Build-Environment for QT5-Apps on the Raspberry Pi

#!/bin/bash
#
# this script creates a build environment for
# QT5-based applications for the Raspberry Pi
#
# the script is tested on Ubuntu 14 32 Bit

# first we need to set the LANG to a default value
export LANG=C

# we need some commands
testCommands()
{
  sudo apt-get install build-essential
  echo "checking needed programs";
  [ -x /usr/bin/wget ] || exit 1;
  [ -x /usr/bin/git ] ||  exit 2;
  [ -x /usr/bin/unzip ] || exit 3;
  [ -x /sbin/fdisk ] || exit 4;
  [ -x /bin/grep ] || exit 5;
  [ -x /usr/bin/awk ] || exit 6;
  echo "done";
}

# here we fetch the current raspbian image and mount them
getRootFs()
{
  echo "getting Raspberry Pi image";
  mkdir rootfs;
  wget http://downloads.raspberrypi.org/raspbian/images/raspbian-2015-02-17/2015-02-16-raspbian-wheezy.zip;
  unzip 2015-02-16-raspbian-wheezy.zip;
  # UNITS and START are needed to calculate the offset for the mount command
  UNITS=$(/sbin/fdisk -l 2015-02-16-raspbian-wheezy.img|grep Units|awk '{print $9}');
  START=$(/sbin/fdisk -l 2015-02-16-raspbian-wheezy.img|grep img2|awk '{print $2}');
  OFFSET=$(($UNITS * $START))
  sudo mount -t ext4 -o offset=$OFFSET $PWD/2015-02-16-raspbian-wheezy.img $PWD/rootfs
}

# we need a cross-compiler and a couple of variables to use them
getCompiler()
{
  git clone https://github.com/raspberrypi/tools.git
  cat > variables.sh <<EOF
PWD=$(pwd)
export TOOLCHAIN=$PWD/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian
export PATH=$PWD/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin:$PATH
export ROOTFS=$PWD/rootfs
export CC='arm-linux-gnueabihf-gcc -march=armv4t -mtune=arm920t'
export CXX='arm-linux-gnueabihf-g++ -march=armv4t -mtune=arm920t'
export CROSS_COMPILE=arm-linux-gnueabihf-
export LDFLAGS="-L$PWD/rootfs/usr/lib -L$PWD/rootfs/usr/local/qt5pi/lib"
export CFLAGS="-I$PWD/rootfs/usr/include -I$PWD/rootfs/usr/local/qt5pi/include"
export CXXFLAGS="-I$PWD/rootfs/usr/include -I$PWD/rootfs/usr/local/qt5pi/include"
export QTDIR=/usr/local/qt5pi
EOF
  PWD=$(pwd)
  # fix the library paths in the raspberry image
  git clone git://gitorious.org/cross-compile-tools/cross-compile-tools.git
  sudo cross-compile-tools/fixQualifiedLibraryPaths $PWD/rootfs/ $PWD/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-gcc
}

# here we cross-compile QT 5.4.0. we start with qtbase. after that
# we compile the additional modules
getQt5()
{
  wget http://download.qt-project.org/official_releases/qt/5.4/5.4.0/single/qt-everywhere-opensource-src-5.4.0.tar.gz
  tar xvfz qt-everywhere-opensource-src-5.4.0.tar.gz

  pushd qt-everywhere-opensource-src-5.4.0
  pushd qtbase
  ./configure -prefix /usr/local/qt5pi -release \
    -opensource -confirm-license -device linux-rasp-pi-g++ \
    -make libs -optimized-qmake -device-option \
    CROSS_COMPILE=$ROOT/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf- \
    -nomake tests -nomake examples -reduce-exports \
    -sysroot $ROOT/rootfs -opengl es2
  make && sudo make install
  popd
  for i in qtactiveqt qtandroidextras qtbase qtconnectivity \
             qtdeclarative qtdoc qtenginio qtgraphicaleffects \
             qtimageformats qtlocation qtmultimedia qtquick1 \
             qtquickcontrols qtscript qtsensors qtserialport \
             qtsvg qttools qttranslations qtwebchannel \
             qtwebengine qtwebkit qtwebsockets qtxmlpatterns
  do
    pushd $i
    /usr/local/qt5pi/bin/qmake && make && sudo make install
    popd
  done
  popd
}


testCommands;
mkdir Raspberry
pushd Raspberry
ROOT=$(pwd)
getRootFs
getCompiler
getQt5
echo "QT5 built"