How to walk a const_tree?

[Georg-Johann Lay]

When calling walk_tree in a hook that gets a node passed
as const_tree, the const qualifier must be kicked off
somehow in order to get get of build warning.


Currently I have the following hook implementation for
TARGET_ASM_DECLARE_CONSTANT_NAME:

static void
avr_asm_declare_constant_name (FILE *file, const char *name,
                               const_tree expr, HOST_WIDE_INT size)
{
  /* FIXME: Is there a way to get rid of the const without using
     inside knowledge of tree resp. const_tree?  */

  tree node = CONST_CAST (union tree_node*, expr);

  walk_tree_without_duplicates (&node, avr_walk_initializer_r, NULL);

  default_asm_declare_constant_name (file, name, expr, size);
}


Is there a better way without using the insides of a tree?

Thanks