From: Jan Hubicka <hubicka@ucw.cz>
Date: Tue, 8 Dec 2015 22:01:41 +0000 (+0100)
Subject: re PR lto/61886 (LTO breaks fread with _FORTIFY_SOURCE=2)
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=ced7e9584b848a8d5975b23efb5eac04ee2aee6f;p=gcc.git

re PR lto/61886 (LTO breaks fread with _FORTIFY_SOURCE=2)


	PR ipa/61886
	* ipa-visibility.c (can_replace_by_local_alias): Look through transparent
	aliaes; refuse weakrefs.
	(update_visibility_by_resolution_info): Skip transparent aliases in the
	analysis part

From-SVN: r231428
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index e4c720774dd..8554091625c 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,11 @@
+2015-12-08  Jan Hubicka  <hubicka@ucw.cz>
+
+	PR ipa/61886
+	* ipa-visibility.c (can_replace_by_local_alias): Look through transparent
+	aliaes; refuse weakrefs.
+	(update_visibility_by_resolution_info): Skip transparent aliases in the
+	analysis part
+
 2015-12-08  Jan Hubicka  <hubicka@ucw.cz>
 
 	PR ipa/61886
diff --git a/gcc/ipa-visibility.c b/gcc/ipa-visibility.c
index 0423f242af0..5b03159197c 100644
--- a/gcc/ipa-visibility.c
+++ b/gcc/ipa-visibility.c
@@ -332,6 +332,13 @@ varpool_node::externally_visible_p (void)
 bool
 can_replace_by_local_alias (symtab_node *node)
 {
+  /* Weakrefs have a reason to be non-local.  Be sure we do not replace
+     them.  */
+  while (node->transparent_alias && node->definition && !node->weakref)
+    node = node->get_alias_target ();
+  if (node->weakref)
+    return false;
+  
   return (node->get_availability () > AVAIL_INTERPOSABLE
 	  && !decl_binds_to_current_def_p (node->decl)
 	  && !node->can_be_discarded_p ());
@@ -392,7 +399,7 @@ update_visibility_by_resolution_info (symtab_node * node)
     for (symtab_node *next = node->same_comdat_group;
 	 next != node; next = next->same_comdat_group)
       {
-	if (!next->externally_visible)
+	if (!next->externally_visible || next->transparent_alias)
 	  continue;
 
 	bool same_def