#!/bin/bash

# Script will not work for GCC 4.8 or 4.9. For those, please see
# mac-mavericks-brew-gcc.sh

VERSION="4.7.2" # Script should also work with GCC 4.7.1.
PREFIX="/usr/gcc-${VERSION}"
LANGUAGES="c,c++,fortran"
MAKE="make -j 4"

brew-path() { brew info $1 | head -n3 | tail -n1 | cut -d' ' -f1; }

# Prerequisites

brew install gmp mpfr libmpc

# Next, download & install the latest GCC:

mkdir -p $PREFIX
mkdir temp-gcc
cd temp-gcc
wget ftp://ftp.gnu.org/gnu/gcc/gcc-$VERSION/gcc-$VERSION.tar.gz
tar xfz gcc-$VERSION.tar.gz
rm gcc-$VERSION.tar.gz
cd gcc-$VERSION

mkdir build
cd build

# Older versions of brew need brew-path instead of brew --prefix.
../configure \
     --prefix=$PREFIX \
     --with-gmp=$(brew --prefix gmp) \
     --with-mpfr=$(brew --prefix mpfr) \
     --with-mpc=$(brew --prefix libmpc) \
     --program-suffix=-$VERSION \
     --enable-languages=$LANGUAGES \
     --with-system-zlib \
     --enable-stage1-checking \
     --enable-plugin \
     --enable-lto \
     --disable-multilib

$MAKE bootstrap

make install

# Uncomment for cleanup …
# cd ../../..
# rm -r temp-gcc