Included patch #5448: include '#ifdef __cplusplus \ extern "C" {' in all header files. Now you can write your application using the lwIP stack in C++ and simply #include the core files. Note I have left out the netif/ppp/*h header files for now, since I don't know which files are included by applications and which are for internal use only.

CHANGELOG

@@ -22,7 +22,14 @@ HISTORY
   * [Enter new changes just after this line - do not remove this line]
 
   ++ New features:
-  2007-05-08 Simon Goldschmidt
+  2007-05-10 Simon Goldschmidt
+  * *.h (except netif/ppp/*.h): Included patch #5448: include '#ifdef __cplusplus
+    \ extern "C" {' in all header files. Now you can write your application using
+    the lwIP stack in C++ and simply #include the core files. Note I have left
+    out the netif/ppp/*h header files for now, since I don't know which files are
+    included by applications and which are for internal use only.
+
+  2007-05-09 Simon Goldschmidt
   * opt.h, *.c/*.h: Included patch #5920: Create define to override C-library
     memcpy. 2 Defines are created: MEMCPY() for normal memcpy, SMEMCPY() for
     situations where some compilers might inline the copy and save a function

src/include/ipv4/lwip/icmp.h

@@ -40,6 +40,10 @@
 #include "lwip/ip_addr.h"
 #include "lwip/netif.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define ICMP_ER 0      /* echo reply */
 #define ICMP_DUR 3     /* destination unreachable */
 #define ICMP_SQ 4      /* source quench */
@@ -108,5 +112,9 @@ PACK_STRUCT_END
 #define ICMPH_TYPE_SET(hdr, type) ((hdr)->_type_code = htons(ICMPH_CODE(hdr) | ((type) << 8)))
 #define ICMPH_CODE_SET(hdr, code) ((hdr)->_type_code = htons((code) | (ICMPH_TYPE(hdr) << 8)))
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* __LWIP_ICMP_H__ */
     

src/include/ipv4/lwip/igmp.h

@@ -38,6 +38,10 @@
 /* IGMP support available? */
 #if defined(LWIP_IGMP) && (LWIP_IGMP > 0)
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* Some routers are not happy with ROUTER ALERT make it defineable, 1 to enable */
 #define USE_ROUTER_ALERT 0
 
@@ -143,6 +147,10 @@ err_t  igmp_ip_output_if( struct pbuf *p, struct ip_addr *src, struct ip_addr *d
 
 void   igmp_send( struct igmp_group *group, u8_t type);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* LWIP_IGMP */
 
 #endif /* IGMPH */

src/include/ipv4/lwip/inet.h

@@ -38,6 +38,10 @@
 #include "lwip/pbuf.h"
 #include "lwip/ip_addr.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 u16_t inet_chksum(void *dataptr, u16_t len);
 #if 0 /* optimized routine */
 u16_t inet_chksum4(u8_t *dataptr, u16_t len);
@@ -80,19 +84,23 @@ char *inet_ntoa(struct in_addr addr); /* returns ptr to static buffer; not reent
 #define ntohs lwip_ntohs
 #define htonl lwip_htonl
 #define ntohl lwip_ntohl
-#endif
+#endif /* LWIP_PREFIX_BYTEORDER_FUNCS */
 #if LWIP_PLATFORM_BYTESWAP
 #define htons(x) LWIP_PLATFORM_HTONS(x)
 #define ntohs(x) LWIP_PLATFORM_HTONS(x)
 #define htonl(x) LWIP_PLATFORM_HTONL(x)
 #define ntohl(x) LWIP_PLATFORM_HTONL(x)
-#else
+#else /* LWIP_PLATFORM_BYTESWAP */
 u16_t htons(u16_t x);
 u16_t ntohs(u16_t x);
 u32_t htonl(u32_t x);
 u32_t ntohl(u32_t x);
-#endif
+#endif /* LWIP_PLATFORM_BYTESWAP */
+
+#endif /* BYTE_ORDER == BIG_ENDIAN */
 
+#ifdef __cplusplus
+}
 #endif
 
 #endif /* __LWIP_INET_H__ */

src/include/ipv4/lwip/ip.h

@@ -41,6 +41,10 @@
 #include "lwip/err.h"
 
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 void ip_init(void);
 struct netif *ip_route(struct ip_addr *dest);
 err_t ip_input(struct pbuf *p, struct netif *inp);
@@ -149,6 +153,10 @@ void ip_debug_print(struct pbuf *p);
 #define ip_debug_print(p)
 #endif /* IP_DEBUG */
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* __LWIP_IP_H__ */
 
 

src/include/ipv4/lwip/ip_addr.h

@@ -34,6 +34,10 @@
 
 #include "lwip/arch.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #ifdef PACK_STRUCT_USE_INCLUDES
 #  include "arch/bpstruct.h"
 #endif
@@ -157,4 +161,8 @@ u8_t ip_addr_isbroadcast(struct ip_addr *, struct netif *);
 #define ip4_addr3(ipaddr) ((u16_t)(ntohl((ipaddr)->addr) >> 8) & 0xff)
 #define ip4_addr4(ipaddr) ((u16_t)(ntohl((ipaddr)->addr)) & 0xff)
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* __LWIP_IP_ADDR_H__ */

src/include/ipv4/lwip/ip_frag.h

@@ -41,6 +41,10 @@
 
 #if (IP_FRAG || IP_REASSEMBLY)
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* The IP timer interval in milliseconds. */
 #define IP_TMR_INTERVAL 1000
 
@@ -49,6 +53,10 @@ void ip_reass_tmr(void);
 struct pbuf * ip_reass(struct pbuf *p);
 err_t ip_frag(struct pbuf *p, struct netif *netif, struct ip_addr *dest);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* IP_FRAG || IP_REASSEMBLY */
 
 #endif /* __LWIP_IP_FRAG_H__ */

src/include/ipv6/lwip/icmp.h

@@ -39,6 +39,10 @@
 
 #include "lwip/netif.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define ICMP6_DUR  1
 #define ICMP6_TE   3
 #define ICMP6_ECHO 128    /* echo */
@@ -86,5 +90,9 @@ struct icmp_te_hdr {
   u32_t unused;
 };
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* __LWIP_ICMP_H__ */
     

src/include/ipv6/lwip/inet.h

@@ -38,6 +38,10 @@
 #include "lwip/pbuf.h"
 #include "lwip/ip_addr.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 u16_t inet_chksum(void *data, u16_t len);
 u16_t inet_chksum_pbuf(struct pbuf *p);
 u16_t inet_chksum_pseudo(struct pbuf *p,
@@ -58,5 +62,9 @@ u32_t ntohl(u32_t n);
 #endif /* _NETINET_IN_H */
 #endif /* _MACHINE_ENDIAN_H_ */
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* __LWIP_INET_H__ */
 

src/include/ipv6/lwip/ip.h

@@ -39,6 +39,10 @@
 
 #include "lwip/err.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define IP_HLEN 40
 
 #define IP_PROTO_ICMP 58
@@ -104,6 +108,10 @@ err_t ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
 void ip_debug_print(struct pbuf *p);
 #endif /* IP_DEBUG */
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* __LWIP_IP_H__ */
 
 

src/include/ipv6/lwip/ip_addr.h

@@ -34,6 +34,10 @@
 
 #include "lwip/arch.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define IP_ADDR_ANY 0
 
 #ifdef PACK_STRUCT_USE_INCLUDES
@@ -86,4 +90,8 @@ u8_t ip_addr_isany(struct ip_addr *addr);
          (ntohl(ipaddr->addr[3]) >> 16) & 0xffff, \
          ntohl(ipaddr->addr[3]) & 0xffff));
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* __LWIP_IP_ADDR_H__ */

src/include/lwip/api.h

@@ -44,6 +44,10 @@
 
 #include "lwip/err.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define NETCONN_NOCOPY 0x00
 #define NETCONN_COPY   0x01
 
@@ -173,6 +177,8 @@ err_t             netconn_join_leave_group (struct netconn *conn,
 
 err_t             netconn_err     (struct netconn *conn);
 
-#endif /* __LWIP_API_H__ */
+#ifdef __cplusplus
-
+}
+#endif
 
+#endif /* __LWIP_API_H__ */

src/include/lwip/api_msg.h

@@ -43,6 +43,10 @@
 
 #include "lwip/api.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 enum api_msg_type {
   API_MSG_NEWCONN,
   API_MSG_DELCONN,
@@ -94,5 +98,8 @@ struct api_msg {
 void  api_msg_input(struct api_msg *msg);
 err_t api_msg_post(struct api_msg *msg);
 
-#endif /* __LWIP_API_MSG_H__ */
+#ifdef __cplusplus
+}
+#endif
 
+#endif /* __LWIP_API_MSG_H__ */

src/include/lwip/arch.h

@@ -42,6 +42,10 @@
 
 #include "arch/cc.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #ifndef PACK_STRUCT_BEGIN
 #define PACK_STRUCT_BEGIN
 #endif /* PACK_STRUCT_BEGIN */
@@ -217,4 +221,8 @@ extern int errno;
 
 #endif /* LWIP_PROVIDE_ERRNO */
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* __LWIP_ARCH_H__ */

src/include/lwip/dhcp.h

@@ -8,6 +8,10 @@
 #include "lwip/netif.h"
 #include "lwip/udp.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /** period (in seconds) of the application calling dhcp_coarse_tmr() */
 #define DHCP_COARSE_TIMER_SECS 60 
 /** period (in milliseconds) of the application calling dhcp_fine_tmr() */
@@ -221,4 +225,8 @@ void dhcp_fine_tmr(void);
 #define DHCP_OVERLOAD_SNAME  2
 #define DHCP_OVERLOAD_SNAME_FILE 3
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /*__LWIP_DHCP_H__*/

src/include/lwip/err.h

@@ -36,6 +36,10 @@
 
 #include "arch/cc.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef s8_t err_t;
 
 /* Definitions for error constants. */
@@ -69,4 +73,9 @@ extern const char *lwip_strerr(err_t err);
 #else
 #define lwip_strerr(x) ""
 #endif /* LWIP_DEBUG */
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* __LWIP_ERR_H__ */

src/include/lwip/mem.h

@@ -35,6 +35,10 @@
 #include "lwip/opt.h"
 #include "lwip/arch.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #if MEM_SIZE > 64000l
 typedef u32_t mem_size_t;
 #define MEM_SIZE_F U32_F
@@ -74,5 +78,8 @@ void *mem_realloc(void *mem, mem_size_t size);
 #define MEM_ALIGN(addr) ((void *)(((mem_ptr_t)(addr) + MEM_ALIGNMENT - 1) & ~(mem_ptr_t)(MEM_ALIGNMENT-1)))
 #endif
 
-#endif /* __LWIP_MEM_H__ */
+#ifdef __cplusplus
+}
+#endif
 
+#endif /* __LWIP_MEM_H__ */

src/include/lwip/memp.h

@@ -35,6 +35,10 @@
 
 #include "lwip/opt.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* If you change this enum, think to update memp_names in stats_display (stats.c) */
 typedef enum {
   MEMP_PBUF,
@@ -60,5 +64,8 @@ void  memp_init(void);
 void *memp_malloc(memp_t type);
 void  memp_free(memp_t type, void *mem);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* __LWIP_MEMP_H__  */
-    

src/include/lwip/netif.h

@@ -44,6 +44,10 @@
 #  include "lwip/dhcp.h"
 #endif
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /** must be the maximum of all used hardware address lengths
     across all types of interfaces in use */
 #define NETIF_MAX_HWADDR_LEN 6U
@@ -183,4 +187,8 @@ u8_t netif_is_up(struct netif *netif);
 void netif_set_status_callback( struct netif *netif, void (* status_callback)(struct netif *netif ));
 #endif /* LWIP_NETIF_CALLBACK */
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* __LWIP_NETIF_H__ */

src/include/lwip/netifapi.h

@@ -35,6 +35,10 @@
 
 #if LWIP_NETIF_API
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 enum netifapi_msg_type {
   NETIFAPI_MSG_NETIF_ADD,
   NETIFAPI_MSG_NETIF_REMOVE,
@@ -82,6 +86,10 @@ err_t netifapi_dhcp_stop   ( struct netif *netif);
 void  netifapi_msg_input(struct netifapi_msg *msg);
 err_t netifapi_msg_post (struct netifapi_msg *msg);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* LWIP_NETIF_API */
 
 #endif /* __LWIP_NETIFAPI_H__ */

src/include/lwip/pbuf.h

@@ -36,6 +36,10 @@
 #include "arch/cc.h"
 #include "lwip/err.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define PBUF_TRANSPORT_HLEN 20
 #define PBUF_IP_HLEN        20
 
@@ -110,4 +114,8 @@ struct pbuf *pbuf_dechain(struct pbuf *p);
 err_t pbuf_copy(struct pbuf *p_to, struct pbuf *p_from);
 #endif
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* __LWIP_PBUF_H__ */

src/include/lwip/raw.h

@@ -38,6 +38,10 @@
 #include "lwip/inet.h"
 #include "lwip/ip.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 struct raw_pcb {
 /* Common members of all PCB types */
   IP_PCB;
@@ -70,5 +74,8 @@ err_t            raw_send       (struct raw_pcb *pcb, struct pbuf *p);
 u8_t              raw_input      (struct pbuf *p, struct netif *inp);
 void             raw_init       (void);
 
+#ifdef __cplusplus
+}
+#endif
 
 #endif /* __LWIP_RAW_H__ */

src/include/lwip/sio.h

@@ -34,6 +34,10 @@
 
 #include "arch/cc.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #ifndef __sio_fd_t_defined
 typedef void * sio_fd_t;
 #endif
@@ -61,3 +65,7 @@ u32_t sio_write(sio_fd_t, u8_t *, u32_t);
 #ifndef sio_read_abort
 void sio_read_abort(sio_fd_t);
 #endif
+
+#ifdef __cplusplus
+}
+#endif

src/include/lwip/snmp.h

@@ -37,6 +37,10 @@
 #include "lwip/netif.h"
 #include "lwip/udp.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* SNMP support available? */
 #if defined(LWIP_SNMP) && (LWIP_SNMP > 0)
 
@@ -310,4 +314,8 @@ void snmp_get_snmpenableauthentraps(u8_t *value);
 
 #endif
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* __LWIP_SNMP_H__ */

src/include/lwip/snmp_asn1.h

@@ -41,6 +41,10 @@
 #include "lwip/pbuf.h"
 #include "lwip/snmp.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define SNMP_ASN1_UNIV   (!0x80 | !0x40)
 #define SNMP_ASN1_APPLIC (!0x80 |  0x40)
 #define SNMP_ASN1_CONTXT ( 0x80 | !0x40)
@@ -87,4 +91,8 @@ err_t snmp_asn1_enc_s32t(struct pbuf *p, u16_t ofs, u8_t octets_needed, s32_t va
 err_t snmp_asn1_enc_oid(struct pbuf *p, u16_t ofs, u8_t ident_len, s32_t *ident);
 err_t snmp_asn1_enc_raw(struct pbuf *p, u16_t ofs, u8_t raw_len, u8_t *raw);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

src/include/lwip/snmp_msg.h

@@ -44,6 +44,10 @@
 #include "private_mib.h"
 #endif
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* The listen port of the SNMP agent. Clients have to make their requests to
    this port. Most standard clients won't work if you change this! */
 #ifndef SNMP_IN_PORT
@@ -297,4 +301,8 @@ err_t snmp_send_trap(s8_t generic_trap, struct snmp_obj_id *eoid, s32_t specific
 void snmp_coldstart_trap(void);
 void snmp_authfail_trap(void);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

src/include/lwip/snmp_structs.h

@@ -47,6 +47,10 @@
 #include "private_mib.h"
 #endif
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* MIB object instance */
 #define MIB_OBJECT_NONE 0 
 #define MIB_OBJECT_SCALAR 1
@@ -249,5 +253,9 @@ struct mib_node* snmp_expand_tree(struct mib_node *node, u8_t ident_len, s32_t *
 u8_t snmp_iso_prefix_tst(u8_t ident_len, s32_t *ident);
 u8_t snmp_iso_prefix_expand(u8_t ident_len, s32_t *ident, struct snmp_obj_id *oidret);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* LWIP_SNMP */
 #endif

src/include/lwip/sockets.h

@@ -33,10 +33,15 @@
 
 #ifndef __LWIP_SOCKETS_H__
 #define __LWIP_SOCKETS_H__
+
 #include "lwip/ip_addr.h"
 #include "opt.h"
 #include "tcp.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 struct sockaddr_in {
   u8_t sin_len;
   u8_t sin_family;
@@ -293,5 +298,8 @@ int lwip_ioctl(int s, long cmd, void *argp);
 
 #endif /* LWIP_COMPAT_SOCKETS */
 
-#endif /* __LWIP_SOCKETS_H__ */
+#ifdef __cplusplus
+}
+#endif
 
+#endif /* __LWIP_SOCKETS_H__ */

src/include/lwip/stats.h

@@ -38,6 +38,10 @@
 #include "lwip/mem.h"
 #include "lwip/memp.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #if LWIP_STATS
 
 #ifndef LWIP_STATS_LARGE
@@ -179,4 +183,8 @@ void stats_display(void);
 #define stats_display()
 #endif /* LWIP_STATS_DISPLAY */
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* __LWIP_STATS_H__ */

src/include/lwip/sys.h

@@ -36,6 +36,9 @@
 
 #include "lwip/opt.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
 
 #if NO_SYS
 
@@ -195,4 +198,8 @@ void sys_arch_unprotect(sys_prot_t pval);
 
 #endif /* SYS_ARCH_PROTECT */
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* __LWIP_SYS_H__ */

src/include/lwip/tcp.h

@@ -42,6 +42,10 @@
 
 #include "lwip/err.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 struct tcp_pcb;
 
 /* Functions for interfacing with TCP: */
@@ -538,7 +542,9 @@ extern struct tcp_pcb *tcp_tmp_pcb;      /* Only used for temporary storage. */
                             npcb->next = NULL; \
                             } while(0)
 #endif /* LWIP_DEBUG */
-#endif /* __LWIP_TCP_H__ */
-
 
+#ifdef __cplusplus
+}
+#endif
 
+#endif /* __LWIP_TCP_H__ */

src/include/lwip/tcpip.h

@@ -36,6 +36,10 @@
 #include "lwip/netifapi.h"
 #include "lwip/pbuf.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 void tcpip_init(void (* tcpip_init_done)(void *), void *arg);
 err_t tcpip_apimsg(struct api_msg *apimsg);
 #if ETHARP_TCPIP_INPUT
@@ -82,5 +86,8 @@ struct tcpip_msg {
   } msg;
 };
 
+#ifdef __cplusplus
+}
+#endif
 
 #endif /* __LWIP_TCPIP_H__ */

src/include/lwip/udp.h

@@ -38,6 +38,10 @@
 #include "lwip/inet.h"
 #include "lwip/ip.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define UDP_HLEN 8
 
 struct udp_hdr {
@@ -101,6 +105,9 @@ void udp_debug_print(struct udp_hdr *udphdr);
 #else
 #define udp_debug_print(udphdr)
 #endif
-#endif /* __LWIP_UDP_H__ */
 
+#ifdef __cplusplus
+}
+#endif
 
+#endif /* __LWIP_UDP_H__ */

src/include/netif/etharp.h

@@ -41,6 +41,10 @@
 #include "lwip/netif.h"
 #include "lwip/ip.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #ifndef ETH_PAD_SIZE
 #define ETH_PAD_SIZE 0
 #endif
@@ -136,4 +140,8 @@ err_t etharp_output(struct netif *netif, struct ip_addr *ipaddr,
 err_t etharp_query(struct netif *netif, struct ip_addr *ipaddr, struct pbuf *q);
 err_t etharp_request(struct netif *netif, struct ip_addr *ipaddr);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* __NETIF_ARP_H__ */

src/include/netif/loopif.h

@@ -35,10 +35,18 @@
 #include "lwip/netif.h"
 #include "lwip/err.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #if !LWIP_LOOPIF_MULTITHREADING
 void loopif_poll(struct netif *netif);
 #endif
 
 err_t loopif_init(struct netif *netif);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* __NETIF_LOOPIF_H__ */

src/include/netif/slipif.h

@@ -36,7 +36,15 @@
 
 #include "lwip/netif.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 err_t slipif_init(struct netif * netif);
+
+#ifdef __cplusplus
+}
+#endif
  
 #endif