function.c (thread_prologue_and_epilogue_insns): Mark last_bb_active as possibly unused.

2011-10-06  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>

	* function.c (thread_prologue_and_epilogue_insns): Mark
	last_bb_active as possibly unused.  It is unused for targets which
	do neither have "return" nor "simple_return" expanders.

From-SVN: r179601

gcc/ChangeLog

+2011-10-06  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>
+
+	* function.c (thread_prologue_and_epilogue_insns): Mark
+	last_bb_active as possibly unused.  It is unused for targets which
+	do neither have "return" nor "simple_return" expanders.
+
 2011-10-06  Richard Guenther  <rguenther@suse.de>
 
 	* fold-const.c (fold_ternary_loc): Also fold non-constant

gcc/function.c

@@ -5453,7 +5453,7 @@ thread_prologue_and_epilogue_insns (void)
 {
   bool inserted;
   basic_block last_bb;
-  bool last_bb_active;
+  bool last_bb_active ATTRIBUTE_UNUSED;
 #ifdef HAVE_simple_return
   bool unconverted_simple_returns = false;
   basic_block simple_return_block_hot = NULL;