Try to make gcc work without -Wno-address

src/core/ip.c

@@ -67,6 +67,49 @@ struct ip_globals ip_data;
 
 const ip_addr_t ip_addr_any_type = IPADDR_ANY_TYPE_INIT;
 
+/**
+ * @ingroup ipaddr
+ * Convert numeric IP address (both versions) into ASCII representation.
+ * returns ptr to static buffer; not reentrant!
+ *
+ * @param addr ip address in network order to convert
+ * @return pointer to a global static (!) buffer that holds the ASCII
+ *         representation of addr
+ */
+char *ipaddr_ntoa(const ip_addr_t *addr)
+{
+  if (addr == NULL) {
+    return NULL;
+  }
+  if (IP_IS_V6(addr)) {
+    return ip6addr_ntoa(ip_2_ip6(addr));
+  } else {
+    return ip4addr_ntoa(ip_2_ip4(addr));
+  }
+}
+
+/**
+ * @ingroup ipaddr
+ * Same as ipaddr_ntoa, but reentrant since a user-supplied buffer is used.
+ *
+ * @param addr ip address in network order to convert
+ * @param buf target buffer where the string is stored
+ * @param buflen length of buf
+ * @return either pointer to buf which now holds the ASCII
+ *         representation of addr or NULL if buf was too small
+ */
+char *ipaddr_ntoa_r(const ip_addr_t *addr, char *buf, int buflen)
+{
+  if (addr == NULL) {
+    return NULL;
+  }
+  if (IP_IS_V6(addr)) {
+    return ip6addr_ntoa_r(ip_2_ip6(addr), buf, buflen);
+  } else {
+    return ip4addr_ntoa_r(ip_2_ip4(addr), buf, buflen);
+  }
+}
+
 /**
  * @ingroup ipaddr
  * Convert IP address string (both versions) to numeric.

src/core/ipv4/ip4_addr.c

@@ -281,7 +281,7 @@ ip4addr_ntoa(const ip4_addr_t *addr)
 }
 
 /**
- * Same as ipaddr_ntoa, but reentrant since a user-supplied buffer is used.
+ * Same as ip4addr_ntoa, but reentrant since a user-supplied buffer is used.
  *
  * @param addr ip address in network order to convert
  * @param buf target buffer where the string is stored