From 20acc133936c7e19f4e8699cc66720e48b0edbb9 Mon Sep 17 00:00:00 2001
From: Kha Vo <canhkha@gmail.com>
Date: Fri, 8 Apr 2016 14:13:23 -0600
Subject: [PATCH] Networking: IAR compiler does not tolerate empty unions

---
 include/nuttx/net/ip.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/nuttx/net/ip.h b/include/nuttx/net/ip.h
index c707b91bda..6a494bd283 100644
--- a/include/nuttx/net/ip.h
+++ b/include/nuttx/net/ip.h
@@ -100,6 +100,7 @@
 
 typedef uint16_t net_ipv6addr_t[8];
 
+#if defined(CONFIG_NET_IPv4) || defined(CONFIG_NET_IPv6)
 /* Describes and address in either the IPv4 or IPv6 domain */
 
 union ip_addr_u
@@ -116,7 +117,9 @@ union ip_addr_u
   net_ipv6addr_t ipv6;
 #endif
 };
+#endif
 
+#if defined(CONFIG_NET_IPv4) || defined(CONFIG_NET_IPv6)
 /* Describes address binding for a PF_INET or PF_INET6 socket */
 
 union ip_binding_u
@@ -145,6 +148,7 @@ union ip_binding_u
   } ipv6;
 #endif /* CONFIG_NET_IPv6 */
 };
+#endif
 
 #ifdef CONFIG_NET_IPv4
 /* The IPv4 header */