provide default for MASK_RETURN_ADDR

gcc/ChangeLog:

2015-04-21  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* defaults.h (MASK_RETURN_ADDR): New definition.
	* except.c (expand_builtin_extract_return_addr): Remove ifdef
	MASK_RETURN_ADDR.

From-SVN: r222299

gcc/ChangeLog

 2015-04-21  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>
 
+	* defaults.h (MASK_RETURN_ADDR): New definition.
+	* except.c (expand_builtin_extract_return_addr): Remove ifdef
+	MASK_RETURN_ADDR.
+
+2015-04-21  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>
+
 	* defaults.h (RETURN_ADDR_OFFSET): New definition.
 	* except.c (expand_builtin_extract_return_addr): Remove ifdef
 	RETURN_ADDR_OFFSET.

gcc/defaults.h

@@ -388,6 +388,10 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #define RETURN_ADDR_OFFSET 0
 #endif
 
+#ifndef MASK_RETURN_ADDR
+#define MASK_RETURN_ADDR NULL_RTX
+#endif
+
 /* If we have named section and we support weak symbols, then use the
    .jcr section for recording java classes which need to be registered
    at program start-up time.  */

gcc/except.c

@@ -2185,9 +2185,9 @@ expand_builtin_extract_return_addr (tree addr_tree)
     }
 
   /* First mask out any unwanted bits.  */
-#ifdef MASK_RETURN_ADDR
-  expand_and (Pmode, addr, MASK_RETURN_ADDR, addr);
-#endif
+  rtx mask = MASK_RETURN_ADDR;
+  if (mask)
+    expand_and (Pmode, addr, mask, addr);
 
   /* Then adjust to find the real return address.  */
   if (RETURN_ADDR_OFFSET)