-void hook_void_tree_int PARAMS ((tree, int));
-void hook_void_void PARAMS ((void));
-void hook_void_FILEptr_constcharptr PARAMS ((FILE *, const char *));
-void hook_void_tree PARAMS ((tree));
-void hook_void_tree_treeptr PARAMS ((tree, tree *));
+extern bool hook_bool_void_false (void);
+extern bool hook_bool_void_true (void);
+extern bool hook_bool_bool_false (bool);
+extern bool hook_bool_mode_false (enum machine_mode);
+extern bool hook_bool_mode_rtx_false (enum machine_mode, rtx);
+extern bool hook_bool_mode_rtx_true (enum machine_mode, rtx);
+extern bool hook_bool_tree_false (tree);
+extern bool hook_bool_tree_true (tree);
+extern bool hook_bool_tree_hwi_hwi_tree_false (tree, HOST_WIDE_INT, HOST_WIDE_INT,
+ tree);
+extern bool hook_bool_tree_hwi_hwi_tree_true (tree, HOST_WIDE_INT, HOST_WIDE_INT,
+ tree);
+extern bool hook_bool_rtx_false (rtx);
+extern bool hook_bool_uintp_uintp_false (unsigned int *, unsigned int *);
+extern bool hook_bool_rtx_int_int_intp_false (rtx, int, int, int *);
+extern bool hook_bool_constcharptr_size_t_false (const char *, size_t);
+extern bool hook_bool_size_t_constcharptr_int_true (size_t, const char *, int);
+extern bool hook_bool_tree_tree_false (tree, tree);
+extern bool hook_bool_tree_bool_false (tree, bool);