#

# lldp_CHECK_LIBEVENT

#

AC_DEFUN([lldp_CHECK_LIBEVENT], [

  # Do we require embedded libevent?

  AC_ARG_WITH([embedded-libevent],

    AS_HELP_STRING(

      [--with-embedded-libevent],

      [Use embedded libevent @<:@default=auto@:>@]

  ), [], [with_embedded_libevent=auto])

  if test x"$with_embedded_libevent" = x"yes"; then

     LIBEVENT_EMBEDDED=1

  else

    # If not forced, check first with pkg-config

    PKG_CHECK_MODULES([LIBEVENT], [libevent >= 2.0.5], [

       # Check if we have a working libevent

       AC_MSG_CHECKING([if system libevent works as expected])

       _save_CFLAGS="$CFLAGS"

       _save_LIBS="$LIBS"

       CFLAGS="$CFLAGS $LIBEVENT_CFLAGS"

       LIBS="$LIBS $LIBEVENT_LIBS"

       AC_TRY_LINK([

@%:@include <sys/time.h>

@%:@include <sys/types.h>

@%:@include <event2/event.h>], [ struct event_base *base = event_base_new(); event_new(base, -1, 0, NULL, NULL); ],

       [

         AC_MSG_RESULT([yes])

       ], [

         if test x"$with_embedded_libevent" = x"auto"; then

           AC_MSG_RESULT([no, using shipped libevent])

           LIBEVENT_EMBEDDED=1

         else

           AC_MSG_ERROR([*** unusable system libevent])

         fi

       ])

       CFLAGS="$_save_CFLAGS"

       LIBS="$_save_LIBS"

    ], [

      # No appropriate version, let's use the shipped copy if possible

      if test x"$with_embedded_libevent" = x"auto"; then

        AC_MSG_NOTICE([using shipped libevent])

        LIBEVENT_EMBEDDED=1

      else

        AC_MSG_ERROR([*** libevent not found])

      fi

    ])

  fi

  if test x"$LIBEVENT_EMBEDDED" != x; then

    unset LIBEVENT_LIBS

    LIBEVENT_CFLAGS="-I\$(top_srcdir)/libevent/include -I\$(top_builddir)/libevent/include"

    LIBEVENT_LDFLAGS="\$(top_builddir)/libevent/libevent.la"

  fi

  # Call ./configure in libevent. Need it for make dist...

  libevent_configure_args="$libevent_configure_args --disable-libevent-regress"

  libevent_configure_args="$libevent_configure_args --disable-thread-support"

  libevent_configure_args="$libevent_configure_args --disable-openssl"

  libevent_configure_args="$libevent_configure_args --disable-malloc-replacement"

  libevent_configure_args="$libevent_configure_args --disable-debug-mode"

  libevent_configure_args="$libevent_configure_args --enable-function-sections"

  libevent_configure_args="$libevent_configure_args --disable-shared"

  libevent_configure_args="$libevent_configure_args --with-pic"

  libevent_configure_args="$libevent_configure_args --enable-static"

  lldp_CONFIG_SUBDIRS([libevent], [$libevent_configure_args])

  AM_CONDITIONAL([LIBEVENT_EMBEDDED], [test x"$LIBEVENT_EMBEDDED" != x])

  AC_SUBST([LIBEVENT_LIBS])

  AC_SUBST([LIBEVENT_CFLAGS])

  AC_SUBST([LIBEVENT_LDFLAGS])

])