Minor changes (but in lot of files): add #if/#endif for options where they could miss. #if LWIP_xxx if always put after #include "lwip/opt.h" (note this one indirectly include cc.h). Move others includes inside #if/#endif block.

src/core/ipv6/icmp6.c

@@ -35,15 +35,14 @@
 
 #include "lwip/opt.h"
 
+#if LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
+
 #include "lwip/icmp.h"
 #include "lwip/inet.h"
 #include "lwip/ip.h"
 #include "lwip/def.h"
-
 #include "lwip/stats.h"
 
-#if LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
-
 void
 icmp_input(struct pbuf *p, struct netif *inp)
 {

src/core/ipv6/ip6_addr.c

@@ -34,7 +34,6 @@
 #include "lwip/ip_addr.h"
 #include "lwip/inet.h"
 
-
 u8_t
 ip_addr_netcmp(struct ip_addr *addr1, struct ip_addr *addr2,
                 struct ip_addr *mask)