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
    if [ ! $4 == "" ]; then
        COMPILER_REV="-"$4"_linux"
    else
        COMPILER_REV="_linux"
    fi

    if [ ! -d $TOOLCHAIN_DIR/gcc-linaro-$COMPILER_ARCH-$TOOLCHAIN_VER-$COMPILER_VER$COMPILER_REV/$COMPILER_ARCH ]; then
        wget --no-check-certificate https://launchpad.net/linaro-toolchain-binaries/trunk/$COMPILER_VER/+download/gcc-linaro-$COMPILER_ARCH-$TOOLCHAIN_VER-$COMPILER_VER$COMPILER_REV.tar.bz2
        sudo mkdir -p $TOOLCHAIN_DIR
        sudo tar jxvf gcc-linaro-$COMPILER_ARCH-$TOOLCHAIN_VER-$COMPILER_VER$COMPILER_REV.tar.bz2 -C $TOOLCHAIN_DIR
        #rm gcc-linaro-$COMPILER_ARCH-$TOOLCHAIN_VER-$COMPILER_VER-$COMPILER_REV.tar.bz2
    fi

    echo $TOOLCHAIN_DIR/gcc-linaro-$COMPILER_ARCH-$TOOLCHAIN_VER-$COMPILER_VER$COMPILER_REV/bin/$COMPILER_ARCH-
}

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

    if [ ! -d $TOOLCHAIN_DIR/$COMPILER_ARCH-$COMPILER_VER ]; then
        #(temprary)getting from dropbox
        wget --no-check-certificate https://dl.dropbox.com/u/95052256/prebuild/$COMPILER_ARCH-$COMPILER_VER.tar.bz2
        sudo mkdir -p $TOOLCHAIN_DIR
        sudo tar jxvf $COMPILER_ARCH-$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 4.7 2013.04 20130415`

# use aosp prebuilts
# export BUILD_CROSS_COMPILE=`check_and_get_aosp_prebuild arm-eabi 4.6`

# export compiler option
export USE_CFLAGS_OPTION=y