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

ports/linux/bacport.h

@@ -99,10 +99,12 @@
 #include <sys/un.h>
 #include <sys/ioctl.h>
 #include <netdb.h>
+#include "bacnet/bacnet_stack_exports.h"
 
 /** @file linux/net.h  Includes Linux network headers. */
 
 /* Local helper functions for this port */
+BACNET_STACK_EXPORT
 extern int bip_get_local_netmask(
     struct in_addr *netmask);
 

ports/linux/dlmstp_linux.h

@@ -32,6 +32,7 @@
 #include <stdbool.h>
 #include <stdint.h>
 #include <stddef.h>
+#include "bacnet/bacnet_stack_exports.h"
 #include "bacnet/bacdef.h"
 #include "bacnet/npdu.h"
 #include <termios.h>
@@ -127,15 +128,19 @@ typedef struct shared_mstp_data {
 extern "C" {
 #endif /* __cplusplus */
 
+    BACNET_STACK_EXPORT
     bool dlmstp_init(
         void *poShared,
         char *ifname);
+    BACNET_STACK_EXPORT
     void dlmstp_reset(
         void *poShared);
+    BACNET_STACK_EXPORT
     void dlmstp_cleanup(
         void *poShared);
 
     /* returns number of bytes sent on success, negative on failure */
+    BACNET_STACK_EXPORT
     int dlmstp_send_pdu(
         void *poShared,
         BACNET_ADDRESS * dest,  /* destination address */
@@ -143,6 +148,7 @@ extern "C" {
         unsigned pdu_len);      /* number of bytes of data */
 
     /* returns the number of octets in the PDU, or zero on failure */
+    BACNET_STACK_EXPORT
     uint16_t dlmstp_receive(
         void *poShared,
         BACNET_ADDRESS * src,   /* source address */
@@ -157,9 +163,11 @@ extern "C" {
     /* nodes. This may be used to allocate more or less of the available link */
     /* bandwidth to particular nodes. If Max_Info_Frames is not writable in a */
     /* node, its value shall be 1. */
+    BACNET_STACK_EXPORT
     void dlmstp_set_max_info_frames(
         void *poShared,
         uint8_t max_info_frames);
+    BACNET_STACK_EXPORT
     uint8_t dlmstp_max_info_frames(
         void *poShared);
 
@@ -168,36 +176,46 @@ extern "C" {
     /* allowable address for master nodes. The value of Max_Master shall be */
     /* less than or equal to 127. If Max_Master is not writable in a node, */
     /* its value shall be 127. */
+    BACNET_STACK_EXPORT
     void dlmstp_set_max_master(
         void *poShared,
         uint8_t max_master);
+    BACNET_STACK_EXPORT
     uint8_t dlmstp_max_master(
         void *poShared);
 
     /* MAC address 0-127 */
+    BACNET_STACK_EXPORT
     void dlmstp_set_mac_address(
         void *poShared,
         uint8_t my_address);
+    BACNET_STACK_EXPORT
     uint8_t dlmstp_mac_address(
         void *poShared);
 
+    BACNET_STACK_EXPORT
     void dlmstp_get_my_address(
         void *poShared,
         BACNET_ADDRESS * my_address);
+    BACNET_STACK_EXPORT
     void dlmstp_get_broadcast_address(
         BACNET_ADDRESS * dest); /* destination address */
 
     /* RS485 Baud Rate 9600, 19200, 38400, 57600, 115200 */
+    BACNET_STACK_EXPORT
     void dlmstp_set_baud_rate(
         void *poShared,
         uint32_t baud);
+    BACNET_STACK_EXPORT
     uint32_t dlmstp_baud_rate(
         void *poShared);
 
+    BACNET_STACK_EXPORT
     void dlmstp_fill_bacnet_address(
         BACNET_ADDRESS * src,
         uint8_t mstp_address);
 
+    BACNET_STACK_EXPORT
     bool dlmstp_sole_master(
         void);
 

ports/linux/rs485.h

@@ -37,36 +37,47 @@
 #define RS485_H
 
 #include <stdint.h>
+#include "bacnet/bacnet_stack_exports.h"
 #include "bacnet/datalink/mstp.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif /* __cplusplus */
 
+    BACNET_STACK_EXPORT
     void RS485_Set_Interface(
         char *ifname);
+    BACNET_STACK_EXPORT
     const char *RS485_Interface(
         void);
 
+    BACNET_STACK_EXPORT
     void RS485_Initialize(
         void);
 
+    BACNET_STACK_EXPORT
     void RS485_Send_Frame(
         volatile struct mstp_port_struct_t *mstp_port,  /* port specific data */
         uint8_t * buffer,       /* frame to send (up to 501 bytes of data) */
         uint16_t nbytes);       /* number of bytes of data (up to 501) */
 
+    BACNET_STACK_EXPORT
     void RS485_Check_UART_Data(
         volatile struct mstp_port_struct_t *mstp_port); /* port specific data */
+    BACNET_STACK_EXPORT
     uint32_t RS485_Get_Port_Baud_Rate(
         volatile struct mstp_port_struct_t *mstp_port);
+    BACNET_STACK_EXPORT
     uint32_t RS485_Get_Baud_Rate(
         void);
+    BACNET_STACK_EXPORT
     bool RS485_Set_Baud_Rate(
         uint32_t baud);
 
+    BACNET_STACK_EXPORT
     void RS485_Cleanup(
         void);
+    BACNET_STACK_EXPORT
     void RS485_Print_Ports(
         void);