Change CoMISoDefines.hh to only export symbols if COMISODLL is defined (same...

Change CoMISoDefines.hh to only export symbols if COMISODLL is defined (same behavior as Windows) to allow building CoMISo as static library without exposing its symbols

Config/CoMISoDefines.hh

@@ -33,12 +33,19 @@
 				#define COMISODLLEXPORTONLY __declspec(dllexport)
 			#endif
 		#else		
-			#define COMISODLLEXPORT
-			#define COMISODLLEXPORTONLY
+      #define COMISODLLEXPORT
+      #define COMISODLLEXPORTONLY
 		#endif
-	#else
-		#define COMISODLLEXPORT __attribute__((visibility("default")))
-		#define COMISODLLEXPORTONLY COMISODLLEXPORT
+	#else // non-Windows symbols export:
+    #ifdef COMISODLL
+      // only export symbols if COMISODLL is defined (same behavior as Windows)
+      #define COMISODLLEXPORT __attribute__((visibility("default")))
+      #define COMISODLLEXPORTONLY COMISODLLEXPORT
+    #else // COMISODLL not defined
+      // this allows building CoMISo as static library without exposing its symbols
+      #define COMISODLLEXPORT
+      #define COMISODLLEXPORTONLY
+    #endif // COMISODLL
 	#endif
 #endif