[Ubuntu >= 12.04] install gcc/g++ 4.7, 4.8 and 5.4.1


        
            
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            sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install -y gcc-4.7 g++-4.7
sudo apt-get install -y gcc-4.8 g++-4.8
sudo apt-get install -y gcc-5 g++-5
update-alternatives --display gcc
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-5 60 --slave /usr/bin/g++ g++ /usr/bin/g++-5
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 40 --slave /usr/bin/g++ g++ /usr/bin/g++-4.8
update-alternatives --display gcc
gcc -v
see also: http://mortenvp.com/installing-a-newer-gccg-on-ubuntu-12-04-lts/