m4/libevent.m4

   1 #
   2 # lldp_CHECK_LIBEVENT
   3 #
   4
   5 AC_DEFUN([lldp_CHECK_LIBEVENT], [
   6   LIBEVENT_URL=http://libevent.org/
   7   _save_LIBS="$LIBS"
   8   _save_CFLAGS="$CFLAGS"
   9   _save_CC="$CC"
  10
  11   # First, try with pkg-config
  12   PKG_CHECK_MODULES([LIBEVENT], [libevent >= 1.4.3], [], [:])
  13
  14   AC_MSG_CHECKING([how to compile with libevent])
  15   if test x"$1" = x -o x"$1" = x"yes"; then
  16      # Nothing specified, use default location from pkg-config
  17      :
  18   else
  19      # Black magic....
  20      if test -d "$1"; then
  21         libevent_dir=`readlink -f "$1"`
  22         # Directory, dynamic linking
  23         if test -d "${libevent_dir}/lib"; then
  24            LIBEVENT_LIBS="-L${libevent_dir}/lib -levent"
  25         else
  26            LIBEVENT_LIBS="-L${libevent_dir} -levent"
  27         fi
  28         if test -d "${libevent_dir}/include"; then
  29            LIBEVENT_CFLAGS="-I${libevent_dir}/include"
  30         else
  31            LIBEVENT_CFLAGS="-I${libevent_dir}"
  32         fi
  33      else if test -f "$1"; then
  34         LIBEVENT_LIBS=`readlink -f "$1"`
  35         dir=`AS_DIRNAME(["$1"])`
  36         for includedir in "$dir/include" "$dir/../include" "$dir"; do
  37             if test -d "$includedir"; then
  38                LIBEVENT_CFLAGS=-I`readlink -f "$includedir"`
  39                break
  40             fi
  41         done
  42      else
  43         AC_MSG_RESULT(failed)
  44         AC_MSG_ERROR([*** non-existant directory ($1) specified for libevent!])
  45      fi
  46      fi
  47   fi
  48
  49   # Can I compile and link it? We need to use libtool
  50   LIBS="$LIBS $LIBEVENT_LIBS"
  51   CFLAGS="$LIBEVENT_CFLAGS $CFLAGS"
  52   CC="${SHELL-/bin/sh} libtool link $CC"
  53   AC_TRY_LINK([
  54 @%:@include <sys/time.h>
  55 @%:@include <sys/types.h>
  56 @%:@include <event2/event.h>], [ event_base_new(); ],
  57        [ libevent_linked=yes ], [ libevent_linked=no ])
  58
  59   if test x"$libevent_linked" = x"yes"; then
  60     AC_SUBST([LIBEVENT_LIBS])
  61     AC_SUBST([LIBEVENT_CFLAGS])
  62     AC_MSG_RESULT([ok with $LIBEVENT_LIBS $LIBEVENT_CFLAGS])
  63   else
  64     if test x"$LIBEVENT_LIBS" = x; then
  65       AC_MSG_RESULT([no libevent])
  66     else
  67       AC_MSG_RESULT([failed with $LIBEVENT_LIBS $LIBEVENT_CFLAGS])
  68     fi
  69     AC_MSG_ERROR([
  70 *** libevent 2.x is required. Grab it from $LIBEVENT_URL
  71 *** or install libevent-dev package])
  72   fi
  73
  74   CC="$_save_CC"
  75   LIBS="$_save_LIBS"
  76   CFLAGS="$_save_CFLAGS"
  77 ])