dnl @synopsis CHECK_AMD64()
dnl
dnl This macro tests whether a linux processor is an x86_64 and, if so,
dnl sets CFLAGS to contain -D__amd64__
dnl EM64T is also catered for by the above.
dnl @author: Alan Bleasby.
dnl

AC_DEFUN([CHECK_AMD64],
#
#
#
[AC_MSG_CHECKING([if Linux x86_64])

case $host_os in
linux*)
	if test "$host_cpu" = "x86_64"; then
    	    CFLAGS="${CFLAGS} -D__amd64__"
            AC_MSG_RESULT(yes)
        else
            AC_MSG_RESULT(no)
	fi
	;;
*)
	AC_MSG_RESULT(no)
 	;;
esac

])