From df5deb18f15b3fad7e8cd7e1af71c9c52fb1cd7a Mon Sep 17 00:00:00 2001
From: Jakub Jelinek <jakub@redhat.com>
Date: Tue, 17 Mar 2009 18:53:01 +0100
Subject: [PATCH] re PR debug/39474 (DW_AT_location missing for unused
 variables even at -O0)

	PR debug/39474
	* tree-ssa-live.c (remove_unused_locals): Don't remove local
	unused non-artificial variables when not optimizing.

From-SVN: r144914
---
 gcc/ChangeLog       | 4 ++++
 gcc/tree-ssa-live.c | 6 +++---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index fae65dbabcb..8e5fa32928d 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -3,6 +3,10 @@
 	* dwarf2out.c (dwarf2out_imported_module_or_decl_1): Allow
 	non-NAMESPACE_DECL IMPORTED_DECL_ASSOCIATED_DECL.
 
+	PR debug/39474
+	* tree-ssa-live.c (remove_unused_locals): Don't remove local
+	unused non-artificial variables when not optimizing.
+
 	PR debug/39471
 	* dwarf2out.c (dwarf2out_imported_module_or_decl_1): Emit
 	DW_TAG_imported_module even if decl is IMPORTED_DECL with
diff --git a/gcc/tree-ssa-live.c b/gcc/tree-ssa-live.c
index 28a829caedf..5731964e457 100644
--- a/gcc/tree-ssa-live.c
+++ b/gcc/tree-ssa-live.c
@@ -740,7 +740,8 @@ remove_unused_locals (void)
 
       if (TREE_CODE (var) != FUNCTION_DECL
 	  && (!(ann = var_ann (var))
-	      || !ann->used))
+	      || !ann->used)
+	  && (optimize || DECL_ARTIFICIAL (var)))
 	{
 	  if (is_global_var (var))
 	    {
@@ -781,8 +782,7 @@ remove_unused_locals (void)
 
 	  if (TREE_CODE (var) == VAR_DECL
 	      && is_global_var (var)
-	      && bitmap_bit_p (global_unused_vars, DECL_UID (var))
-	      && (optimize || DECL_ARTIFICIAL (var)))
+	      && bitmap_bit_p (global_unused_vars, DECL_UID (var)))
 	    *cell = TREE_CHAIN (*cell);
 	  else
 	    cell = &TREE_CHAIN (*cell);