always define DYNAMIC_CHAIN_ADDRESS

gcc/ChangeLog:

2015-10-10  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* defaults.h (DYNAMIC_CHAIN_ADDRESS): New default definition.
	* builtins.c (expand_builtin_return_addr): Adjust.

From-SVN: r228687

gcc/ChangeLog

 2015-10-10  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>
 
+	* defaults.h (DYNAMIC_CHAIN_ADDRESS): New default definition.
+	* builtins.c (expand_builtin_return_addr): Adjust.
+
+2015-10-10  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>
+
 	* defaults.h (SETUP_FRAME_ADDRESSES): New default definition.
 	* builtins.c (expand_builtin_return_addr): Adjust.
 	* doc/tm.texi: Likewise.

gcc/builtins.c

@@ -799,9 +799,7 @@ expand_builtin_return_addr (enum built_in_function fndecl_code, int count)
     {
       /* Assume the dynamic chain pointer is in the word that the
 	 frame address points to, unless otherwise specified.  */
-#ifdef DYNAMIC_CHAIN_ADDRESS
       tem = DYNAMIC_CHAIN_ADDRESS (tem);
-#endif
       tem = memory_address (Pmode, tem);
       tem = gen_frame_mem (Pmode, tem);
       tem = copy_to_reg (tem);

gcc/defaults.h

@@ -1285,6 +1285,10 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #define SETUP_FRAME_ADDRESSES() do { } while (0)
 #endif
 
+#ifndef DYNAMIC_CHAIN_ADDRESS
+#define DYNAMIC_CHAIN_ADDRESS(x) (x)
+#endif
+
 #ifdef GCC_INSN_FLAGS_H
 /* Dependent default target macro definitions