go-lang.c (go_langhook_init_options_struct): Default to -fkeep-gc-roots-live.

	* go-lang.c (go_langhook_init_options_struct): Default to
	-fkeep-gc-roots-live.

From-SVN: r232890

gcc/go/ChangeLog

+2016-01-27  Ian Lance Taylor  <iant@google.com>
+
+	* go-lang.c (go_langhook_init_options_struct): Default to
+	-fkeep-gc-roots-live.
+
 2016-01-04  Jakub Jelinek  <jakub@redhat.com>
 
 	Update copyright years.

gcc/go/go-lang.c

@@ -150,6 +150,9 @@ go_langhook_init_options_struct (struct gcc_options *opts)
   opts->x_flag_exceptions = 1;
   opts->x_flag_non_call_exceptions = 1;
 
+  /* We need to keep pointers live for the garbage collector.  */
+  opts->x_flag_keep_gc_roots_live = 1;
+
   /* Go programs expect runtime.Callers to work, and that uses
      libbacktrace that uses debug info.  Set the debug info level to 1
      by default.  In post_options we will set the debug type if the