extern tree build_function_call_expr (tree, tree);
extern tree fold_build_call_expr (tree, tree, tree, tree);
extern tree fold_builtin_call_array (tree, tree, int, tree *);
extern tree build_function_call_expr (tree, tree);
extern tree fold_build_call_expr (tree, tree, tree, tree);
extern tree fold_builtin_call_array (tree, tree, int, tree *);