API visibility support (GCC/SUNCC) (FSCORE-264)

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@12061 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/libteletone/src/libteletone.h

@@ -110,6 +110,12 @@ typedef __int16 int16_t;
 #define teletone_assert(expr) assert(expr)
 #endif
 
+#if (defined(__GNUC__) || defined(__SUNCC__)) && defined(HAVE_VISIBILITY)
+#define TELETONE_API __attribute__((visibility("default")))
+#else
+#define TELETONE_API
+#endif
+
 #include <libteletone_generate.h>
 #include <libteletone_detect.h>