re PR middle-end/48044 (ICE in function_and_variable_visibility, at ipa.c:875)

	PR middle-end/48044
	* ipa.c (cgraph_remove_unreachable_nodes): Enqueue
	all vnode->force_output nodes as needed.

	* gcc.dg/torture/pr48044.c: New test.

From-SVN: r170873

gcc/ChangeLog

+2011-03-11  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/48044
+	* ipa.c (cgraph_remove_unreachable_nodes): Enqueue
+	all vnode->force_output nodes as needed.
+
 2011-03-11  Jason Merrill  <jason@redhat.com>
 
 	PR c++/48069

gcc/ipa.c

 /* Basic IPA optimizations and utilities.
-   Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010
+   Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
    Free Software Foundation, Inc.
 
 This file is part of GCC.
@@ -259,7 +259,7 @@ cgraph_remove_unreachable_nodes (bool before_inlining_p, FILE *file)
     {
       vnode->next_needed = NULL;
       vnode->prev_needed = NULL;
-      if (vnode->analyzed
+      if ((vnode->analyzed || vnode->force_output)
 	  && !varpool_can_remove_if_no_refs (vnode))
 	{
 	  vnode->needed = false;

gcc/testsuite/ChangeLog

+2011-03-11  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/48044
+	* gcc.dg/torture/pr48044.c: New test.
+
 2011-03-11  Janus Weil  <janus@gcc.gnu.org>
 
 	PR fortran/47768

gcc/testsuite/gcc.dg/torture/pr48044.c

+/* PR middle-end/48044 */
+/* { dg-do compile } */
+/* { dg-require-alias "" } */
+
+int a __asm__ ("b") = 0;
+extern int c __asm__ ("a") __attribute__ ((alias ("b")));
+extern int d __attribute__ ((weak, alias ("a")));