Added missing U/UL modifiers to fix 16-bit-arch portability.

src/include/ipv4/lwip/ip.h

@@ -122,10 +122,10 @@ struct ip_hdr {
   PACK_STRUCT_FIELD(u16_t _id);
   /* fragment offset field */
   PACK_STRUCT_FIELD(u16_t _offset);
-#define IP_RF 0x8000        /* reserved fragment flag */
-#define IP_DF 0x4000        /* dont fragment flag */
-#define IP_MF 0x2000        /* more fragments flag */
-#define IP_OFFMASK 0x1fff   /* mask for fragmenting bits */
+#define IP_RF 0x8000U        /* reserved fragment flag */
+#define IP_DF 0x4000U        /* dont fragment flag */
+#define IP_MF 0x2000U        /* more fragments flag */
+#define IP_OFFMASK 0x1fffU   /* mask for fragmenting bits */
   /* time to live */
   PACK_STRUCT_FIELD(u8_t _ttl);
   /* protocol*/

src/include/lwip/tcp.h

@@ -228,7 +228,7 @@ struct tcp_pcb {
   u16_t acked;
   
   u16_t snd_buf;   /* Available buffer space for sending (in bytes). */
-#define TCP_SNDQUEUELEN_OVERFLOW (0xffff-3)
+#define TCP_SNDQUEUELEN_OVERFLOW (0xffffU-3)
   u16_t snd_queuelen; /* Available buffer space for sending (in tcp_segs). */
 
 #if TCP_OVERSIZE

src/include/netif/etharp.h

@@ -134,11 +134,11 @@ PACK_STRUCT_END
 /** 5 seconds period */
 #define ARP_TMR_INTERVAL 5000
 
-#define ETHTYPE_ARP       0x0806
-#define ETHTYPE_IP        0x0800
-#define ETHTYPE_VLAN      0x8100
-#define ETHTYPE_PPPOEDISC 0x8863  /* PPP Over Ethernet Discovery Stage */
-#define ETHTYPE_PPPOE     0x8864  /* PPP Over Ethernet Session Stage */
+#define ETHTYPE_ARP       0x0806U
+#define ETHTYPE_IP        0x0800U
+#define ETHTYPE_VLAN      0x8100U
+#define ETHTYPE_PPPOEDISC 0x8863U  /* PPP Over Ethernet Discovery Stage */
+#define ETHTYPE_PPPOE     0x8864U  /* PPP Over Ethernet Session Stage */
 
 /** MEMCPY-like macro to copy to/from struct eth_addr's that are local variables
  * or known to be 32-bit aligned within the protocol header. */