linux: add -fvisibility=hidden to build flags

webkit/tools/npapi_layout_test_plugin/main.cpp

 /*
  IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc. ("Apple") in
  consideration of your agreement to the following terms, and your use, installation,
  modification or redistribution of this Apple software constitutes acceptance of these
  terms.  If you do not agree with these terms, please do not use, install, modify or
  redistribute this Apple software.
 
  In consideration of your agreement to abide by the following terms, and subject to these
  terms, Apple grants you a personal, non-exclusive license, under Apple’s copyrights in
  this original Apple software (the "Apple Software"), to use, reproduce, modify and
@@ skipping 25 matching lines @@
 #include <wtf/Platform.h>
 #include "PluginObject.h"
 
 #ifdef WIN32
 #define strcasecmp _stricmp
 #define NPAPI WINAPI
 #else
 #define NPAPI
 #endif
 
+#if defined(__GNUC__) && __GNUC__ >= 4
+#define EXPORT __attribute__((visibility ("default")))
+#else
+#define EXPORT
+#endif
+
 #if defined(OS_LINUX)
 #include <X11/Xlib.h>
 #endif
 
 static void log(NPP instance, const char* format, ...)
 {
     va_list args;
     va_start(args, format);
     char message[2048] = "PLUGIN: ";
     vsprintf(message + strlen(message), format, args);
@@ skipping 26 matching lines @@
         return;
     }
 
     browser->releasevariantvalue(&result);
     browser->releaseobject(consoleObject);
     browser->releaseobject(windowObject);
 }
 
 // Plugin entry points
 extern "C" {
-    NPError NPAPI NP_Initialize(NPNetscapeFuncs *browserFuncs
+    EXPORT NPError NPAPI NP_Initialize(NPNetscapeFuncs *browserFuncs
 #if defined(OS_LINUX)
                                 , NPPluginFuncs *pluginFuncs
 #endif
                                 );
-    NPError NPAPI NP_GetEntryPoints(NPPluginFuncs *pluginFuncs);
-    void NPAPI NP_Shutdown(void);
+    EXPORT NPError NPAPI NP_GetEntryPoints(NPPluginFuncs *pluginFuncs);
+    EXPORT void NPAPI NP_Shutdown(void);
 
 #if defined(OS_LINUX)
-    NPError NP_GetValue(NPP instance, NPPVariable variable, void *value);
-    const char* NP_GetMIMEDescription(void);
+    EXPORT NPError NPAPI NP_GetValue(NPP instance, NPPVariable variable, void *value);
+    EXPORT const char* NPAPI NP_GetMIMEDescription(void);
 #endif
 }
 
 // Plugin entry points
-NPError NPAPI NP_Initialize(NPNetscapeFuncs *browserFuncs
+EXPORT NPError NPAPI NP_Initialize(NPNetscapeFuncs *browserFuncs
 #if defined(OS_LINUX)
                             , NPPluginFuncs *pluginFuncs
 #endif
 )
 {
     browser = browserFuncs;
 #if defined(OS_LINUX)
     return NP_GetEntryPoints(pluginFuncs);
 #else
     return NPERR_NO_ERROR;
 #endif
 }
 
-NPError NPAPI NP_GetEntryPoints(NPPluginFuncs *pluginFuncs)
+EXPORT NPError NPAPI NP_GetEntryPoints(NPPluginFuncs *pluginFuncs)
 {
     pluginFuncs->version = 11;
     pluginFuncs->size = sizeof(pluginFuncs);
     pluginFuncs->newp = NPP_New;
     pluginFuncs->destroy = NPP_Destroy;
     pluginFuncs->setwindow = NPP_SetWindow;
     pluginFuncs->newstream = NPP_NewStream;
     pluginFuncs->destroystream = NPP_DestroyStream;
     pluginFuncs->asfile = NPP_StreamAsFile;
     pluginFuncs->writeready = NPP_WriteReady;
     pluginFuncs->write = (NPP_WriteProcPtr)NPP_Write;
     pluginFuncs->print = NPP_Print;
     pluginFuncs->event = NPP_HandleEvent;
     pluginFuncs->urlnotify = NPP_URLNotify;
     pluginFuncs->getvalue = NPP_GetValue;
     pluginFuncs->setvalue = NPP_SetValue;
 
     return NPERR_NO_ERROR;
 }
 
-void NPAPI NP_Shutdown(void)
+EXPORT void NPAPI NP_Shutdown(void)
 {
 }
 
 static void executeScript(const PluginObject* obj, const char* script);
 
 NPError NPP_New(NPMIMEType pluginType, NPP instance, uint16 mode, int16 argc, char *argn[], char *argv[], NPSavedData *saved)
 {
     if (browser->version >= 14) {
         PluginObject* obj = (PluginObject*)browser->createobject(instance, getPluginClass());
 
@@ skipping 338 matching lines @@
 
     return err;
 }
 
 NPError NPP_SetValue(NPP instance, NPNVariable variable, void *value)
 {
     return NPERR_GENERIC_ERROR;
 }
 
 #if defined(OS_LINUX)
-NPError NP_GetValue(NPP instance, NPPVariable variable, void *value)
+EXPORT NPError NPAPI NP_GetValue(NPP instance, NPPVariable variable, void *value)
 {
     return NPP_GetValue(instance, variable, value);
 }
 
-const char* NP_GetMIMEDescription(void) {
+EXPORT const char* NPAPI NP_GetMIMEDescription(void) {
     // The layout test LayoutTests/fast/js/navigator-mimeTypes-length.html
     // asserts that the number of mimetypes handled by plugins should be
     // greater than the number of plugins.  This isn't true if we're
     // the only plugin and we only handle one mimetype, so specify
     // multiple mimetypes here.
     return "application/x-webkit-test-netscape:testnetscape:test netscape content;"
            "application/x-webkit-test-netscape2:testnetscape2:test netscape content2";
 }
 #endif