lto-streamer-out.c (write_symbol): Fix visibilities of external references.

	* lto-streamer-out.c (write_symbol): Fix visibilities of external
	references.

From-SVN: r162497

gcc/ChangeLog

+2010-07-23  Jan Hubicka  <jh@suse.cz>
+
+	* lto-streamer-out.c (write_symbol): Fix visibilities of external
+	references.
+
 2010-07-23  Le-Chun Wu  <lcwu@google.com>
 
 	* omega.c (omega_eliminate_redundant): Remove a self-assign statement.

gcc/lto-streamer-out.c

@@ -2352,6 +2352,17 @@ write_symbol (struct lto_streamer_cache_d *cache,
 		      && cgraph_get_node (t)->analyzed));
     }
 
+  /* Imitate what default_elf_asm_output_external do.
+     When symbol is external, we need to output it with DEFAULT visibility
+     when compiling with -fvisibility=default, while with HIDDEN visibility
+     when symbol has attribute (visibility("hidden")) specified.
+     targetm.binds_local_p check DECL_VISIBILITY_SPECIFIED and gets this
+     right. */
+     
+  if (DECL_EXTERNAL (t)
+      && !targetm.binds_local_p (t))
+    visibility = GCCPV_DEFAULT;
+  else
     switch (DECL_VISIBILITY(t))
       {
       case VISIBILITY_DEFAULT: