Add script to make cross compiler

cross.sh

+#!/bin/bash
+
+if [[ "$1" == "" ]]
+then
+   echo "Usage: $0 /path/to/install/dir"
+   exit
+fi
+
+echo "Ensure you have libgmp3-dev libmpfr-dev libisl-dev libcloog-isl-dev libmpc-dev texinfo installed, as well as build-essential"
+
+export PREFIX="$1"
+export TARGET=i686-elf
+export PATH="$PREFIX/bin:$PATH"
+
+mkdir -p $PREFIX/build/tarballs
+cd $PREFIX/build/tarballs
+
+wget "ftp://ftp.gnu.org/gnu/gcc/gcc-4.8.4/gcc-4.8.4.tar.gz"
+wget "ftp://ftp.gnu.org/gnu/binutils/binutils-2.25.tar.gz"
+
+mkdir -p $PREFIX/build
+cd $PREFIX/build
+
+tar -zxf "tarballs/binutils-2.25.tar.gz"
+tar -zxf "tarballs/gcc-4.8.4.tar.gz"
+
+mkdir $PREFIX/build/binutils-build
+cd $PREFIX/build/binutils-build
+
+../binutils-2.25/configure --target=$TARGET --prefix="$PREFIX" --with-sysroot --disable-nls --disable-werror
+make
+make install
+
+mkdir -p $PREFIX/build/gcc
+cd $PREFIX/build/gcc
+
+which -- $TARGET-as || echo "$TARGET-as is not in the PATH"
+
+../gcc-4.8.4/configure --target=$TARGET --prefix="$PREFIX" --disable-nls --enable-languages=c,c++ --without-headers
+
+make all-gcc
+make all-target-libgcc
+make install-gcc
+make install-target-libgcc