case "$machine" in

riscv*)

    xlen=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | sed -n 's/^#define __riscv_xlen \(.*\)/\1/p'`

    flen=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | sed -n 's/^#define __riscv_flen \(.*\)/\1/p'`

    float_abi=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | sed -n 's/^#define __riscv_float_abi_\([^ ]*\) .*/\1/p'`

    atomic=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | grep '#define __riscv_atomic' | cut -d' ' -f2`

    case "$xlen" in

    32)

	echo "glibc does not yet support 32-bit systems" >&2

	exit 1

	;;

    64)

	;;

    *)

	echo "Unable to determine XLEN" >&2

	exit 1

	;;

    esac

    case "$flen" in

    64)

	float_machine=rvd

	with_fp_cond=1

	;;

    32)

	echo "glibc does not yet support systems with the F but not D extensions" >&2

	exit 1

	;;

    "")

	with_fp_cond=0

	;;

    *)

	echo "Unable to determine FLEN" >&2

	exit 1

	;;

    esac

    case "$float_abi" in

    soft)

	abi_flen=0

	;;

    single)

	echo "glibc does not yet support the single floating-point ABI" >&2

	exit 1

	;;

    double)

	abi_flen=64

	;;

    *)

	echo "Unable to determine floating-point ABI" >&2

	exit 1

	;;

    esac

    case "$atomic" in

    __riscv_atomic)

        ;;

    *)

        echo "glibc requires the A extension" >&2

	exit 1

	;;

    esac

    base_machine=riscv

    machine=riscv/rv$xlen/$float_machine

    $as_echo "#define RISCV_ABI_XLEN $xlen" >>confdefs.h

    $as_echo "#define RISCV_ABI_FLEN $abi_flen" >>confdefs.h

    ;;

esac