Export symbols in order to support shared libraries (#54)

* Add BAC_ROUTING compile definition

* Reorder cmake

* Fix OpenSSL support: support both 1.0 and 1.1t pus

* Explicitly export symbols, hidden by default

* Build shared libraries on travis using cmake

* Learn Makefile about static library

* Fix build using mingw with cmake

* Do not cleanup twice or after potential free

src/bacnet/basic/npdu/h_npdu.h

@@ -32,6 +32,7 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include <stdint.h>
+#include "bacnet/bacnet_stack_exports.h"
 #include "bacnet/bacdef.h"
 #include "bacnet/bacenum.h"
 #include "bacnet/apdu.h"
@@ -41,25 +42,31 @@
 extern "C" {
 #endif /* __cplusplus */
 
+    BACNET_STACK_EXPORT
     void npdu_handler(
         BACNET_ADDRESS * src,
         uint8_t * pdu,
         uint16_t pdu_len);
+    BACNET_STACK_EXPORT
     void npdu_handler_cleanup(void);
+    BACNET_STACK_EXPORT
     void npdu_handler_init(
         uint16_t bip_net,
         uint16_t mstp_net);
+    BACNET_STACK_EXPORT
     void npdu_router_handler(
         uint16_t snet,
         BACNET_ADDRESS * src,
         uint8_t * pdu,
         uint16_t pdu_len);
+    BACNET_STACK_EXPORT
     int npdu_router_send_pdu(
         uint16_t dnet,
         BACNET_ADDRESS * dest,
         BACNET_NPDU_DATA * npdu_data,
         uint8_t * pdu,
         unsigned int pdu_len);
+    BACNET_STACK_EXPORT
     void npdu_router_get_my_address(
         uint16_t dnet,
         BACNET_ADDRESS * my_address);

src/bacnet/basic/npdu/h_routed_npdu.h

@@ -32,6 +32,7 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include <stdint.h>
+#include "bacnet/bacnet_stack_exports.h"
 #include "bacnet/bacdef.h"
 #include "bacnet/bacenum.h"
 #include "bacnet/apdu.h"
@@ -40,6 +41,7 @@
 extern "C" {
 #endif /* __cplusplus */
 
+    BACNET_STACK_EXPORT
     void routing_npdu_handler(
         BACNET_ADDRESS * src,
         int *DNET_list,

src/bacnet/basic/npdu/s_router.h

@@ -32,6 +32,7 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include <stdint.h>
+#include "bacnet/bacnet_stack_exports.h"
 #include "bacnet/bacapp.h"
 #include "bacnet/bacdef.h"
 #include "bacnet/bacenum.h"
@@ -41,27 +42,34 @@
 extern "C" {
 #endif /* __cplusplus */
 
+    BACNET_STACK_EXPORT
     void npdu_encode_npdu_network(
         BACNET_NPDU_DATA *npdu_data,
         BACNET_NETWORK_MESSAGE_TYPE network_message_type,
         bool data_expecting_reply,
         BACNET_MESSAGE_PRIORITY priority);
+    BACNET_STACK_EXPORT
     int Send_Network_Layer_Message(
         BACNET_NETWORK_MESSAGE_TYPE network_message_type,
         BACNET_ADDRESS * dst,
         int *iArgs);
+    BACNET_STACK_EXPORT
     void Send_Who_Is_Router_To_Network(
         BACNET_ADDRESS * dst,
         int dnet);
+    BACNET_STACK_EXPORT
     void Send_I_Am_Router_To_Network(
         const int DNET_list[]);
+    BACNET_STACK_EXPORT
     void Send_Reject_Message_To_Network(
         BACNET_ADDRESS * dst,
         uint8_t reject_reason,
         int dnet);
+    BACNET_STACK_EXPORT
     void Send_Initialize_Routing_Table(
         BACNET_ADDRESS * dst,
         const int DNET_list[]);
+    BACNET_STACK_EXPORT
     void Send_Initialize_Routing_Table_Ack(
         BACNET_ADDRESS * dst,
         const int DNET_list[]);