linux: unexport as many symbols as possible

plugin/cross/main.h

 /*
  * Copyright 2009, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 41 matching lines @@
 #include "plugin/cross/o3d_glue.h"
 #include "plugin/cross/config.h"
 #include "plugin/cross/stream_manager.h"
 #include "third_party/nixysa/static_glue/npapi/common.h"
 #include "third_party/nixysa/static_glue/npapi/npn_api.h"
 
 #if defined(O3D_INTERNAL_PLUGIN)
 #define HANDLE_CRASHES void(0)
 #else  // O3D_INTERNAL_PLUGIN
 
+#if defined(OS_LINUX)
+#define EXPORT_SYMBOL __attribute__((visibility ("default")))
+#else
+#define EXPORT_SYMBOL
+#endif
+
 extern ExceptionManager *g_exception_manager;
 
 // BreakpadEnabler is a simple class to keep track of whether or not
 // we're executing code that we want to handle crashes for
 // (when the o3d plugin is running in Firefox, we don't want to handle
 // crashes for the Flash plugin or Firefox, just the o3d code)
 // Create a stack-based instance at the start of each function
 // where crash handling is desired.
 
 #define HANDLE_CRASHES   BreakpadEnabler enabler
@@ skipping 62 matching lines @@
 
 void NPP_StreamAsFile(NPP instance, NPStream *stream, const char *fname);
 
 void NPP_URLNotify(NPP instance,
                    const char *url,
                    NPReason reason,
                    void *notifyData);
 };  // namespace o3d
 
 #endif  // O3D_PLUGIN_CROSS_MAIN_H_