echo 'WARNING: Do not source build.config.common. Instead:
    - If you need -D__ANDROID_COMMON_KERNEL__ in KCFLAGS, set kernel_build.kcflags.
    - If you still have build configs, use:
        . ${ROOT_DIR}/${KERNEL_DIR}/build.config.constants
    - If you do not have any build configs, delete kernel_build.build_config entirely.
' >&2

. ${ROOT_DIR}/${KERNEL_DIR}/build.config.constants

KCFLAGS="${KCFLAGS} -D__ANDROID_COMMON_KERNEL__"