Redo opennurbs_defines to match PCLs structure for both windows and linux. But still use OPENNURBS_EXPORTS as it was used multiple places.

Author: larshg

surface/include/pcl/surface/3rdparty/opennurbs/opennurbs_defines.h

@@ -61,63 +61,51 @@
 //
 */
 
-#if defined(OPENNURBS_EXPORTS)
-// OPENNURBS_EXPORTS is Microsoft's prefered defined for building an opennurbs DLL.
-#if !defined(ON_DLL_EXPORTS)
-#define ON_DLL_EXPORTS
-#endif
-#if !defined(ON_COMPILING_OPENNURBS)
-#define ON_COMPILING_OPENNURBS
-#endif
-#endif
-
-#if defined(OPENNURBS_IMPORTS)
-// OPENNURBS_EXPORTS is Microsoft's prefered defined for linking with an opennurbs DLL.
-#if !defined(ON_DLL_IMPORTS)
-#define ON_DLL_IMPORTS
-#endif
-#endif
-
-#if defined(ON_DLL_EXPORTS) && defined(ON_DLL_IMPORTS)
-#error At most one of ON_DLL_EXPORTS and ON_DLL_IMPORTS can be defined.
-#endif
+#ifdef PCL_STATIC_DEFINE
 
-/* export/import */
-#if defined(ON_DLL_EXPORTS)
+/* compiling or using OpenNurbs as a static library */
+#define ON_CLASS
+#define ON_DECL
+#define ON_EXTERN_DECL
 
-#if !defined(ON_COMPILING_OPENNURBS)
-#error When compiling an OpenNURBS DLL, ON_DLL_EXPORTS must be defined
+#if defined(ON_DLL_TEMPLATE)
+#undef ON_DLL_TEMPLATE
 #endif
 
-/* compiling OpenNurbs as a Windows DLL - export classes, functions, templates, and globals */
+#else
+#if defined WIN32 || defined _WIN32 || defined WINCE || defined __MINGW32__
+#ifdef OPENNURBS_EXPORTS
+/* compiling OpenNurbs as a Windows DLL - export classes, functions, templates, and
+ * globals */
 #define ON_CLASS __declspec(dllexport)
 #define ON_DECL __declspec(dllexport)
 #define ON_EXTERN_DECL __declspec(dllexport)
 #define ON_DLL_TEMPLATE
-
-#elif defined(ON_DLL_IMPORTS)
-
-#if defined(ON_COMPILING_OPENNURBS)
-#error When compiling an OpenNURBS DLL, ON_DLL_IMPORTS must NOT be defined
-#endif
-
-/* using OpenNurbs as a Windows DLL - import classes, functions, templates, and globals */
+#define ON_DLL_EXPORTS
+#else
+/* using OpenNurbs as a Windows DLL - import classes, functions, templates, and globals
+ */
 #define ON_CLASS __declspec(dllimport)
 #define ON_DECL __declspec(dllimport)
 #define ON_EXTERN_DECL __declspec(dllimport)
 #define ON_DLL_TEMPLATE extern
-
+#define ON_DLL_IMPORTS
+#endif
+#else
+#ifdef PCL_SYMBOL_VISIBILITY_HIDDEN
+#define ON_CLASS __attribute__((visibility("default")))
+#define ON_DECL __attribute__((visibility("default")))
+#define ON_EXTERN_DECL __attribute__((visibility("default")))
+#define ON_DLL_TEMPLATE
+#define ON_DLL_EXPORTS
 #else
-
-/* compiling or using OpenNurbs as a static library */
 #define ON_CLASS
 #define ON_DECL
 #define ON_EXTERN_DECL
-
-#if defined(ON_DLL_TEMPLATE)
-#undef ON_DLL_TEMPLATE
+#define ON_DLL_TEMPLATE
+#define ON_DLL_EXPORTS
+#endif
 #endif
-
 #endif