KDE on scratchbox for maemo 4

Revision as of 07:33, 13 January 2010

This article describes how to compile KDE for maemo. It takes the Nokia N810 as example device. It uses the cross-compiling environment scratchbox on an Intel-based computer.

1 Overview
2 On the Nokia itself
3 On your desktop
4 See also

Overview

maemo is the core software stack that runs on mobile devices like Nokia's N810 or N900
garage is where the projects for maemo are hosted, somewhat compareable to Sourceforge.
OS2008 is maemo 4.x (more info). Compare it with Debian's Lenny.
Diablo is the version (feature upgrade 2008) of maemo.
Scratchbox is a cross-compiling environment to enable you to create software for maemo on an i386.
Busybox is a single binary that allows you to run commands like ls, cat and bunzip2
Hildon is an application framework and desktop shell for maemo, compare it to the role that Plasma plays in KDE 4

On the Nokia itself

install openssh on the Nokia N810
install subversion

ssh root@localhost
apt-get install subversion

On your desktop

You cannot install scratchbox on an X64 computer, so, install an i386 into a VMWare virtual machine. The following describes how to install scratchbox into a SUSE 11.1 32bit installation. It might work same or similar with any Linux.

Set up scratchbox

First, we want to compile a "hello world" program for the Nokia. Here is how.

Set up VMWare Server 2.0
Install a virtual machine into VMWare Server, 40GB hard drive, 1024 GB RAM
Install SUSE Linux 11.1 from DVD. At the bootscreen, type F7 and select X86 instead of X86_64. That way, you will get a 32bit operating system.
Take a VMware SNAPSHOT from your virtual machine so you can revert to this state
Boot your virtual machine
Set up scratchbox

root@i386 # useradd -m scratchboxuser
root@i386 # passwd scratchboxuser
root@i386 # wget http://repository.maemo.org/stable/diablo/maemo-scratchbox-install_4.1.2.sh
root@i386 # chmod 777 maemo-scratchbox-install_4.1.2.sh
root@i386 # ./maemo-scratchbox-install_4.1.2.sh -s /scratchbox
root@i386 # /scratchbox/sbin/sbox_adduser scratchboxuser
root@i386 # su - scratchboxuser

set up the SDK

scratchboxuser@i386 $ wget http://repository.maemo.org/stable/diablo/maemo-sdk-install_4.1.2.sh

Start the install script and accept all choices:

scratchboxuser@i386 $ sh maemo-sdk-install_4.1.2.sh

start scratchbox

scratchboxuser@i386 $ /scratchbox/login
[sbox-DIABLO_ARMEL: ~] > sb-conf select DIABLO_ARMEL

Re-login

To re-login after a reboot of your virtual machine run

root@i386 $ /scratchbox/sbin/sbox_ctl start
root@i386 $ su - scratchboxuser
scratchboxuser@i386 $ /scratchbox/login

Hello world

Now we write the canonical hello world program in C.

[sbox-DIABLO_ARMEL: ~] > cat > main.c << EOF
#include <stdio.h>

int main()
{
  printf("hello world");
}
EOF
[sbox-DIABLO_ARMEL: ~] > gcc main.c
[sbox-DIABLO_ARMEL: ~] > file a.out
a.out: ELF 32-bit LSB executable, ARM, version 1 (SYSV), for GNU/Linux 2.6.8, dynamically linked (uses shared libs), not stripped

copy the file to your Nokia N810 using scp

=> the file is executable on the Nokia

Install Qt

Now it's time to install qt. Add to your /etc/apt/sources.list:

deb http://repository.maemo.org/extras/ diablo free non-free
deb-src http://repository.maemo.org/extras/ diablo free

and tell the system to re-read it:

apt-get update

install the qt development package:

apt-get install libqt4-dev

verify it has been installed:

mkdir qttest
cd qttest/
cat >main.cpp
#include <QApplication>
#include <QPushButton>
int main(int argc, char ** argv)
{
  QApplication qa(argc,argv);
  QPushButton* qp=new QPushButton("hello world");
  qp->show();
  return qa.exec();
}
qmake -project && qmake && make && ./qttest
g++ -c -pipe -O2 -Wall -W -D_REENTRANT -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/targets/DIABLO_ARMEL/usr/share/qt4/mkspecs/linux-g++ -I. -I/targets/DIABLO_ARMEL/usr/include/qt4/QtCore -I/targets/DIABLO_ARMEL/usr/include/qt4/QtGui -I/targets/DIABLO_ARMEL/usr/include/qt4 -I. -I. -o main.o main.cpp
g++ -Wl,-O1 -o qttest main.o    -L/usr/lib -lQtGui -lQtCore -lpthread
qttest: cannot connect to X server

Good - it tries to connect the X server, so it works.

See graphics

To see graphics, you need to start Xephyr. This example shows how to install and run it on SUSE Linux 11.1.

root@i386 $ yast -i xorg-x11-server-extra
root@i386 $ Xephyr :4

Now back in your scratchbox

[sbox-DIABLO_ARMEL: ~/qttest] > export DISPLAY=:4
[sbox-DIABLO_ARMEL: ~/qttest] > ./qttest

Now you should see a "hello world" button in a graphical window.

Install cmake

[sbox-DIABLO_ARMEL: ~/qttest] > wget http://www.cmake.org/files/v2.6/cmake-2.6.2.tar.gz
[sbox-DIABLO_ARMEL: ~/qttest] > tar xvzf cmake-2.6.2.tar.gz
[sbox-DIABLO_ARMEL: ~/qttest] > cd cmake-2.6.2
[sbox-DIABLO_ARMEL: ~/qttest] > ./bootstrap && make -j4 && make install

I ran into this issue, so I created link.txt by compiling cmake in a non-scratchbox environment and copying it over.

shared-mime-info

Shared-mime-info 0.2 or greater is needed for KDE.

[sbox-DIABLO_ARMEL: ~] > cd
[sbox-DIABLO_ARMEL: ~] > wget http://freedesktop.org/~hadess/shared-mime-info-0.20.tar.bz2
[sbox-DIABLO_ARMEL: ~] > bunzip2 shared-mime-info-0.20.tar.bz2
[sbox-DIABLO_ARMEL: ~] > tar xvf shared-mime-info-0.20.tar
[sbox-DIABLO_ARMEL: ~] > cd shared-mime-info-0.20
[sbox-DIABLO_ARMEL: ~] > ./configure && make && make install

Make sure version 0.2 is in place:

[sbox-DIABLO_ARMEL: ~] > update-mime-database -v
update-mime-database (shared-mime-info) 0.19
[...]
[sbox-DIABLO_ARMEL: ~] > export PATH=/usr/local/bin:$PATH
[sbox-DIABLO_ARMEL: ~] > update-mime-database -v
update-mime-database (shared-mime-info) 0.20
[...]

kdesupport

Compile kdesupport

apt-get install libboost-dev
apt-get install libboost-program-options-dev
apt-get install xsltproc
svn co https://svn.kde.org/home/kde/trunk/kdesupport
cd kdesupport
cmake . && make

If you again get the error about a missing link.txt, try copying /scratcbox/devkits/qemu/bin/qemu-arm-sb from a fremantle installation to /scratchbox/devkits/cputransp/bin and configure your target configuration to use this

make install

kdelibs

pcre

cd
curl ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-7.9.tar.gz>pcre-7.9.tar.gz
tar xvzf pcre-7.7.tar.gz
cd pcre-7.7
./configure && make && make install

svn co https://svn.kde.org/home/kde/branches/KDE/4.1/kdelibs

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