[ovs-dev] [PATCH] configure: Only link against libpcap on FreeBSD.

[Ben Pfaff]

On other platforms there is no benefit to linking against libpcap, because
it is not used.

Signed-off-by: Ben Pfaff <blp at nicira.com>
CC: Ed Maste <emaste at freebsd.org>
---
 acinclude.m4 |    7 ++++++-
 configure.ac |    3 +--
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/acinclude.m4 b/acinclude.m4
index f0610c9..19a47dd 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -1,6 +1,6 @@
 # -*- autoconf -*-
 
-# Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc.
+# Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -295,6 +295,8 @@ AC_DEFUN([OVS_CHECK_IF_PACKET],
    fi])
 
 dnl Checks for net/if_dl.h.
+dnl
+dnl (We use this as a proxy for checking whether we're building on FreeBSD.)
 AC_DEFUN([OVS_CHECK_IF_DL],
   [AC_CHECK_HEADER([net/if_dl.h],
                    [HAVE_IF_DL=yes],
@@ -303,6 +305,9 @@ AC_DEFUN([OVS_CHECK_IF_DL],
    if test "$HAVE_IF_DL" = yes; then
       AC_DEFINE([HAVE_IF_DL], [1],
                 [Define to 1 if net/if_dl.h is available.])
+
+      # On FreeBSD we use libpcap to access network devices.
+      AC_SEARCH_LIBS([pcap_open_live], [pcap])
    fi])
 
 dnl Checks for buggy strtok_r.
diff --git a/configure.ac b/configure.ac
index 1cacd29..bd49179 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-# Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc.
+# Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -44,7 +44,6 @@ AC_SYS_LARGEFILE
 AC_SEARCH_LIBS([pow], [m])
 AC_SEARCH_LIBS([clock_gettime], [rt])
 AC_SEARCH_LIBS([timer_create], [rt])
-AC_SEARCH_LIBS([pcap_open_live], [pcap])
 
 OVS_CHECK_ESX
 OVS_CHECK_COVERAGE
-- 
1.7.2.5