Fixed multiple smaller compiler warnings

src/core/ipv4/ip4.c

@@ -552,7 +552,7 @@ ip_input(struct pbuf *p, struct netif *inp)
   if (raw_input(p, inp) == 0)
 #endif /* LWIP_RAW */
   {
-    pbuf_header(p, -iphdr_hlen); /* Move to payload, no check necessary. */
+    pbuf_header(p, -(s16_t)iphdr_hlen); /* Move to payload, no check necessary. */
 
     switch (IPH_PROTO(iphdr)) {
 #if LWIP_UDP

src/core/mem.c

@@ -179,7 +179,7 @@ struct mem {
  * how that space is calculated). */
 #ifndef LWIP_RAM_HEAP_POINTER
 /** the heap. we need one struct mem at the end and some room for alignment */
-u8_t ram_heap[MEM_SIZE_ALIGNED + (2*SIZEOF_STRUCT_MEM) + MEM_ALIGNMENT];
+u8_t ram_heap[MEM_SIZE_ALIGNED + (2U*SIZEOF_STRUCT_MEM) + MEM_ALIGNMENT];
 #define LWIP_RAM_HEAP_POINTER ram_heap
 #endif /* LWIP_RAM_HEAP_POINTER */
 

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/netif/ppp/polarssl/des.c

@@ -40,6 +40,7 @@
  */
 
 #include "lwip/opt.h"
+#if PPP_SUPPORT
 #if LWIP_INCLUDED_POLARSSL_DES
 
 #include "netif/ppp/polarssl/des.h"
@@ -419,4 +420,5 @@ void des_crypt_ecb( des_context *ctx,
     PUT_ULONG_BE( X, output, 4 );
 }
 
+#endif /* PPP_SUPPORT */
 #endif /* LWIP_INCLUDED_POLARSSL_DES */

src/netif/ppp/polarssl/md4.c

@@ -40,6 +40,7 @@
  */
 
 #include "lwip/opt.h"
+#if PPP_SUPPORT
 #if LWIP_INCLUDED_POLARSSL_MD4
 
 #include "netif/ppp/polarssl/md4.h"
@@ -276,4 +277,5 @@ void md4( unsigned char *input, int ilen, unsigned char output[16] )
     md4_finish( &ctx, output );
 }
 
+#endif /* PPP_SUPPORT */
 #endif /* LWIP_INCLUDED_POLARSSL_MD4 */

src/netif/ppp/polarssl/md5.c

@@ -39,6 +39,7 @@
  */
 
 #include "lwip/opt.h"
+#if PPP_SUPPORT
 #if LWIP_INCLUDED_POLARSSL_MD5
 
 #include "netif/ppp/polarssl/md5.h"
@@ -295,4 +296,5 @@ void md5( unsigned char *input, int ilen, unsigned char output[16] )
     md5_finish( &ctx, output );
 }
 
+#endif /* PPP_SUPPORT */
 #endif /* LWIP_INCLUDED_POLARSSL_MD5 */

src/netif/ppp/polarssl/sha1.c

@@ -39,6 +39,7 @@
  */
 
 #include "lwip/opt.h"
+#if PPP_SUPPORT
 #if LWIP_INCLUDED_POLARSSL_SHA1
 
 #include "netif/ppp/polarssl/sha1.h"
@@ -330,4 +331,5 @@ void sha1( unsigned char *input, int ilen, unsigned char output[20] )
     sha1_finish( &ctx, output );
 }
 
+#endif /* PPP_SUPPORT */
 #endif /* LWIP_INCLUDED_POLARSSL_SHA1 */