#!/bin/bash

# Hackish script that builds a uMPS (bare MIPS ELF) toolchain
#
# Usage:
#     1. Modify {BINUTILS,GCC}_REL and XT_{PREFIX,TARGET} below as desired.
#        The script will install the toolchain under $XT_PREFIX.
#     2. Run this script!
#
# Written by Tomislav Jonjic <tjonjic@gmail.com>, released as public domain.

BINUTILS_REL=ftp://ftp.gnu.org/gnu/binutils/binutils-2.22.tar.bz2
GCC_REL=ftp://ftp.gnu.org/gnu/gcc/gcc-4.6.2/gcc-core-4.6.2.tar.bz2

XT_PREFIX=$HOME/umpsxt
XT_TARGET=mipsel-elf

export PATH=$XT_PREFIX/bin:$PATH

set -e

fatal ()
{
    echo "Error: $1"
    exit 1
}

get_compres_type ()
{
    case $1 in
        *.gz)
            echo 'z' ;;
        *.bz2)
            echo 'j' ;;
        *)
            fatal "Unknown compression"
    esac
}

prg_name ()
{
    tar $(get_compres_type $1)tf "$1" | head -1 | cut -d/ -f1
}

# Download, unpack, configure, build, install a package
build_pkg ()
{
    local pkg_rel=$1
    local conf_opts="$2"
    local make_target="${3:-all}"
    local mkinst_target="${4:-install}"
    local pkg_name

    # Download and unpack
    test -f $(basename $pkg_rel) || wget $pkg_rel
    pkg_name=$(prg_name $(basename $pkg_rel))

    if [ ! -d $pkg_name ]; then
        tar $(get_compres_type $pkg_rel)xf $(basename $pkg_rel)
    fi

    # Configure
    if [ -d ${pkg_name}-bld ] ; then
        rm -rf ${pkg_name}-bld
    fi
    mkdir ${pkg_name}-bld
    cd ${pkg_name}-bld
    ../$pkg_name/configure $conf_opts

    # Build
    make $make_target

    # Install
    make $mkinst_target

    cd ..
}

build_pkg $BINUTILS_REL \
          "--prefix=$XT_PREFIX --target=$XT_TARGET --disable-nls"

build_pkg $GCC_REL \
          "--prefix=$XT_PREFIX --target=$XT_TARGET --enable-languages=c --without-headers --disable-nls" \
          'all-gcc' \
          'install-gcc'