linux: unexport as many symbols as possible

plugin/cross/main.cc

 /*
  * 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 130 matching lines @@
   return NPERR_GENERIC_ERROR;
 }
 }  // namespace o3d
 
 #if defined(O3D_INTERNAL_PLUGIN)
 namespace o3d {
 #else
 extern "C" {
 #endif
 
-NPError OSCALL NP_GetEntryPoints(NPPluginFuncs *pluginFuncs) {
+NPError EXPORT_SYMBOL OSCALL NP_GetEntryPoints(NPPluginFuncs *pluginFuncs) {
   HANDLE_CRASHES;
   pluginFuncs->version = 11;
   pluginFuncs->size = sizeof(*pluginFuncs);
   pluginFuncs->newp = o3d::NPP_New;
   pluginFuncs->destroy = o3d::NPP_Destroy;
   pluginFuncs->setwindow = o3d::NPP_SetWindow;
   pluginFuncs->newstream = o3d::NPP_NewStream;
   pluginFuncs->destroystream = o3d::NPP_DestroyStream;
   pluginFuncs->asfile = o3d::NPP_StreamAsFile;
   pluginFuncs->writeready = o3d::NPP_WriteReady;
   pluginFuncs->write = o3d::NPP_Write;
   pluginFuncs->print = o3d::NPP_Print;
   pluginFuncs->event = o3d::NPP_HandleEvent;
   pluginFuncs->urlnotify = o3d::NPP_URLNotify;
   pluginFuncs->getvalue = o3d::NPP_GetValue;
   pluginFuncs->setvalue = o3d::NPP_SetValue;
 
   return NPERR_NO_ERROR;
 }
 
-char *NP_GetMIMEDescription(void) {
+char * EXPORT_SYMBOL NP_GetMIMEDescription(void) {
   return O3D_PLUGIN_MIME_TYPE "::O3D MIME";
 }
 
 }  // namespace o3d / extern "C"
 
 #if !defined(O3D_INTERNAL_PLUGIN)
 extern "C" {
-NPError NP_GetValue(void *instance, NPPVariable variable, void *value) {
+NPError EXPORT_SYMBOL NP_GetValue(void *instance, NPPVariable variable,
+                                  void *value) {
   return o3d::NP_GetValue(instance, variable, value);
 }
 }
 #endif