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/indtext.h

@@ -27,6 +27,7 @@
 #include <stdbool.h>
 #include <stdint.h>
 #include <string.h>
+#include "bacnet/bacnet_stack_exports.h"
 
 /* index and text pairs */
 typedef const struct {
@@ -43,33 +44,39 @@ extern "C" {
     If the string is not found, false is returned
     If the string is found, true is returned and the found_index contains
     the first index where the string was found. */
+    BACNET_STACK_EXPORT
     bool indtext_by_string(
         INDTEXT_DATA * data_list,
         const char *search_name,
         unsigned *found_index);
 /* case insensitive version */
+    BACNET_STACK_EXPORT
     bool indtext_by_istring(
         INDTEXT_DATA * data_list,
         const char *search_name,
         unsigned *found_index);
 /*  Searches for a matching string and returns the index to the string
     or the default_index if the string is not found. */
+    BACNET_STACK_EXPORT
     unsigned indtext_by_string_default(
         INDTEXT_DATA * data_list,
         const char *search_name,
         unsigned default_index);
 /* case insensitive version */
+    BACNET_STACK_EXPORT
     unsigned indtext_by_istring_default(
         INDTEXT_DATA * data_list,
         const char *search_name,
         unsigned default_index);
 /* for a given index, return the matching string,
    or NULL if not found */
+    BACNET_STACK_EXPORT
     const char *indtext_by_index(
         INDTEXT_DATA * data_list,
         unsigned index);
 /* for a given index, return the matching string,
    or default_name if not found */
+    BACNET_STACK_EXPORT
     const char *indtext_by_index_default(
         INDTEXT_DATA * data_list,
         unsigned index,
@@ -78,6 +85,7 @@ extern "C" {
    or default_name if not found.
    if the index is before the split,
    the before_split_default_name is used */
+    BACNET_STACK_EXPORT
     const char *indtext_by_index_split_default(
         INDTEXT_DATA * data_list,
         unsigned index,
@@ -86,6 +94,7 @@ extern "C" {
         const char *default_name);
 
 /* returns the number of elements in the list */
+    BACNET_STACK_EXPORT
     unsigned indtext_count(
         INDTEXT_DATA * data_list);
 
@@ -98,6 +107,7 @@ extern "C" {
 
 #ifdef TEST
 #include "ctest.h"
+    BACNET_STACK_EXPORT
     void testIndexText(
         Test * pTest);
 #endif