make sure hooks are enabled for dce survivors

[r8660]

diff --git a/ir/ir/irgopt.c b/ir/ir/irgopt.c
index 0732e9f..5cca955 100644 (file)
--- a/ir/ir/irgopt.c
+++ b/ir/ir/irgopt.c
@@ -797,6 +797,10 @@ survive_dce_t *new_survive_dce(void)
   res->dead_node_elim_subst.context = res;
   res->dead_node_elim_subst.next    = NULL;
 
+#ifndef FIRM_ENABLE_HOOKS
+  assert(0 && "need hooks enabled");
+#endif
+
   register_hook(hook_dead_node_elim, &res->dead_node_elim);
   register_hook(hook_dead_node_elim_subst, &res->dead_node_elim_subst);
   return res;