extern tree build_real_from_int_cst (tree, const_tree);
extern tree build_complex (tree, tree, tree);
extern tree build_one_cst (tree);
+extern tree build_zero_cst (tree);
extern tree build_string (int, const char *);
extern tree build_tree_list_stat (tree, tree MEM_STAT_DECL);
#define build_tree_list(t,q) build_tree_list_stat(t,q MEM_STAT_INFO)