From 62593aed2e6b228ae5b85fb9721b45cc92cce894 Mon Sep 17 00:00:00 2001
From: jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Mon, 23 May 2011 18:12:34 +0000
Subject: [PATCH] 	PR debug/49032
 	* dbxout.c: Include cgraph.h.
 	(dbxout_expand_expr): If a VAR_DECL is TREE_STATIC, not written
 	and without value expr, return NULL if no varpool node exists for
 	it or if it is not needed.
 	* Makefile.in (dbxout.o): Depend on $(CGRAPH_H).

	* gcc.dg/debug/pr49032.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_6-branch@174084 138bc75d-0d04-0410-961f-82ee72b054a4

index 792ca6c..60dcee5 100644
--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -2921,7 +2921,8 @@ optabs.o : optabs.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(RTL_H) \
 dbxout.o : dbxout.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(TREE_H) \
    $(RTL_H) $(FLAGS_H) $(REGS_H) debug.h $(TM_P_H) $(TARGET_H) $(FUNCTION_H) \
    langhooks.h insn-config.h reload.h $(GSTAB_H) xcoffout.h output.h dbxout.h \
-   toplev.h $(DIAGNOSTIC_CORE_H) $(GGC_H) $(OBSTACK_H) $(EXPR_H) gt-dbxout.h
+   toplev.h $(DIAGNOSTIC_CORE_H) $(GGC_H) $(OBSTACK_H) $(EXPR_H) $(CGRAPH_H) \
+   gt-dbxout.h
 debug.o : debug.c debug.h $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(TREE_H)
 sdbout.o : sdbout.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) debug.h \
    $(TREE_H) $(GGC_H) $(RTL_H) $(REGS_H) $(FLAGS_H) insn-config.h \
diff --git a/gcc/dbxout.c b/gcc/dbxout.c
index 3b0cf34..836030d 100644
--- a/gcc/dbxout.c
+++ b/gcc/dbxout.c
@@ -1,7 +1,7 @@
 /* Output dbx-format symbol table information from GNU compiler.
    Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
-   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
-   Free Software Foundation, Inc.
+   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
+   2011 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -91,6 +91,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "langhooks.h"
 #include "obstack.h"
 #include "expr.h"
+#include "cgraph.h"
 
 #ifdef XCOFF_DEBUGGING_INFO
 #include "xcoffout.h"
@@ -2393,6 +2394,20 @@ dbxout_expand_expr (tree expr)
 	 disable debug info for these variables.  */
       if (!targetm.have_tls && DECL_THREAD_LOCAL_P (expr))
 	return NULL;
+      if (TREE_STATIC (expr)
+	  && !TREE_ASM_WRITTEN (expr)
+	  && !DECL_HAS_VALUE_EXPR_P (expr)
+	  && !TREE_PUBLIC (expr)
+	  && DECL_RTL_SET_P (expr)
+	  && MEM_P (DECL_RTL (expr)))
+	{
+	  /* If this is a var that might not be actually output,
+	     return NULL, otherwise stabs might reference an undefined
+	     symbol.  */
+	  struct varpool_node *node = varpool_get_node (expr);
+	  if (!node || !node->needed)
+	    return NULL;
+	}
       /* FALLTHRU */
 
     case PARM_DECL:
new file mode 100644
index 0000000..3985040
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/debug/pr49032.c
@@ -0,0 +1,11 @@
+/* PR debug/49032 */
+/* { dg-do link } */
+
+static int s = 42;
+
+int
+main ()
+{
+  int *l[18] = { &s, &s, &s, &s, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
+  return 0;
+}
-- 
1.7.0.4