.width(); 

   dst_rect.height = size.height(); 

   VC_RECT_T src_rect; 

   src_rect.x = 0; 

   src_rect.y = 0; 

   src_rect.width = size.width() << 16; 

   src_rect.height = size.height() << 16; 

   DISPMANX_UPDATE_HANDLE_T dispman_update = vc_dispmanx_update_start(0);

   vc_dispmanx_element_change_attributes(dispman_update, 

                                                                      eglWindow->element,

                                                                      ELEMENT_CHANGE_DEST_RECT /*change_flags*/, 

                                                                      0,

                                                                      0, 

                                                                      &dst_rect, NULL, 

                                                                      0, 

                                                                      (DISPMANX_TRANSFORM_T)0); 

   vc_dispmanx_update_submit_sync(dispman_update); 

}




Then recompile

install qt5 library at pi


A: http://ricky-tee.blogspot.tw/2013/03/running-qt5-cinematic-experience.html

   http://twolife.be/raspbian/
we have to modify twolife's Raspbian repository

deb http://twolife.be/raspbian/ wheezy main backports
deb-src http://twolife.be/raspbian/ wheezy main backports

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-key 2578B775



could not find xcb plugin



A:sudo apt get install libx11-xcb-dev 


bash: /home/pi/qaz: No such file or directory

     Application finished with exit code 127.

A: http://qt-project.org/doc/qtcreator-2.8/creator-deployment-maemo.html


But I found I can't succeed when setting as following at *.pro,


target.path = /home/pi

INSTALLS += target

When I create another folder at /home/pi, I can deploy and run it successfully 

target.path = /home/pi/test
INSTALLS += target

“The selected build of GDB does not support Python scripting.It cannot be used in Qt Creator.”


A:  sudo apt-get install gdb-multiarch

https://jeanleflambeur.wordpress.com/2014/09/28/remote-debugging-on-the-raspberry-pi-from-qtcreator/

http://sourceware.org/gdb/papers/multi-arch/whatis.html

DEBIAN 7 - Can't exec "locale": No such file or directory at /usr/share/perl5/Debconf/Encoding.pm

from:http://samonesoznanie.blogspot.tw/2014/09/debian-7-cant-exec-locale-no-such-file.html

DEBIAN 7
cause
Can't exec "locale": No such file or directory at /usr/share/perl5/Debconf/Encoding.pm line 16.
Use of uninitialized value $Debconf::Encoding::charmap in scalar chomp at /usr/share/perl5/Debconf/Encoding.pm line 17.
dpkg: `ldconfig' not found on PATH.
dpkg: 1 expected program(s) not found on PATH.
NB: root's PATH should usually contain /usr/local/sbin, /usr/sbin and /sbin.
E: Sub-process /usr/bin/dpkg returned an error code (2)
for fix

Download and extract the package

apt-get download libc-bin
dpkg -x libc-bin*.deb unpackdir/

Copy the file to your system

sudo cp unpackdir/sbin/ldconfig /sbin/

Make sure the package and package system is in a good state.

sudo apt-get install --reinstall libc-bin
sudo apt-get install -f

Futher errors after this indicates something else is wrong.