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

@@ -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

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);