always define EH_RETURN_HANDLER_RTX

gcc/ChangeLog:

2015-11-14  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* defaults.h (EH_RETURN_HANDLER_RTX): New default definition.
	* df-scan.c (df_get_exit_block_use_set): Adjust.
	* except.c (expand_eh_return): Likewise.

From-SVN: r230392

gcc/ChangeLog

 2015-11-14  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>
 
+	* defaults.h (EH_RETURN_HANDLER_RTX): New default definition.
+	* df-scan.c (df_get_exit_block_use_set): Adjust.
+	* except.c (expand_eh_return): Likewise.
+
+2015-11-14  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>
+
 	* config/i386/i386.h (TARGET_PECOFF): Remove define.
 	* defaults.h (TARGET_PECOFF): New default definition.
 	* varasm.c (handle_vtv_comdat_section): Adjust.

gcc/defaults.h

@@ -1305,6 +1305,10 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #define TARGET_PECOFF 0
 #endif
 
+#ifndef EH_RETURN_HANDLER_RTX
+#define EH_RETURN_HANDLER_RTX NULL
+#endif
+
 #ifdef GCC_INSN_FLAGS_H
 /* Dependent default target macro definitions
 

gcc/df-scan.c

@@ -3714,7 +3714,6 @@ df_get_exit_block_use_set (bitmap exit_block_uses)
     }
 #endif
 
-#ifdef EH_RETURN_HANDLER_RTX
   if ((!targetm.have_epilogue () || ! epilogue_completed)
       && crtl->calls_eh_return)
     {
@@ -3722,7 +3721,6 @@ df_get_exit_block_use_set (bitmap exit_block_uses)
       if (tmp && REG_P (tmp))
 	df_mark_reg (tmp, exit_block_uses);
     }
-#endif
 
   /* Mark function return value.  */
   diddle_return_value (df_mark_reg, (void*) exit_block_uses);

gcc/except.c

@@ -2255,11 +2255,10 @@ expand_eh_return (void)
     emit_insn (targetm.gen_eh_return (crtl->eh.ehr_handler));
   else
     {
-#ifdef EH_RETURN_HANDLER_RTX
-      emit_move_insn (EH_RETURN_HANDLER_RTX, crtl->eh.ehr_handler);
-#else
-      error ("__builtin_eh_return not supported on this target");
-#endif
+      if (rtx handler = EH_RETURN_HANDLER_RTX)
+	emit_move_insn (handler, crtl->eh.ehr_handler);
+      else
+	error ("__builtin_eh_return not supported on this target");
     }
 
   emit_label (around_label);