cross_compile

TOOLCHAIN_DIR=/opt/toolchains

# linaro compiler
# url: https://launchpad.net/linaro-toolchain-binaries/trunk/
check_and_get_linaro()
{
    COMPILER_ARCH=$1
    TOOLCHAIN_VER=$2
    COMPILER_VER=$3
    COMPILER_REV=$4

    if [ "${COMPILER_REV}" != "" ]; then
        COMPILER_NAME=gcc-linaro-${COMPILER_ARCH}-${TOOLCHAIN_VER}-${COMPILER_VER}-${COMPILER_REV}_linux
    else
        COMPILER_NAME=gcc-linaro-${COMPILER_ARCH}-${TOOLCHAIN_VER}-${COMPILER_VER}_linux
    fi

    if [ ! -d ${TOOLCHAIN_DIR}/${COMPILER_NAME}/${COMPILER_ARCH} ]; then
        if [ ! -e ${COMPILER_NAME}.tar.bz2 ]; then
            wget --no-check-certificate https://launchpad.net/linaro-toolchain-binaries/trunk/${COMPILER_VER}/+download/${COMPILER_NAME}.tar.bz2
        fi

        sudo mkdir -p ${TOOLCHAIN_DIR}
        sudo tar jxf ${COMPILER_NAME}.tar.bz2 -C ${TOOLCHAIN_DIR}
        #rm ${COMPILER_NAME}
    fi

    echo ${TOOLCHAIN_DIR}/${COMPILER_NAME}/bin/${COMPILER_ARCH}-
}

# aosp compiler
check_and_get_aosp_prebuild()
{
    COMPILER_ARCH=$1
    COMPILER_VER=$2

    if [ ! -d ${TOOLCHAIN_DIR}/${COMPILER_ARCH}-${COMPILER_VER} ]; then
        #(temprary)getting from dropbox
        if [ "${COMPILER_VER}" = "4.8" ]; then
            wget --no-check-certificate https://dl.dropboxusercontent.com/u/63613486/toolchains/${COMPILER_ARCH}-${COMPILER_VER}.tar.bz2
        else
            wget --no-check-certificate https://dl.dropbox.com/u/95052256/prebuild/${COMPILER_ARCH}-${COMPILER_VER}.tar.bz2
        fi

        sudo mkdir -p ${TOOLCHAIN_DIR}
        sudo tar jxf ${COMPILER_ARCH}-${COMPILER_VER}.tar.bz2 -C ${TOOLCHAIN_DIR}
    fi

    echo ${TOOLCHAIN_DIR}/${COMPILER_ARCH}-${COMPILER_VER}/bin/${COMPILER_ARCH}-
}


# use linaro compiler
# export BUILD_CROSS_COMPILE=`check_and_get_linaro arm-linux-gnueabihf 4.8 2013.10`

# use aosp prebuilts
export BUILD_CROSS_COMPILE=`check_and_get_aosp_prebuild arm-eabi 4.8`

# export compiler option
export USE_CFLAGS_OPTION=y