SNMP functions are now unconditionally called and defined empty if LWIP_SNMP == 0

This removes a lot of #if #endif cluttering the source code.

src/include/ipv4/lwip/ip.h

@@ -114,8 +114,6 @@ PACK_STRUCT_END
 #define IPH_PROTO_SET(hdr, proto) (hdr)->_ttl_proto = (HTONS((proto) | (IPH_TTL(hdr) << 8)))
 #define IPH_CHKSUM_SET(hdr, chksum) (hdr)->_chksum = (chksum)
 
-
-
 #if IP_DEBUG
 void ip_debug_print(struct pbuf *p);
 #endif /* IP_DEBUG */

src/include/lwip/debug.h

@@ -29,6 +29,8 @@
  * Author: Adam Dunkels <adam@sics.se>
  *
  */
+#error this is the original lwIP debug.h file. do not include
+
 #ifndef __LWIP_DEBUG_H__
 #define __LWIP_DEBUG_H__
 

src/include/lwip/snmp.h

@@ -106,6 +106,24 @@ void snmp_inc_udpoutdatagrams(void);
 /* define everything to be empty */
 #else
 
+/* network interface */
+#define snmp_add_ifinoctets() 
+#define snmp_inc_ifinucastpkts()
+#define snmp_inc_ifinnucastpkts()
+#define snmp_inc_ifindiscards()
+#define snmp_add_ifoutoctets()
+#define snmp_inc_ifoutucastpkts()
+#define snmp_inc_ifoutnucastpkts()
+#define snmp_inc_ifoutdiscards()
+
+/* IP */
+#define snmp_inc_ipinreceives()
+#define snmp_inc_ipindelivers()
+#define snmp_inc_ipindiscards()
+#define snmp_inc_ipoutdiscards()
+#define snmp_inc_ipoutrequests()
+#define snmp_inc_ipunknownprotos()
+
 // ICMP
 #define snmp_inc_icmpinmsgs()
 #define snmp_inc_icmpinerrors() 
@@ -133,7 +151,6 @@ void snmp_inc_udpoutdatagrams(void);
 #define snmp_inc_icmpouttimestampreps()
 #define snmp_inc_icmpoutaddrmasks()
 #define snmp_inc_icmpoutaddrmaskreps()
-
 // TCP
 #define snmp_inc_tcpactiveopens()
 #define snmp_inc_tcppassiveopens()