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/getevent.h

@@ -26,6 +26,7 @@
 
 #include <stdint.h>
 #include <stdbool.h>
+#include "bacnet/bacnet_stack_exports.h"
 #include "bacnet/bacdef.h"
 #include "bacnet/bacenum.h"
 #include "bacnet/timestamp.h"
@@ -55,31 +56,37 @@ typedef int (
 extern "C" {
 #endif /* __cplusplus */
 
+    BACNET_STACK_EXPORT
     int getevent_encode_apdu(
         uint8_t * apdu,
         uint8_t invoke_id,
         BACNET_OBJECT_ID * lastReceivedObjectIdentifier);
 
+    BACNET_STACK_EXPORT
     int getevent_decode_service_request(
         uint8_t * apdu,
         unsigned apdu_len,
         BACNET_OBJECT_ID * object_id);
 
+    BACNET_STACK_EXPORT
     int getevent_ack_encode_apdu_init(
         uint8_t * apdu,
         size_t max_apdu,
         uint8_t invoke_id);
 
+    BACNET_STACK_EXPORT
     int getevent_ack_encode_apdu_data(
         uint8_t * apdu,
         size_t max_apdu,
         BACNET_GET_EVENT_INFORMATION_DATA * get_event_data);
 
+    BACNET_STACK_EXPORT
     int getevent_ack_encode_apdu_end(
         uint8_t * apdu,
         size_t max_apdu,
         bool moreEvents);
 
+    BACNET_STACK_EXPORT
     int getevent_ack_decode_service_request(
         uint8_t * apdu,
         int apdu_len,   /* total length of the apdu */
@@ -88,12 +95,14 @@ extern "C" {
 
 #ifdef TEST
 #include "ctest.h"
+    BACNET_STACK_EXPORT
     int getevent_decode_apdu(
         uint8_t * apdu,
         unsigned apdu_len,
         uint8_t * invoke_id,
         BACNET_OBJECT_ID * lastReceivedObjectIdentifier);
 
+    BACNET_STACK_EXPORT
     int getevent_ack_decode_apdu(
         uint8_t * apdu,
         int apdu_len,   /* total length of the apdu */
@@ -101,9 +110,11 @@ extern "C" {
         BACNET_GET_EVENT_INFORMATION_DATA * get_event_data,
         bool * moreEvents);
 
+    BACNET_STACK_EXPORT
     void testGetEventInformationAck(
         Test * pTest);
 
+    BACNET_STACK_EXPORT
     void testGetEventInformation(
         Test * pTest);