compile gcc5.3 on ubuntu 15.04

sudo apt-get install -y libgmp-dev libmpfr-dev libmpc-dev zlib1g-dev
wget ftp://ftp.gnu.org/gnu/gcc/gcc-5.3.0/gcc-5.3.0.tar.bz2
tar vf gcc-5.3.0.tar.bz2
mkdir outdir
cd outdir
../gcc-5.3.0/configure --disable-checking --program-suffix=-5.3 --enable-languages=c,c++,go,objc --disable-multilib --with-system-zlib prefix=/usr/local/gcc-5.3
make && make install

# choose gcc-5.3
update-alternatives --install /usr/bin/gcc gcc /usr/local/gcc-5.3/bin/gcc-5.3 30
update-alternatives --set gcc /usr/local/gcc-5.3/bin/gcc-5.3

If compiled failed, you can modify the "--enable-languages=c,c++,go,objc" to "--enable-languages=c,c++" and only support c and c++.