Download and install gcc for other targets and versions

gcc-cross-compiler.sh

#!/usr/bin/env bash
GCC="gcc-8.2.0"
BINUTILS="binutils-2.31.1"
GDB="gdb-9.1"
PREFIX=$(pwd)/cross
COMPILEFLAGS=--disable-multilib

mkdir $GCC-elf-objs
mkdir ${GDB}-build

wget --no-clobber --no-check-certificate https://ftp.gnu.org/gnu/binutils/${BINUTILS}.tar.gz
wget --no-clobber --no-check-certificate https://ftp.gnu.org/gnu/gcc/${GCC}/${GCC}.tar.gz
wget --no-clobber --no-check-certificate http://ftp.gnu.org/gnu/gdb/${GDB}.tar.gz

[ ! -d ${BINUTILS} ] && tar -zxf ${BINUTILS}.tar.gz
[ ! -d ${GCC} ] && tar -zxf ${GCC}.tar.gz
[ ! -d ${GDB} ] && tar -zxf ${GDB}.tar.gz

cd ${BINUTILS}
./configure --prefix="${PREFIX}" --disable-nls --disable-werror --with-sysroot ${COMPILEFLAGS}
make && make install
cd -

cd ${GCC}
./contrib/download_prerequisites
cd -

cd ${GCC}-elf-objs
../${GCC}/configure --prefix="${PREFIX}" --disable-nls --enable-languages=c --without-headers ${COMPILEFLAGS}
make all-gcc && make all-target-libgcc && make install-gcc && make install-target-libgcc
cd -

cd ${GDB}-build
../${GDB}/configure --prefix="${PREFIX}" ${COMPILEFLAGS}
make && make install
cd -