2014-04-07  Richard Henderson  <rth@redhat.com>

	* common/config/aarch64/aarch64-common.c (TARGET_OPTION_INIT_STRUCT):

	Define.

	(aarch64_option_init_struct): New function.

--- gcc/common/config/aarch64/aarch64-common.c

+++ gcc/common/config/aarch64/aarch64-common.c

@@ -39,6 +39,9 @@

 #undef	TARGET_OPTION_OPTIMIZATION_TABLE

 #define TARGET_OPTION_OPTIMIZATION_TABLE aarch_option_optimization_table

+#undef TARGET_OPTION_INIT_STRUCT

+#define TARGET_OPTION_INIT_STRUCT aarch64_option_init_struct

+

 /* Set default optimization options.  */

 static const struct default_options aarch_option_optimization_table[] =

   {

@@ -47,6 +50,16 @@ static const struct default_options aarch_option_optimization_table[] =

     { OPT_LEVELS_NONE, 0, NULL, 0 }

   };

+/* Implement TARGET_OPTION_INIT_STRUCT.  */

+

+static void

+aarch64_option_init_struct (struct gcc_options *opts)

+{

+  /* By default, always emit DWARF-2 unwind info.  This allows debugging

+     without maintaining a stack frame back-chain.  */

+  opts->x_flag_asynchronous_unwind_tables = 1;

+}

+

 /* Implement TARGET_HANDLE_OPTION.

    This function handles the target specific options for CPU/target selection.