Fixed multiple smaller compiler warnings

src/include/lwip/arch.h

@@ -64,6 +64,10 @@ extern "C" {
 #define PACK_STRUCT_END
 #endif /* PACK_STRUCT_END */
 
+#ifndef PACK_STRUCT_STRUCT
+#define PACK_STRUCT_STRUCT
+#endif /* PACK_STRUCT_STRUCT */
+
 #ifndef PACK_STRUCT_FIELD
 #define PACK_STRUCT_FIELD(x) x
 #endif /* PACK_STRUCT_FIELD */

src/include/lwip/dhcp.h

@@ -57,8 +57,6 @@ struct dhcp
   u32_t offered_t0_lease; /* lease period (in seconds) */
   u32_t offered_t1_renew; /* recommended renew time (usually 50% of lease period) */
   u32_t offered_t2_rebind; /* recommended rebind time (usually 66% of lease period)  */
-  /* @todo: LWIP_DHCP_BOOTP_FILE configuration option?
-     integrate with possible TFTP-client for booting? */
 #if LWIP_DHCP_BOOTP_FILE
   ip_addr_t offered_si_addr;
   char boot_file_name[DHCP_FILE_LEN];

src/include/lwip/opt.h

@@ -751,6 +751,13 @@
 #define DHCP_DOES_ARP_CHECK             ((LWIP_DHCP) && (LWIP_ARP))
 #endif
 
+/**
+ * LWIP_DHCP_BOOTP_FILE==1: Store offered_si_addr and boot_file_name.
+ */
+#ifndef LWIP_DHCP_BOOTP_FILE
+#define LWIP_DHCP_BOOTP_FILE            0
+#endif
+
 /*
    ------------------------------------
    ---------- AUTOIP options ----------
@@ -1767,6 +1774,13 @@
 #define PPPOS_SUPPORT                   PPP_SUPPORT
 #endif
 
+/**
+ * LWIP_PPP_API==1: Enable PPP API (in pppapi.c)
+ */
+#ifndef LWIP_PPP_API
+#define LWIP_PPP_API                    0
+#endif
+
 #if PPP_SUPPORT
 
 /**
@@ -1794,13 +1808,6 @@
 #define PPP_IPV6_SUPPORT                0
 #endif
 
-/**
- * LWIP_PPP_API==1: Enable PPP API (in pppapi.c)
- */
-#ifndef LWIP_PPP_API
-#define LWIP_PPP_API                    0
-#endif
-
 /**
  * PPP_NOTIFY_PHASE==1: Support PPP notify phase support
  *

src/include/lwip/pbuf.h

@@ -156,7 +156,7 @@ struct pbuf *pbuf_alloced_custom(pbuf_layer l, u16_t length, pbuf_type type,
                                  struct pbuf_custom *p, void *payload_mem,
                                  u16_t payload_mem_len);
 #endif /* LWIP_SUPPORT_CUSTOM_PBUF */
-void pbuf_realloc(struct pbuf *p, u16_t size); 
+void pbuf_realloc(struct pbuf *p, u16_t size);
 u8_t pbuf_header(struct pbuf *p, s16_t header_size);
 void pbuf_ref(struct pbuf *p);
 u8_t pbuf_free(struct pbuf *p);