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First you MUST use GCC >= 4.8

By default, on my Raspbian version : 2013-05-25-wheezy-raspbian, gcc is on version 4.7.2. So, how to install GCC 4.8? You can't use apt-get, so to build gcc from source there is what I did :

Dependencies installation¶

• Add in /etc/apt/sources.list :
  

  deb-src http://archive.raspbian.org/raspbian wheezy main contrib non-free
  

• Then install a few dependencies:
  

  sudo apt-get update
  sudo apt-get install lsb-release debhelper bison flex libmpfr-dev libmpc-dev zlib1g-dev libgmp3-dev
  sudo apt-get build-dep gcc-4.7 autoconf2.64
  

Install GCC¶

• Download the latest GCC 4.8
  

  wget https://ftp.gnu.org/gnu/gcc/gcc-4.8.1/gcc-4.8.1.tar.gz -O gcc-4.8.1.tar.gz
  tar xf gcc-4.8.1.tar.gz
  

• Get and apply patches
  

  wget http://anonscm.debian.org/viewvc/gcccvs/branches/sid/gcc-4.7/debian/patches/armhf-triplet.diff?view=co -O armhf-triplet.diff
  wget http://anonscm.debian.org/viewvc/gcccvs/branches/sid/gcc-4.7/debian/patches/gcc-multiarch-trunk.diff?view=co -O gcc-multiarch-trunk.diff
  cd gcc-4.8.1
  patch -p2 -i ../armhf-triplet.diff
  patch -p2 -i ../gcc-multiarch-trunk.diff
  cd gcc
  autoconf2.64
  cd ../libjava
  autoconf2.64
  cd ..
  

• GCC configuration
  

  cd ..
  mkdir obj
  cd obj
  ../gcc-4.8.1/configure --prefix=/opt/gdc --enable-shared --enable-linker-build-id --with-system-zlib --without-included-gettext --enable-threads=posix --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --enable-plugin --enable-objc-gc --disable-sjlj-exceptions --with-arch=armv6 --with-fpu=vfp --with-float=hard --build=arm-linux-gnueabihf --host=arm-linux-gnueabihf --target=arm-linux-gnueabihf --enable-checking=yes --disable-bootstrap --enable-languages=c,c++
  

• Compilation
  

  make 2>&1 | tee build.log
  

• Installation
  

  sudo make install
  

• Change symbolic links, this changes your currents gcc and g++ commands to use gcc 4.8
  

  sudo ln -s /opt/gdc/bin/gcc /usr/bin/gcc
  sudo ln -s /opt/gdc/bin/g++ /usr/bin/g++
  

Verification¶

• Commands should return GCC version 4.8
  

  gcc -v
  g++ -v
  

Compile Galera¶

So, now you have GCC 4.8 with atomic 8 bits operation!
But there is a bug which prevent you to build Galera lib with GCC 4.8

So you must use Galera revision higher than 149. At this time I used 152, but I think you safely use the latest version now.

• Download Galera (>149, in this case 152)
  

  wget http://bazaar.launchpad.net/~codership/galera/2.x/tarball/152?start_revid=176 -O galera.tgz
  tar xf galera.tgz
  

• Compilation
  

  cd \~codership/galera/2.x/
  scons boost_pool=0
  

We move the files later.

Install MariaDB¶

• Dependencies installation
  

  sudo apt-get install cmake make g++ libncurses5-dev mysql-client
  

• MariaDB Download
  

  http://ftp.osuosl.org/pub/mariadb/mariadb-galera-5.5.40/source/mariadb-galera-5.5.40.tar.gz
  tar xf mariadb-galera-5.5.40.tar.gz
  cd mariadb-5.5.40/
  

• Compilation
  

  cmake -G "Unix Makefiles" -DWITH_WSREP=ON -DWITH_INNODB_DISALLOW_WRITES=1
  make
  sudo make install
  

• Move Galera's need file to MariaDB repository
  

  sudo cp garb/garbd /usr/local/mysql/bin/
  sudo cp libgalera_smm.so /usr/local/mysql/lib/plugin/
  

Now just configure your database with Wsrep configuration and use it.

Resources¶

• https://groups.google.com/d/msg/codership-team/AzKmEJz7vTQ/JP8D4HXP-IYJ