GCC cross compiler

build-gcc-cross-compiler.sh

#!/bin/bash

# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# NOTE:This script works only with bash
#
# Build a cross compiler(gcc) for a requested platform.

PROGNAME=${0##*/}
OPTIND=1
BUILDDIR=""
PLATFORM=""

function usage() {
    echo -e "USAGE: ./${PROGNAME} -p <target-platform> -b <builddir>"
    echo -e "WHERE:"
    echo -e "    <target-platform> - [i686,arm]."
    echo -e "    <build-dir> - build directory."
}

function validate_builddir() {
    if [ "$BUILDDIR" == "" ];
    then
        echo -e "Need to specify build directory with '-b'.\n"
        usage
        exit 1
    fi
}

function validate_platform() {
    if [ "$PLATFORM" == "" ];
    then
        echo -e "Need to specify platform with '-p'\n"
        usage
        exit 1
    fi

    case "$PLATFORM" in
        "arm")
            return
            ;;
        "i686")
            return
            ;;
    esac

    echo -e "Invalid platform. Chose one of [arm, i686]"
    exit 1
}

while getopts "h?b:p:" opt;
do
    case "$opt" in
        h|\?)
            usage
            exit 0
            ;;
        b)
            BUILDDIR=$OPTARG
            ;;
        p)
            PLATFORM=$OPTARG
            ;;
    esac
done

shift $((OPTIND-1))

validate_builddir
validate_platform


[ "$1" = "--" ] && shift
# What's left will now be available in $@

echo "PLATFORM=$PLATFORM, BUILDDIR=$BUILDDIR"