re PR plugins/44459 (plugin interface depends on name mangling)

PR plugins/44459:
	* gcc-plugin.h: Encapsulate all declarations in extern "C".

From-SVN: r160448

gcc/ChangeLog

@@ -1,3 +1,8 @@
+2010-06-09  Joern Rennecke  <joern.rennecke@embecosm.com>
+
+	PR plugins/44459:
+	* gcc-plugin.h: Encapsulate all declarations in extern "C".
+
 2010-06-08  Jan Hubicka  <jh@suse.cz>
 
 	* basic-block.h (single_succ_edge, single_pred_edge, ei_container,

gcc/gcc-plugin.h

@@ -38,6 +38,12 @@ enum plugin_event
   PLUGIN_EVENT_FIRST_DYNAMIC
 };
 
+/* All globals declared here have C linkage to reduce link compatibility
+   issues with implementation language choice and mangling.  */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 extern const char **plugin_event_name;
 
 struct plugin_argument
@@ -96,16 +102,10 @@ extern bool plugin_default_version_check (struct plugin_gcc_version *,
 typedef int (*plugin_init_func) (struct plugin_name_args *plugin_info,
                                  struct plugin_gcc_version *version);
 
-#ifdef __cplusplus
-extern "C" {
-#endif
 /* Declaration for "plugin_init" function so that it doesn't need to be
    duplicated in every plugin.  */
 extern int plugin_init (struct plugin_name_args *plugin_info,
                         struct plugin_gcc_version *version);
-#ifdef __cplusplus
-}
-#endif
 
 /* Function type for a plugin callback routine.
 
@@ -147,4 +147,8 @@ extern int unregister_callback (const char *plugin_name, int event);
    -iplugindir program argument to cc1.  */
 extern const char* default_plugin_dir_name (void);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* GCC_PLUGIN_H */