script to upgrade gcc on a linux server

upgrade_gcc.sh

#!/bin/bash -l

# download gcc source code
cd $HOME
wget http://mirrors.concertpass.com/gcc/releases/gcc-8.2.0/gcc-8.2.0.tar.gz
tar -xzf gcc-8.2.0.tar.gz
cd gcc-8.2.0/
./contrib/download_prerequisites

# config makefile
cd ..
mkdir objdir
cd objdir
$PWD/../gcc-8.2.0/configure --prefix=$HOME/GCC-8.2.0 --enable-languages=c,c++,fortran,go --disable-multilib

# build from source code, gonna take about 8 hours
make
make install

# soft-replace system compiler
echo 'export PATH="$HOME/GCC-8.2.0/bin:$PATH" ' >> ~/.bashrc
echo 'export LD_LIBRARY_PATH="$HOME/GCC-8.2.0/lib:$HOME/GCC-8.2.0/lib64:$LD_LIBRARY_PATH" ' >> ~/.bashrc
echo 'export CPATH="$HOME/GCC-8.2.0/include:$CPATH" ' >> ~/.bashrc