[ -n "$TOOLCHAIN_HELPER" ] && return || readonly TOOLCHAIN_HELPER=1

tc_usage()
{
    echo -e "\tARCH:\t\t which arch to build (arm, armeb, arm64, arm64be), default: arm"
    echo -e "\tTOOLCHAIN_RELEASE: set toolchain release, default: ${TOOLCHAIN_RELEASE}"
}

find_toolchain_to_download()
{
    export ARCH=${ARCH:-arm}
    TOOLCHAIN_RELEASE="${TOOLCHAIN_RELEASE:-14.09}"
    toolchain_url="http://releases.linaro.org/${TOOLCHAIN_RELEASE}/components/toolchain/binaries/gcc-linaro-arm-linux-gnueabihf-4.9-20${TOOLCHAIN_RELEASE}_linux.tar.xz"
    [[ ${ARCH} == "armeb" ]] && toolchain_url="http://releases.linaro.org/${TOOLCHAIN_RELEASE}/components/toolchain/binaries/gcc-linaro-armeb-linux-gnueabihf-4.9-20${TOOLCHAIN_RELEASE}_linux.tar.xz"
    [[ ${ARCH} == "arm64" ]] && toolchain_url="http://releases.linaro.org/${TOOLCHAIN_RELEASE}/components/toolchain/binaries/gcc-linaro-aarch64-linux-gnu-4.9-20${TOOLCHAIN_RELEASE}_linux.tar.xz"
    [[ ${ARCH} == "arm64be" ]] && toolchain_url="http://releases.linaro.org/${TOOLCHAIN_RELEASE}/components/toolchain/binaries/gcc-linaro-aarch64_be-linux-gnu-4.9-20${TOOLCHAIN_RELEASE}_linux.tar.xz"
    echo $toolchain_url
    export tcbindir="$HOME/$ARCH-tc-${TOOLCHAIN_RELEASE}/bin"
    mkdir -p $(dirname ${tcbindir})
}

install_custom_toolchain()
{
    test -d ${tcbindir} && return 0
    test -z "${toolchain_url}" && return 0
    toolchain=`basename ${toolchain_url}`
    test -f ${toolchain} || curl -sSO ${toolchain_url}
    mkdir -p `dirname ${tcbindir}`
    tar --strip-components=1 -C `dirname ${tcbindir}` -xf ${toolchain}
    if [[ $? -ne 0 ]]; then
        echo "NO toolchain to extract..."
        exit 1
    fi
}

setup_compiler_prefix()
{
    export PATH="${tcbindir}:$PATH"
    if [ "${ARCH}" = "arm" ]; then
      compiler_prefix="arm-linux-gnueabihf"
    elif [ "$ARCH" = "armeb" ]; then
      compiler_prefix="armeb-linux-gnueabihf"
    elif [ "$ARCH" = "arm64" ]; then
      compiler_prefix="aarch64-linux-gnu"
    elif [ "$ARCH" = "arm64be" ]; then
      compiler_prefix="aarch64_be-linux-gnu"
    fi

    export CROSS_COMPILE=${compiler_prefix}-
}
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