+extern bool default_have_conditional_execution (void);
+extern int default_memory_move_cost (enum machine_mode, reg_class_t, bool);
+extern int default_register_move_cost (enum machine_mode, reg_class_t,
+ reg_class_t);
+
+extern bool default_profile_before_prologue (void);
+extern reg_class_t default_preferred_reload_class (rtx, reg_class_t);
+extern reg_class_t default_preferred_output_reload_class (rtx, reg_class_t);
+extern bool default_class_likely_spilled_p (reg_class_t);
+
+extern enum unwind_info_type default_debug_unwind_info (void);
+extern enum unwind_info_type default_except_unwind_info (struct gcc_options *);
+extern enum unwind_info_type dwarf2_except_unwind_info (struct gcc_options *);
+extern enum unwind_info_type sjlj_except_unwind_info (struct gcc_options *);
+
+extern int default_label_align_after_barrier_max_skip (rtx);
+extern int default_loop_align_max_skip (rtx);
+extern int default_label_align_max_skip (rtx);
+extern int default_jump_align_max_skip (rtx);
+extern section * default_function_section(tree decl, enum node_frequency freq,
+ bool startup, bool exit);
+extern enum machine_mode default_get_reg_raw_mode(int);
+
+extern const struct default_options empty_optimization_table[];
+
+extern void *default_get_pch_validity (size_t *);
+extern const char *default_pch_valid_p (const void *, size_t);