
def build(ctx):
    bldnode = ctx.bldnode.abspath()

    if ctx.variant == "host":
        bison_source = ["ntp_parser.y"]

        ctx(
            features="c",
            includes=[ctx.bldnode.parent.abspath(), "../include", "."],
            source=bison_source,
            target="bison_obj",
        )

        # Generate Bison file first.
        ctx.add_group()

        keyword_gen_source = ["keyword-gen.c", ]

        ctx(
            features="c cprogram",
            includes=[ctx.bldnode.parent.abspath(), "../include", "."],
            install_path=None,
            source=keyword_gen_source,
            target="keyword-gen",
        )

        # XXX: needs a dependency to rebuild ntp_keyword.h
        #      when keyword-gen is rebuilt

        # Make sure keyword-gen is created next.
        ctx.add_group()

        ctx(
            features="c",
            rule="%s/ntpd/keyword-gen ${SRC} > ${TGT}" % bldnode,
            source="ntp_parser.tab.h",
            target="ntp_keyword.h"
        )

        # Make sure ntp_keyword.h is created last.
        ctx.add_group()

        return

    libntpd_source = [
        "ntp_control.c",
        "ntp_filegen.c",
        "ntp_leapsec.c",
        "ntp_monitor.c",    # Needed by the restrict code
        "ntp_recvbuff.c",
        "ntp_restrict.c",
        "ntp_util.c",
    ]

    if not ctx.env.DISABLE_NTS:
      libntpd_source += [
        "nts.c",
        "nts_server.c",
        "nts_client.c",
        "nts_cookie.c",
        "nts_extens.c",
    ]

    ctx(
        features="c",
        includes=[ctx.bldnode.parent.abspath(), "../include", "../libaes_siv"],
        source=libntpd_source,
        target="libntpd_obj",
        use="CRYPTO aes_siv",
    )

    ctx(
        target="ntpd_lib",
        features="c cstlib",
        use="libntpd_obj",
        # use="libntpd_obj bison_obj",
    )

    use_refclock = ""      # XXX: there must be a better way to do this
    if ctx.env.REFCLOCK_ENABLE:

        refclock_source = ["ntp_refclock.c",
			   "ntp_wrapdate.c",
                           "refclock_conf.c"
                           ]

        ctx(
            target="refclock",
            features="c",
            includes=[ctx.bldnode.parent.abspath(), "../include"],
            source=refclock_source,
        )
        use_refclock += "refclock"

        for file, define in ctx.env.REFCLOCK_SOURCE:
            ctx(
                defines=["%s=1" % define],
                features="c",
                includes=[ctx.bldnode.parent.abspath(), "../include", "../libjsmn"],
                # XXX: These need to go into config.h
                #      rather than the command line for the individual drivers
                source="refclock_%s.c" % file,
                target="refclock_%s" % file,
            )
            use_refclock += " refclock_%s" % file

    ntpd_source = [
        "ntp_config.c",
        "ntp_io.c",
        "ntp_loopfilter.c",
        "ntp_packetstamp.c",
        "ntp_peer.c",
        "ntp_proto.c",
        "ntp_sandbox.c",
        "ntp_scanner.c",
        "ntp_signd.c",
        "ntp_timer.c",
        "ntp_dns.c",
        "ntpd.c",
        ctx.bldnode.parent.find_node("host/ntpd/ntp_parser.tab.c")
    ]

    ctx(
        features="c rtems_trace cprogram",
        includes=[
            ctx.bldnode.parent.abspath(), "../include",
            "%s/host/ntpd/" % ctx.bldnode.parent.abspath(), "." ],
        install_path='${SBINDIR}',
        source=ntpd_source,
        target="ntpd",
        use="libntpd_obj ntp M parse RT CAP SECCOMP PTHREAD NTPD "
            "CRYPTO SSL DNS_SD %s SOCKET NSL SCF" % use_refclock,
    )

    ctx.manpage(8, "ntpd-man.adoc")
    ctx.manpage(5, "ntp.conf-man.adoc")
    ctx.manpage(5, "ntp.keys-man.adoc")
