Constify add_com

This changes add_com to take a cmd_const_cfunc_ftype, and then fixes
up all the command implementations.

In most cases this is trivial.

In a couple of places I had to again introduce a temporary non-const
overload.  These overloads will be removed when add_info is
constified.

gdb/ChangeLog
2017-11-07  Tom Tromey  <tom@tromey.com>

	* solib.h (no_shared_libraries): Constify.
	* frame.h (return_command): Constify.
	* cli/cli-cmds.h (quit_command): Constify.
	* top.h (quit_command, execute_command): Constify.
	* target.h (flash_erase_command): Constify.
	* inferior.h (set_inferior_args, attach_command): Constify.
	* tracepoint.h (start_tracing, stop_tracing): Constify.
	* breakpoint.h (break_command, tbreak_command)
	(hbreak_command_wrapper, thbreak_command_wrapper)
	(rbreak_command_wrapper, watch_command_wrapper)
	(awatch_command_wrapper, rwatch_command_wrapper)
	(get_tracepoint_by_number): Constify.
	* symtab.c (info_variables_command, rbreak_command)
	(symtab_symbol_info): Constify.
	(info_variables_command): Add non-const overload.
	* top.c (dont_repeat_command): Constify.
	* breakpoint.c (ignore_command, commands_command)
	(condition_command, tbreak_command, hbreak_command)
	(thbreak_command, clear_command, break_command)
	(info_breakpoints_command, watch_command, rwatch_command)
	(awatch_command, trace_command, ftrace_command, strace_command)
	(trace_pass_command, break_range_command, dprintf_command)
	(agent_printf_command, get_tracepoint_by_number)
	(watch_maybe_just_location, trace_pass_command): Constify.
	(info_breakpoints_command): Add non-const overload.
	* tracefile.c (tsave_command): Constify.
	* infcmd.c (attach_command, disconnect_command, signal_command)
	(queue_signal_command, stepi_command, nexti_command)
	(finish_command, next_command, step_command, until_command)
	(advance_command, jump_command, continue_command, run_command)
	(start_command, starti_command, interrupt_command)
	(run_command_1, set_inferior_args, step_1): Constify.
	* inferior.c (add_inferior_command, remove_inferior_command)
	(clone_inferior_command): Constify.
	* linux-fork.c (checkpoint_command, restart_command): Constify.
	* windows-nat.c (signal_event_command): Constify.
	* guile/guile.c (guile_repl_command, guile_command): Constify.
	* printcmd.c (x_command, display_command, printf_command)
	(output_command, set_command, call_command, print_command)
	(eval_command): Constify.
	(non_const_set_command): Remove.
	(_initialize_printcmd): Update.
	* source.c (forward_search_command, reverse_search_command):
	Constify.
	* jit.c (jit_reader_load_command, jit_reader_unload_command):
	Constify.
	* infrun.c (handle_command): Constify.
	* memattr.c (mem_command): Constify.
	* stack.c (return_command, up_command, up_silently_command)
	(down_command, down_silently_command, frame_command)
	(backtrace_command, func_command, backtrace_command_1): Constify.
	(backtrace_command): Add non-const overload.
	* remote-sim.c (simulator_command): Constify.
	* exec.c (set_section_command): Constify.
	* tracepoint.c (tdump_command, trace_variable_command)
	(tstatus_command, tstop_command, tstart_command)
	(end_actions_pseudocommand, while_stepping_pseudocommand)
	(collect_pseudocommand, teval_pseudocommand, actions_command)
	(start_tracing, stop_tracing): Constify.
	* value.c (init_if_undefined_command): Constify.
	* tui/tui-stack.c (tui_update_command): Constify.
	* tui/tui-win.c (tui_refresh_all_command)
	(tui_set_tab_width_command, tui_set_win_height_command)
	(tui_set_focus_command, tui_scroll_forward_command)
	(tui_scroll_backward_command, tui_scroll_left_command)
	(tui_scroll_right_command, parse_scrolling_args, tui_set_focus)
	(tui_set_win_height): Constify.
	* tui/tui-layout.c (tui_layout_command): Constify.
	* procfs.c (proc_trace_syscalls, proc_trace_sysentry_cmd)
	(proc_trace_sysexit_cmd, proc_untrace_sysentry_cmd)
	(proc_untrace_sysexit_cmd): Constify.
	* remote.c (threadlist_test_cmd, threadinfo_test_cmd)
	(threadset_test_cmd, threadlist_update_test_cmd)
	(threadalive_test): Constify.
	* objc-lang.c (print_object_command): Constify.
	* command.h (add_com): Constify.
	* cli/cli-dump.c (restore_command): Constify.
	* cli/cli-cmds.c (pwd_command, echo_command, quit_command)
	(help_command, complete_command, shell_command, edit_command)
	(list_command, disassemble_command, make_command)
	(apropos_command, alias_command): Constify.
	* cli/cli-script.c (document_command, define_command)
	(while_command, if_command, validate_comname): Constify.
	* cli/cli-decode.c (struct cmd_list_element): Change type of
	"fun".
	* target.c (do_monitor_command, flash_erase_command): Constify.
	* regcache.c (reg_flush_command): Constify.
	* reverse.c (reverse_step, reverse_next, reverse_stepi)
	(reverse_nexti, reverse_continue, reverse_finish)
	(save_bookmark_command, goto_bookmark_command)
	(exec_reverse_once): Constify.
	* python/python.c (python_interactive_command, python_command):
	Constify.
	* typeprint.c (ptype_command, whatis_command, whatis_exp):
	Constify.
	* solib.c (sharedlibrary_command, no_shared_libraries): Constify.
	* gcore.c (gcore_command): Constify.

46 files changed, 355 insertions, 318 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 740d75f..25ece7f 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,105 @@
 2017-11-07  Tom Tromey  <tom@tromey.com>
 
+	* solib.h (no_shared_libraries): Constify.
+	* frame.h (return_command): Constify.
+	* cli/cli-cmds.h (quit_command): Constify.
+	* top.h (quit_command, execute_command): Constify.
+	* target.h (flash_erase_command): Constify.
+	* inferior.h (set_inferior_args, attach_command): Constify.
+	* tracepoint.h (start_tracing, stop_tracing): Constify.
+	* breakpoint.h (break_command, tbreak_command)
+	(hbreak_command_wrapper, thbreak_command_wrapper)
+	(rbreak_command_wrapper, watch_command_wrapper)
+	(awatch_command_wrapper, rwatch_command_wrapper)
+	(get_tracepoint_by_number): Constify.
+	* symtab.c (info_variables_command, rbreak_command)
+	(symtab_symbol_info): Constify.
+	(info_variables_command): Add non-const overload.
+	* top.c (dont_repeat_command): Constify.
+	* breakpoint.c (ignore_command, commands_command)
+	(condition_command, tbreak_command, hbreak_command)
+	(thbreak_command, clear_command, break_command)
+	(info_breakpoints_command, watch_command, rwatch_command)
+	(awatch_command, trace_command, ftrace_command, strace_command)
+	(trace_pass_command, break_range_command, dprintf_command)
+	(agent_printf_command, get_tracepoint_by_number)
+	(watch_maybe_just_location, trace_pass_command): Constify.
+	(info_breakpoints_command): Add non-const overload.
+	* tracefile.c (tsave_command): Constify.
+	* infcmd.c (attach_command, disconnect_command, signal_command)
+	(queue_signal_command, stepi_command, nexti_command)
+	(finish_command, next_command, step_command, until_command)
+	(advance_command, jump_command, continue_command, run_command)
+	(start_command, starti_command, interrupt_command)
+	(run_command_1, set_inferior_args, step_1): Constify.
+	* inferior.c (add_inferior_command, remove_inferior_command)
+	(clone_inferior_command): Constify.
+	* linux-fork.c (checkpoint_command, restart_command): Constify.
+	* windows-nat.c (signal_event_command): Constify.
+	* guile/guile.c (guile_repl_command, guile_command): Constify.
+	* printcmd.c (x_command, display_command, printf_command)
+	(output_command, set_command, call_command, print_command)
+	(eval_command): Constify.
+	(non_const_set_command): Remove.
+	(_initialize_printcmd): Update.
+	* source.c (forward_search_command, reverse_search_command):
+	Constify.
+	* jit.c (jit_reader_load_command, jit_reader_unload_command):
+	Constify.
+	* infrun.c (handle_command): Constify.
+	* memattr.c (mem_command): Constify.
+	* stack.c (return_command, up_command, up_silently_command)
+	(down_command, down_silently_command, frame_command)
+	(backtrace_command, func_command, backtrace_command_1): Constify.
+	(backtrace_command): Add non-const overload.
+	* remote-sim.c (simulator_command): Constify.
+	* exec.c (set_section_command): Constify.
+	* tracepoint.c (tdump_command, trace_variable_command)
+	(tstatus_command, tstop_command, tstart_command)
+	(end_actions_pseudocommand, while_stepping_pseudocommand)
+	(collect_pseudocommand, teval_pseudocommand, actions_command)
+	(start_tracing, stop_tracing): Constify.
+	* value.c (init_if_undefined_command): Constify.
+	* tui/tui-stack.c (tui_update_command): Constify.
+	* tui/tui-win.c (tui_refresh_all_command)
+	(tui_set_tab_width_command, tui_set_win_height_command)
+	(tui_set_focus_command, tui_scroll_forward_command)
+	(tui_scroll_backward_command, tui_scroll_left_command)
+	(tui_scroll_right_command, parse_scrolling_args, tui_set_focus)
+	(tui_set_win_height): Constify.
+	* tui/tui-layout.c (tui_layout_command): Constify.
+	* procfs.c (proc_trace_syscalls, proc_trace_sysentry_cmd)
+	(proc_trace_sysexit_cmd, proc_untrace_sysentry_cmd)
+	(proc_untrace_sysexit_cmd): Constify.
+	* remote.c (threadlist_test_cmd, threadinfo_test_cmd)
+	(threadset_test_cmd, threadlist_update_test_cmd)
+	(threadalive_test): Constify.
+	* objc-lang.c (print_object_command): Constify.
+	* command.h (add_com): Constify.
+	* cli/cli-dump.c (restore_command): Constify.
+	* cli/cli-cmds.c (pwd_command, echo_command, quit_command)
+	(help_command, complete_command, shell_command, edit_command)
+	(list_command, disassemble_command, make_command)
+	(apropos_command, alias_command): Constify.
+	* cli/cli-script.c (document_command, define_command)
+	(while_command, if_command, validate_comname): Constify.
+	* cli/cli-decode.c (struct cmd_list_element): Change type of
+	"fun".
+	* target.c (do_monitor_command, flash_erase_command): Constify.
+	* regcache.c (reg_flush_command): Constify.
+	* reverse.c (reverse_step, reverse_next, reverse_stepi)
+	(reverse_nexti, reverse_continue, reverse_finish)
+	(save_bookmark_command, goto_bookmark_command)
+	(exec_reverse_once): Constify.
+	* python/python.c (python_interactive_command, python_command):
+	Constify.
+	* typeprint.c (ptype_command, whatis_command, whatis_exp):
+	Constify.
+	* solib.c (sharedlibrary_command, no_shared_libraries): Constify.
+	* gcore.c (gcore_command): Constify.
+
+2017-11-07  Tom Tromey  <tom@tromey.com>
+
 	* printcmd.c (x_command): Call set_repeat_arguments.
 	* cli/cli-cmds.c (list_command): Call set_repeat_arguments.
 	* top.c (repeat_arguments): New global.
diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c
index 97f704a..4272378 100644
--- a/gdb/breakpoint.c
+++ b/gdb/breakpoint.c
@@ -96,8 +96,6 @@ enum exception_event_kind
 static void map_breakpoint_numbers (const char *,
 				    gdb::function_view<void (breakpoint *)>);
 
-static void ignore_command (char *, int);
-
 static void breakpoint_re_set_default (struct breakpoint *);
 
 static void
@@ -119,8 +117,6 @@ static std::vector<symtab_and_line> decode_location_default
   (struct breakpoint *b, const struct event_location *location,
    struct program_space *search_pspace);
 
-static void clear_command (char *, int);
-
 static int can_use_hardware_watchpoint (struct value *);
 
 static void mention (struct breakpoint *);
@@ -165,14 +161,8 @@ static int breakpoint_location_address_range_overlap (struct bp_location *,
 						      const address_space *,
 						      CORE_ADDR, int);
 
-static void info_breakpoints_command (char *, int);
-
 static void info_watchpoints_command (char *, int);
 
-static void commands_command (char *, int);
-
-static void condition_command (char *, int);
-
 static int remove_breakpoint (struct bp_location *);
 static int remove_breakpoint_1 (struct bp_location *, enum remove_bp_reason);
 
@@ -186,10 +176,6 @@ static int hw_watchpoint_used_count_others (struct breakpoint *except,
 					    enum bptype type,
 					    int *other_type_used);
 
-static void hbreak_command (char *, int);
-
-static void thbreak_command (char *, int);
-
 static void enable_breakpoint_disp (struct breakpoint *, enum bpdisp,
 				    int count);
 
@@ -248,7 +234,7 @@ static void enable_trace_command (char *, int);
 
 static void disable_trace_command (char *, int);
 
-static void trace_pass_command (char *, int);
+static void trace_pass_command (const char *, int);
 
 static void set_tracepoint_count (int num);
 
@@ -980,10 +966,10 @@ condition_completer (struct cmd_list_element *cmd,
 /* condition N EXP -- set break condition of breakpoint N to EXP.  */
 
 static void
-condition_command (char *arg, int from_tty)
+condition_command (const char *arg, int from_tty)
 {
   struct breakpoint *b;
-  char *p;
+  const char *p;
   int bnum;
 
   if (arg == 0)
@@ -1301,7 +1287,7 @@ commands_command_1 (const char *arg, int from_tty,
 }
 
 static void
-commands_command (char *arg, int from_tty)
+commands_command (const char *arg, int from_tty)
 {
   commands_command_1 (arg, from_tty, NULL);
 }
@@ -6712,13 +6698,21 @@ default_collect_info (void)
 }
   
 static void
-info_breakpoints_command (char *args, int from_tty)
+info_breakpoints_command (const char *args, int from_tty)
 {
   breakpoint_1 (args, 0, NULL);
 
   default_collect_info ();
 }
 
+/* Temporary non-const overload.  */
+
+static void
+info_breakpoints_command (char *args, int from_tty)
+{
+  info_breakpoints_command ((const char *) args, from_tty);
+}
+
 static void
 info_watchpoints_command (char *args, int from_tty)
 {
@@ -9632,25 +9626,25 @@ resolve_sal_pc (struct symtab_and_line *sal)
 }
 
 void
-break_command (char *arg, int from_tty)
+break_command (const char *arg, int from_tty)
 {
   break_command_1 (arg, 0, from_tty);
 }
 
 void
-tbreak_command (char *arg, int from_tty)
+tbreak_command (const char *arg, int from_tty)
 {
   break_command_1 (arg, BP_TEMPFLAG, from_tty);
 }
 
 static void
-hbreak_command (char *arg, int from_tty)
+hbreak_command (const char *arg, int from_tty)
 {
   break_command_1 (arg, BP_HARDWAREFLAG, from_tty);
 }
 
 static void
-thbreak_command (char *arg, int from_tty)
+thbreak_command (const char *arg, int from_tty)
 {
   break_command_1 (arg, (BP_TEMPFLAG | BP_HARDWAREFLAG), from_tty);
 }
@@ -9734,9 +9728,8 @@ stopat_command (const char *arg, int from_tty)
    line.  */
 
 static void
-dprintf_command (char *arg_in, int from_tty)
+dprintf_command (const char *arg, int from_tty)
 {
-  const char *arg = arg_in;
   event_location_up location = string_to_event_location (&arg, current_language);
 
   /* If non-NULL, ARG should have been advanced past the location;
@@ -9766,7 +9759,7 @@ dprintf_command (char *arg_in, int from_tty)
 }
 
 static void
-agent_printf_command (char *arg, int from_tty)
+agent_printf_command (const char *arg, int from_tty)
 {
   error (_("May only run agent-printf on the target"));
 }
@@ -9950,9 +9943,8 @@ find_breakpoint_range_end (struct symtab_and_line sal)
 /* Implement the "break-range" CLI command.  */
 
 static void
-break_range_command (char *arg_in, int from_tty)
+break_range_command (const char *arg, int from_tty)
 {
-  const char *arg = arg_in;
   const char *arg_start;
   struct linespec_result canonical_start, canonical_end;
   int bp_count, can_use_bp, length;
@@ -11056,7 +11048,7 @@ watch_command_wrapper (const char *arg, int from_tty, int internal)
    calls watch_command_1.  */
 
 static void
-watch_maybe_just_location (char *arg, int accessflag, int from_tty)
+watch_maybe_just_location (const char *arg, int accessflag, int from_tty)
 {
   int just_location = 0;
 
@@ -11072,7 +11064,7 @@ watch_maybe_just_location (char *arg, int accessflag, int from_tty)
 }
 
 static void
-watch_command (char *arg, int from_tty)
+watch_command (const char *arg, int from_tty)
 {
   watch_maybe_just_location (arg, hw_write, from_tty);
 }
@@ -11084,7 +11076,7 @@ rwatch_command_wrapper (const char *arg, int from_tty, int internal)
 }
 
 static void
-rwatch_command (char *arg, int from_tty)
+rwatch_command (const char *arg, int from_tty)
 {
   watch_maybe_just_location (arg, hw_read, from_tty);
 }
@@ -11096,7 +11088,7 @@ awatch_command_wrapper (const char *arg, int from_tty, int internal)
 }
 
 static void
-awatch_command (char *arg, int from_tty)
+awatch_command (const char *arg, int from_tty)
 {
   watch_maybe_just_location (arg, hw_access, from_tty);
 }
@@ -11503,7 +11495,7 @@ compare_breakpoints (const breakpoint *a, const breakpoint *b)
 /* Delete breakpoints by address or line.  */
 
 static void
-clear_command (char *arg, int from_tty)
+clear_command (const char *arg, int from_tty)
 {
   struct breakpoint *b;
   int default_match;
@@ -14108,9 +14100,9 @@ set_ignore_count (int bptnum, int count, int from_tty)
 /* Command to set ignore-count of breakpoint N to COUNT.  */
 
 static void
-ignore_command (char *args, int from_tty)
+ignore_command (const char *args, int from_tty)
 {
-  char *p = args;
+  const char *p = args;
   int num;
 
   if (p == 0)
@@ -14737,9 +14729,8 @@ set_tracepoint_count (int num)
 }
 
 static void
-trace_command (char *arg_in, int from_tty)
+trace_command (const char *arg, int from_tty)
 {
-  const char *arg = arg_in;
   struct breakpoint_ops *ops;
 
   event_location_up location = string_to_event_location (&arg,
@@ -14764,9 +14755,8 @@ trace_command (char *arg_in, int from_tty)
 }
 
 static void
-ftrace_command (char *arg_in, int from_tty)
+ftrace_command (const char *arg, int from_tty)
 {
-  const char *arg = arg_in;
   event_location_up location = string_to_event_location (&arg,
 							 current_language);
   create_breakpoint (get_current_arch (),
@@ -14785,9 +14775,8 @@ ftrace_command (char *arg_in, int from_tty)
 /* strace command implementation.  Creates a static tracepoint.  */
 
 static void
-strace_command (char *arg_in, int from_tty)
+strace_command (const char *arg, int from_tty)
 {
-  const char *arg = arg_in;
   struct breakpoint_ops *ops;
   event_location_up location;
 
@@ -15023,16 +15012,16 @@ trace_pass_set_count (struct tracepoint *tp, int count, int from_tty)
    Also accepts special argument "all".  */
 
 static void
-trace_pass_command (char *args, int from_tty)
+trace_pass_command (const char *args, int from_tty)
 {
   struct tracepoint *t1;
-  unsigned int count;
+  ULONGEST count;
 
   if (args == 0 || *args == 0)
     error (_("passcount command requires an "
 	     "argument (count + optional TP num)"));
 
-  count = strtoul (args, &args, 10);	/* Count comes first, then TP num.  */
+  count = strtoulst (args, &args, 10);	/* Count comes first, then TP num.  */
 
   args = skip_spaces (args);
   if (*args && strncasecmp (args, "all", 3) == 0)
@@ -15105,12 +15094,12 @@ get_tracepoint_by_number_on_target (int num)
    (tracepoint_count) is returned.  */
 
 struct tracepoint *
-get_tracepoint_by_number (char **arg,
+get_tracepoint_by_number (const char **arg,
 			  number_or_range_parser *parser)
 {
   struct breakpoint *t;
   int tpnum;
-  char *instring = arg == NULL ? NULL : *arg;
+  const char *instring = arg == NULL ? NULL : *arg;
 
   if (parser != NULL)
     {
diff --git a/gdb/breakpoint.h b/gdb/breakpoint.h
index aa06d11..cf8f3f6 100644
--- a/gdb/breakpoint.h
+++ b/gdb/breakpoint.h
@@ -1261,15 +1261,15 @@ extern struct command_line *breakpoint_commands (struct breakpoint *b);
    NOT be deallocated after use.  */
 const char *bpdisp_text (enum bpdisp disp);
 
-extern void break_command (char *, int);
+extern void break_command (const char *, int);
 
-extern void hbreak_command_wrapper (char *, int);
-extern void thbreak_command_wrapper (char *, int);
-extern void rbreak_command_wrapper (char *, int);
+extern void hbreak_command_wrapper (const char *, int);
+extern void thbreak_command_wrapper (const char *, int);
+extern void rbreak_command_wrapper (const char *, int);
 extern void watch_command_wrapper (const char *, int, int);
 extern void awatch_command_wrapper (const char *, int, int);
 extern void rwatch_command_wrapper (const char *, int, int);
-extern void tbreak_command (char *, int);
+extern void tbreak_command (const char *, int);
 
 extern struct breakpoint_ops base_breakpoint_ops;
 extern struct breakpoint_ops bkpt_breakpoint_ops;
@@ -1591,7 +1591,7 @@ extern struct tracepoint *get_tracepoint_by_number_on_target (int num);
 
 /* Find a tracepoint by parsing a number in the supplied string.  */
 extern struct tracepoint *
-  get_tracepoint_by_number (char **arg,
+  get_tracepoint_by_number (const char **arg,
 			    number_or_range_parser *parser);
 
 /* Return a vector of all tracepoints currently defined.  The vector
diff --git a/gdb/cli/cli-cmds.c b/gdb/cli/cli-cmds.c
index a8edb13..be022d3 100644
--- a/gdb/cli/cli-cmds.c
+++ b/gdb/cli/cli-cmds.c
@@ -58,24 +58,6 @@
 #include <algorithm>
 #include <string>
 
-/* Prototypes for local command functions */
-
-static void complete_command (char *, int);
-
-static void echo_command (char *, int);
-
-static void pwd_command (char *, int);
-
-static void help_command (char *, int);
-
-static void make_command (char *, int);
-
-static void shell_escape (const char *, int);
-
-static void edit_command (char *, int);
-
-static void list_command (char *, int);
-
 /* Prototypes for local utility functions */
 
 static void print_sal_location (const symtab_and_line &sal);
@@ -238,7 +220,7 @@ show_command (char *arg, int from_tty)
    is ignored.  */
 
 static void
-help_command (char *command, int from_tty)
+help_command (const char *command, int from_tty)
 {
   help_cmd (command, gdb_stdout);
 }
@@ -248,10 +230,8 @@ help_command (char *command, int from_tty)
    [Is that why this function writes output with *_unfiltered?]  */
 
 static void
-complete_command (char *arg_entry, int from_tty)
+complete_command (const char *arg, int from_tty)
 {
-  const char *arg = arg_entry;
-
   dont_repeat ();
 
   if (max_completions == 0)
@@ -356,7 +336,7 @@ show_configuration (const char *args, int from_tty)
 /* Handle the quit command.  */
 
 void
-quit_command (char *args, int from_tty)
+quit_command (const char *args, int from_tty)
 {
   int exit_code = 0;
 
@@ -378,7 +358,7 @@ quit_command (char *args, int from_tty)
 }
 
 static void
-pwd_command (char *args, int from_tty)
+pwd_command (const char *args, int from_tty)
 {
   if (args)
     error (_("The \"pwd\" command does not take an argument: %s"), args);
@@ -693,7 +673,7 @@ source_command (const char *args, int from_tty)
 
 
 static void
-echo_command (char *text, int from_tty)
+echo_command (const char *text, int from_tty)
 {
   const char *p = text;
   int c;
@@ -785,13 +765,13 @@ shell_escape (const char *arg, int from_tty)
 /* Implementation of the "shell" command.  */
 
 static void
-shell_command (char *arg, int from_tty)
+shell_command (const char *arg, int from_tty)
 {
   shell_escape (arg, from_tty);
 }
 
 static void
-edit_command (char *arg, int from_tty)
+edit_command (const char *arg, int from_tty)
 {
   struct symtab_and_line sal;
   struct symbol *sym;
@@ -891,7 +871,7 @@ edit_command (char *arg, int from_tty)
 }
 
 static void
-list_command (char *arg, int from_tty)
+list_command (const char *arg, int from_tty)
 {
   struct symbol *sym;
   const char *arg1;
@@ -899,7 +879,7 @@ list_command (char *arg, int from_tty)
   int dummy_end = 0;
   int dummy_beg = 0;
   int linenum_beg = 0;
-  char *p;
+  const char *p;
 
   /* Pull in the current default source line if necessary.  */
   if (arg == NULL || ((arg[0] == '+' || arg[0] == '-') && arg[1] == '\0'))
@@ -1205,7 +1185,7 @@ disassemble_current_function (gdb_disassembly_flags flags)
    2) File names and contents for all relevant source files are displayed.  */
 
 static void
-disassemble_command (char *arg, int from_tty)
+disassemble_command (const char *arg, int from_tty)
 {
   struct gdbarch *gdbarch = get_current_arch ();
   CORE_ADDR low, high;
@@ -1295,7 +1275,7 @@ disassemble_command (char *arg, int from_tty)
 }
 
 static void
-make_command (char *arg, int from_tty)
+make_command (const char *arg, int from_tty)
 {
   if (arg == 0)
     shell_escape ("make", from_tty);
@@ -1336,7 +1316,7 @@ show_user (const char *args, int from_tty)
    regular expression.  */
 
 static void 
-apropos_command (char *searchstr, int from_tty)
+apropos_command (const char *searchstr, int from_tty)
 {
   if (searchstr == NULL)
     error (_("REGEXP string is empty"));
@@ -1405,11 +1385,11 @@ alias_usage_error (void)
 /* Make an alias of an existing command.  */
 
 static void
-alias_command (char *args, int from_tty)
+alias_command (const char *args, int from_tty)
 {
   int i, alias_argc, command_argc;
   int abbrev_flag = 0;
-  char *equals;
+  const char *equals;
   const char *alias, *command;
 
   if (args == NULL || strchr (args, '=') == NULL)
diff --git a/gdb/cli/cli-cmds.h b/gdb/cli/cli-cmds.h
index 34d19f5..14fc931 100644
--- a/gdb/cli/cli-cmds.h
+++ b/gdb/cli/cli-cmds.h
@@ -114,7 +114,7 @@ extern void cd_command (const char *, int);
 
 /* Exported to gdb/top.c and gdb/main.c */
 
-extern void quit_command (char *, int);
+extern void quit_command (const char *, int);
 
 extern void source_script (const char *, int);
 
diff --git a/gdb/cli/cli-decode.c b/gdb/cli/cli-decode.c
index 76be7d3..e9baf38 100644
--- a/gdb/cli/cli-decode.c
+++ b/gdb/cli/cli-decode.c
@@ -931,7 +931,8 @@ add_info_alias (const char *name, const char *oldname, int abbrev_flag)
 /* Add an element to the list of commands.  */
 
 struct cmd_list_element *
-add_com (const char *name, enum command_class theclass, cmd_cfunc_ftype *fun,
+add_com (const char *name, enum command_class theclass,
+	 cmd_const_cfunc_ftype *fun,
 	 const char *doc)
 {
   return add_cmd (name, theclass, fun, doc, &cmdlist);
diff --git a/gdb/cli/cli-dump.c b/gdb/cli/cli-dump.c
index 4eafffa..3443299 100644
--- a/gdb/cli/cli-dump.c
+++ b/gdb/cli/cli-dump.c
@@ -513,12 +513,11 @@ restore_binary_file (const char *filename, struct callback_data *data)
 }
 
 static void
-restore_command (char *args_in, int from_tty)
+restore_command (const char *args, int from_tty)
 {
   struct callback_data data;
   bfd *ibfd;
   int binary_flag = 0;
-  const char *args = args_in;
 
   if (!target_has_execution)
     noprocess ();
diff --git a/gdb/cli/cli-script.c b/gdb/cli/cli-script.c
index bbdfa40..b06dbc2 100644
--- a/gdb/cli/cli-script.c
+++ b/gdb/cli/cli-script.c
@@ -673,7 +673,7 @@ execute_control_command_untraced (struct command_line *cmd)
    loop condition is nonzero.  */
 
 static void
-while_command (char *arg, int from_tty)
+while_command (const char *arg, int from_tty)
 {
   control_level = 1;
   command_line_up command = get_command_line (while_control, arg);
@@ -690,7 +690,7 @@ while_command (char *arg, int from_tty)
    on the value of the if conditional.  */
 
 static void
-if_command (char *arg, int from_tty)
+if_command (const char *arg, int from_tty)
 {
   control_level = 1;
   command_line_up command = get_command_line (if_control, arg);
@@ -1366,10 +1366,10 @@ copy_command_lines (struct command_line *cmds)
    prefix.  */
 
 static struct cmd_list_element **
-validate_comname (char **comname)
+validate_comname (const char **comname)
 {
   struct cmd_list_element **list = &cmdlist;
-  char *p, *last_word;
+  const char *p, *last_word;
 
   if (*comname == 0)
     error_no_arg (_("name of command to define"));
@@ -1386,19 +1386,16 @@ validate_comname (char **comname)
   if (last_word != *comname)
     {
       struct cmd_list_element *c;
-      char saved_char;
-      const char *tem = *comname;
 
       /* Separate the prefix and the command.  */
-      saved_char = last_word[-1];
-      last_word[-1] = '\0';
+      std::string prefix (*comname, last_word - 1);
+      const char *tem = prefix.c_str ();
 
       c = lookup_cmd (&tem, cmdlist, "", 0, 1);
       if (c->prefixlist == NULL)
-	error (_("\"%s\" is not a prefix command."), *comname);
+	error (_("\"%s\" is not a prefix command."), prefix.c_str ());
 
       list = c->prefixlist;
-      last_word[-1] = saved_char;
       *comname = last_word;
     }
 
@@ -1420,7 +1417,7 @@ user_defined_command (const char *ignore, int from_tty)
 }
 
 static void
-define_command (char *comname, int from_tty)
+define_command (const char *comname, int from_tty)
 {
 #define MAX_TMPBUF 128   
   enum cmd_hook_type
@@ -1430,8 +1427,7 @@ define_command (char *comname, int from_tty)
       CMD_POST_HOOK
     };
   struct cmd_list_element *c, *newc, *hookc = 0, **list;
-  char *tem, *comfull;
-  const char *tem_c;
+  const char *tem, *comfull;
   char tmpbuf[MAX_TMPBUF];
   int  hook_type      = CMD_NO_HOOK;
   int  hook_name_size = 0;
@@ -1445,8 +1441,8 @@ define_command (char *comname, int from_tty)
   list = validate_comname (&comname);
 
   /* Look it up, and verify that we got an exact match.  */
-  tem_c = comname;
-  c = lookup_cmd (&tem_c, *list, "", -1, 1);
+  tem = comname;
+  c = lookup_cmd (&tem, *list, "", -1, 1);
   if (c && strcmp (comname, c->name) != 0)
     c = 0;
 
@@ -1480,8 +1476,8 @@ define_command (char *comname, int from_tty)
   if (hook_type != CMD_NO_HOOK)
     {
       /* Look up cmd it hooks, and verify that we got an exact match.  */
-      tem_c = comname + hook_name_size;
-      hookc = lookup_cmd (&tem_c, *list, "", -1, 0);
+      tem = comname + hook_name_size;
+      hookc = lookup_cmd (&tem, *list, "", -1, 0);
       if (hookc && strcmp (comname + hook_name_size, hookc->name) != 0)
 	hookc = 0;
       if (!hookc)
@@ -1531,11 +1527,11 @@ define_command (char *comname, int from_tty)
 }
 
 static void
-document_command (char *comname, int from_tty)
+document_command (const char *comname, int from_tty)
 {
   struct cmd_list_element *c, **list;
   const char *tem;
-  char *comfull;
+  const char *comfull;
   char tmpbuf[128];
 
   comfull = comname;
diff --git a/gdb/command.h b/gdb/command.h
index 63c7658..c3348bc 100644
--- a/gdb/command.h
+++ b/gdb/command.h
@@ -256,7 +256,7 @@ extern int lookup_cmd_composition (const char *text,
 				   struct cmd_list_element **cmd);
 
 extern struct cmd_list_element *add_com (const char *, enum command_class,
-					 cmd_cfunc_ftype *fun,
+					 cmd_const_cfunc_ftype *fun,
 					 const char *);
 
 extern struct cmd_list_element *add_com_alias (const char *, const char *,
diff --git a/gdb/exec.c b/gdb/exec.c
index 326cfff..4fbe9dd 100644
--- a/gdb/exec.c
+++ b/gdb/exec.c
@@ -49,8 +49,6 @@ void (*deprecated_file_changed_hook) (const char *);
 
 /* Prototypes for local functions */
 
-static void set_section_command (char *, int);
-
 static void exec_files_info (struct target_ops *);
 
 static void init_exec_ops (void);
@@ -957,10 +955,10 @@ exec_files_info (struct target_ops *t)
 }
 
 static void
-set_section_command (char *args, int from_tty)
+set_section_command (const char *args, int from_tty)
 {
   struct target_section *p;
-  char *secname;
+  const char *secname;
   unsigned seclen;
   unsigned long secaddr;
   char secprint[100];
diff --git a/gdb/frame.h b/gdb/frame.h
index c751002..7c24c3a 100644
--- a/gdb/frame.h
+++ b/gdb/frame.h
@@ -790,7 +790,7 @@ extern void info_args_command (char *, int);
 
 extern void info_locals_command (char *, int);
 
-extern void return_command (char *, int);
+extern void return_command (const char *, int);
 
 /* Set FRAME's unwinder temporarily, so that we can call a sniffer.
    If sniffing fails, the caller should be sure to call
diff --git a/gdb/gcore.c b/gdb/gcore.c
index 69e5eb9..0d5dcca 100644
--- a/gdb/gcore.c
+++ b/gdb/gcore.c
@@ -141,7 +141,7 @@ write_gcore_file (bfd *obfd)
    Generate a core file from the inferior process.  */
 
 static void
-gcore_command (char *args, int from_tty)
+gcore_command (const char *args, int from_tty)
 {
   gdb::unique_xmalloc_ptr<char> corefilename;
 
diff --git a/gdb/guile/guile.c b/gdb/guile/guile.c
index 5c514f6..bc3c45f 100644
--- a/gdb/guile/guile.c
+++ b/gdb/guile/guile.c
@@ -161,7 +161,7 @@ const struct extension_language_ops guile_extension_ops =
 /* Implementation of the gdb "guile-repl" command.  */
 
 static void
-guile_repl_command (char *arg, int from_tty)
+guile_repl_command (const char *arg, int from_tty)
 {
   scoped_restore restore_async = make_scoped_restore (&current_ui->async, 0);
 
@@ -189,7 +189,7 @@ guile_repl_command (char *arg, int from_tty)
    TODO: Add the result to Guile's history?  */
 
 static void
-guile_command (char *arg, int from_tty)
+guile_command (const char *arg, int from_tty)
 {
   scoped_restore restore_async = make_scoped_restore (&current_ui->async, 0);
 
@@ -390,7 +390,7 @@ gdbscm_target_config (void)
    commands. */
 
 static void
-guile_repl_command (char *arg, int from_tty)
+guile_repl_command (const char *arg, int from_tty)
 {
   arg = skip_spaces (arg);
   if (arg && *arg)
@@ -399,7 +399,7 @@ guile_repl_command (char *arg, int from_tty)
 }
 
 static void
-guile_command (char *arg, int from_tty)
+guile_command (const char *arg, int from_tty)
 {
   arg = skip_spaces (arg);
   if (arg && *arg)
diff --git a/gdb/infcmd.c b/gdb/infcmd.c
index 71e4768..33244ee 100644
--- a/gdb/infcmd.c
+++ b/gdb/infcmd.c
@@ -66,29 +66,11 @@ static void info_registers_command (char *, int);
 
 static void until_next_command (int);
 
-static void until_command (char *, int);
-
-static void path_command (char *, int);
-
 static void info_float_command (char *, int);
 
-static void disconnect_command (char *, int);
-
 static void info_program_command (char *, int);
 
-static void finish_command (char *, int);
-
-static void signal_command (char *, int);
-
-static void jump_command (char *, int);
-
-static void step_1 (int, int, char *);
-
-static void next_command (char *, int);
-
-static void step_command (char *, int);
-
-static void run_command (char *, int);
+static void step_1 (int, int, const char *);
 
 #define ERROR_NO_INFERIOR \
    if (!target_has_execution) error (_("The program is not being run."));
@@ -204,7 +186,7 @@ get_inferior_args (void)
    NEWARGS is not transferred.  */
 
 void
-set_inferior_args (char *newargs)
+set_inferior_args (const char *newargs)
 {
   xfree (current_inferior ()->args);
   current_inferior ()->args = newargs ? xstrdup (newargs) : NULL;
@@ -585,7 +567,7 @@ enum run_how
    requested by RUN_HOW.  */
 
 static void
-run_command_1 (char *args, int from_tty, enum run_how run_how)
+run_command_1 (const char *args, int from_tty, enum run_how run_how)
 {
   const char *exec_file;
   struct cleanup *old_chain;
@@ -708,7 +690,7 @@ run_command_1 (char *args, int from_tty, enum run_how run_how)
 }
 
 static void
-run_command (char *args, int from_tty)
+run_command (const char *args, int from_tty)
 {
   run_command_1 (args, from_tty, RUN_NORMAL);
 }
@@ -717,7 +699,7 @@ run_command (char *args, int from_tty)
    program.  */
 
 static void
-start_command (char *args, int from_tty)
+start_command (const char *args, int from_tty)
 {
   /* Some languages such as Ada need to search inside the program
      minimal symbols for the location where to put the temporary
@@ -733,7 +715,7 @@ start_command (char *args, int from_tty)
    instruction.  */
 
 static void
-starti_command (char *args, int from_tty)
+starti_command (const char *args, int from_tty)
 {
   run_command_1 (args, from_tty, RUN_STOP_AT_FIRST_INSN);
 } 
@@ -843,7 +825,7 @@ continue_1 (int all_threads)
 /* continue [-a] [proceed-count] [&]  */
 
 static void
-continue_command (char *args, int from_tty)
+continue_command (const char *args, int from_tty)
 {
   int async_exec;
   int all_threads = 0;
@@ -949,7 +931,7 @@ set_step_frame (void)
 /* Step until outside of current statement.  */
 
 static void
-step_command (char *count_string, int from_tty)
+step_command (const char *count_string, int from_tty)
 {
   step_1 (0, 0, count_string);
 }
@@ -957,7 +939,7 @@ step_command (char *count_string, int from_tty)
 /* Likewise, but skip over subroutine calls as if single instructions.  */
 
 static void
-next_command (char *count_string, int from_tty)
+next_command (const char *count_string, int from_tty)
 {
   step_1 (1, 0, count_string);
 }
@@ -965,13 +947,13 @@ next_command (char *count_string, int from_tty)
 /* Likewise, but step only one instruction.  */
 
 static void
-stepi_command (char *count_string, int from_tty)
+stepi_command (const char *count_string, int from_tty)
 {
   step_1 (0, 1, count_string);
 }
 
 static void
-nexti_command (char *count_string, int from_tty)
+nexti_command (const char *count_string, int from_tty)
 {
   step_1 (1, 1, count_string);
 }
@@ -1054,7 +1036,7 @@ step_command_fsm_prepare (struct step_command_fsm *sm,
 static int prepare_one_step (struct step_command_fsm *sm);
 
 static void
-step_1 (int skip_subroutines, int single_inst, char *count_string)
+step_1 (int skip_subroutines, int single_inst, const char *count_string)
 {
   int count;
   int async_exec;
@@ -1242,7 +1224,7 @@ prepare_one_step (struct step_command_fsm *sm)
 /* Continue program at specified address.  */
 
 static void
-jump_command (char *arg, int from_tty)
+jump_command (const char *arg, int from_tty)
 {
   struct gdbarch *gdbarch = get_current_arch ();
   CORE_ADDR addr;
@@ -1323,7 +1305,7 @@ jump_command (char *arg, int from_tty)
 /* Continue program giving it specified signal.  */
 
 static void
-signal_command (char *signum_exp, int from_tty)
+signal_command (const char *signum_exp, int from_tty)
 {
   enum gdb_signal oursig;
   int async_exec;
@@ -1420,7 +1402,7 @@ signal_command (char *signum_exp, int from_tty)
 /* Queue a signal to be delivered to the current thread.  */
 
 static void
-queue_signal_command (char *signum_exp, int from_tty)
+queue_signal_command (const char *signum_exp, int from_tty)
 {
   enum gdb_signal oursig;
   struct thread_info *tp;
@@ -1601,7 +1583,7 @@ until_next_command (int from_tty)
 }
 
 static void
-until_command (char *arg, int from_tty)
+until_command (const char *arg, int from_tty)
 {
   int async_exec;
 
@@ -1623,7 +1605,7 @@ until_command (char *arg, int from_tty)
 }
 
 static void
-advance_command (char *arg, int from_tty)
+advance_command (const char *arg, int from_tty)
 {
   int async_exec;
 
@@ -2003,7 +1985,7 @@ skip_finish_frames (struct frame_info *frame)
    frame will return to, then continue.  */
 
 static void
-finish_command (char *arg, int from_tty)
+finish_command (const char *arg, int from_tty)
 {
   struct frame_info *frame;
   int async_exec;
@@ -2291,7 +2273,7 @@ path_info (const char *args, int from_tty)
 /* Add zero or more directories to the front of the execution path.  */
 
 static void
-path_command (char *dirname, int from_tty)
+path_command (const char *dirname, int from_tty)
 {
   char *exec_path;
   const char *env;
@@ -2815,7 +2797,7 @@ attach_command_continuation_free_args (void *args)
    and allows us to start debugging it.  */
 
 void
-attach_command (char *args, int from_tty)
+attach_command (const char *args, int from_tty)
 {
   int async_exec;
   struct target_ops *attach_target;
@@ -3035,7 +3017,7 @@ detach_command (const char *args, int from_tty)
    stopped processes on some native platforms (e.g. GNU/Linux).  */
 
 static void
-disconnect_command (char *args, int from_tty)
+disconnect_command (const char *args, int from_tty)
 {
   dont_repeat ();		/* Not for the faint of heart.  */
   query_if_trace_running (from_tty);
@@ -3079,7 +3061,7 @@ interrupt_target_1 (int all_threads)
    if the `-a' switch is used.  */
 
 static void
-interrupt_command (char *args, int from_tty)
+interrupt_command (const char *args, int from_tty)
 {
   if (target_can_async_p ())
     {
diff --git a/gdb/inferior.c b/gdb/inferior.c
index ba8efe2..0c60d30 100644
--- a/gdb/inferior.c
+++ b/gdb/inferior.c
@@ -726,7 +726,7 @@ info_inferiors_command (char *args, int from_tty)
 /* remove-inferior ID */
 
 static void
-remove_inferior_command (char *args, int from_tty)
+remove_inferior_command (const char *args, int from_tty)
 {
   if (args == NULL || *args == '\0')
     error (_("Requires an argument (inferior id(s) to remove)"));
@@ -790,7 +790,7 @@ add_inferior_with_spaces (void)
 /* add-inferior [-copies N] [-exec FILENAME]  */
 
 static void
-add_inferior_command (char *args, int from_tty)
+add_inferior_command (const char *args, int from_tty)
 {
   int i, copies = 1;
   gdb::unique_xmalloc_ptr<char> exec;
@@ -852,7 +852,7 @@ add_inferior_command (char *args, int from_tty)
 /* clone-inferior [-copies N] [ID] */
 
 static void
-clone_inferior_command (char *args, int from_tty)
+clone_inferior_command (const char *args, int from_tty)
 {
   int i, copies = 1;
   struct inferior *orginf = NULL;
diff --git a/gdb/inferior.h b/gdb/inferior.h
index 39a8877..f70c0ac 100644
--- a/gdb/inferior.h
+++ b/gdb/inferior.h
@@ -152,11 +152,11 @@ extern void setup_inferior (int from_tty);
 
 extern void post_create_inferior (struct target_ops *, int);
 
-extern void attach_command (char *, int);
+extern void attach_command (const char *, int);
 
 extern char *get_inferior_args (void);
 
-extern void set_inferior_args (char *);
+extern void set_inferior_args (const char *);
 
 extern void set_inferior_args_vector (int, char **);
 
diff --git a/gdb/infrun.c b/gdb/infrun.c
index d425664..b041ff1 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -72,8 +72,6 @@
 
 static void info_signals_command (char *, int);
 
-static void handle_command (char *, int);
-
 static void sig_print_info (enum gdb_signal);
 
 static void sig_print_header (void);
@@ -8468,7 +8466,7 @@ sig_print_info (enum gdb_signal oursig)
 /* Specify how various signals in the inferior should be handled.  */
 
 static void
-handle_command (char *args, int from_tty)
+handle_command (const char *args, int from_tty)
 {
   int digits, wordlen;
   int sigfirst, signum, siglast;
diff --git a/gdb/jit.c b/gdb/jit.c
index 7538684..28f63b0 100644
--- a/gdb/jit.c
+++ b/gdb/jit.c
@@ -208,7 +208,7 @@ jit_reader_load (const char *file_name)
 /* Provides the jit-reader-load command.  */
 
 static void
-jit_reader_load_command (char *args, int from_tty)
+jit_reader_load_command (const char *args, int from_tty)
 {
   if (args == NULL)
     error (_("No reader name provided."));
@@ -229,7 +229,7 @@ jit_reader_load_command (char *args, int from_tty)
 /* Provides the jit-reader-unload command.  */
 
 static void
-jit_reader_unload_command (char *args, int from_tty)
+jit_reader_unload_command (const char *args, int from_tty)
 {
   if (!loaded_jit_reader)
     error (_("No JIT reader loaded."));
diff --git a/gdb/linux-fork.c b/gdb/linux-fork.c
index 554cfae..c60d90c 100644
--- a/gdb/linux-fork.c
+++ b/gdb/linux-fork.c
@@ -668,7 +668,7 @@ inf_has_multiple_threads (void)
 }
 
 static void
-checkpoint_command (char *args, int from_tty)
+checkpoint_command (const char *args, int from_tty)
 {
   struct objfile *fork_objf;
   struct gdbarch *gdbarch;
@@ -761,7 +761,7 @@ linux_fork_context (struct fork_info *newfp, int from_tty)
 
 /* Switch inferior process (checkpoint) context, by checkpoint id.  */
 static void
-restart_command (char *args, int from_tty)
+restart_command (const char *args, int from_tty)
 {
   struct fork_info *fp;
 
diff --git a/gdb/memattr.c b/gdb/memattr.c
index 6ef8e39..0498664 100644
--- a/gdb/memattr.c
+++ b/gdb/memattr.c
@@ -251,10 +251,9 @@ user_mem_clear (void)
 
 
 static void
-mem_command (char *args, int from_tty)
+mem_command (const char *args, int from_tty)
 {
   CORE_ADDR lo, hi;
-  char *tok;
 
   if (!args)
     error_no_arg (_("No mem"));
@@ -273,41 +272,41 @@ mem_command (char *args, int from_tty)
 
   require_user_regions (from_tty);
 
-  tok = strtok (args, " \t");
-  if (!tok)
+  std::string tok = extract_arg (&args);
+  if (tok == "")
     error (_("no lo address"));
-  lo = parse_and_eval_address (tok);
+  lo = parse_and_eval_address (tok.c_str ());
 
-  tok = strtok (NULL, " \t");
-  if (!tok)
+  tok = extract_arg (&args);
+  if (tok == "")
     error (_("no hi address"));
-  hi = parse_and_eval_address (tok);
+  hi = parse_and_eval_address (tok.c_str ());
 
   mem_attrib attrib;
-  while ((tok = strtok (NULL, " \t")) != NULL)
+  while ((tok = extract_arg (&args)) != "")
     {
-      if (strcmp (tok, "rw") == 0)
+      if (tok == "rw")
 	attrib.mode = MEM_RW;
-      else if (strcmp (tok, "ro") == 0)
+      else if (tok == "ro")
 	attrib.mode = MEM_RO;
-      else if (strcmp (tok, "wo") == 0)
+      else if (tok == "wo")
 	attrib.mode = MEM_WO;
 
-      else if (strcmp (tok, "8") == 0)
+      else if (tok == "8")
 	attrib.width = MEM_WIDTH_8;
-      else if (strcmp (tok, "16") == 0)
+      else if (tok == "16")
 	{
 	  if ((lo % 2 != 0) || (hi % 2 != 0))
 	    error (_("region bounds not 16 bit aligned"));
 	  attrib.width = MEM_WIDTH_16;
 	}
-      else if (strcmp (tok, "32") == 0)
+      else if (tok == "32")
 	{
 	  if ((lo % 4 != 0) || (hi % 4 != 0))
 	    error (_("region bounds not 32 bit aligned"));
 	  attrib.width = MEM_WIDTH_32;
 	}
-      else if (strcmp (tok, "64") == 0)
+      else if (tok == "64")
 	{
 	  if ((lo % 8 != 0) || (hi % 8 != 0))
 	    error (_("region bounds not 64 bit aligned"));
@@ -315,26 +314,26 @@ mem_command (char *args, int from_tty)
 	}
 
 #if 0
-      else if (strcmp (tok, "hwbreak") == 0)
+      else if (tok == "hwbreak")
 	attrib.hwbreak = 1;
-      else if (strcmp (tok, "swbreak") == 0)
+      else if (tok == "swbreak")
 	attrib.hwbreak = 0;
 #endif
 
-      else if (strcmp (tok, "cache") == 0)
+      else if (tok == "cache")
 	attrib.cache = 1;
-      else if (strcmp (tok, "nocache") == 0)
+      else if (tok == "nocache")
 	attrib.cache = 0;
 
 #if 0
-      else if (strcmp (tok, "verify") == 0)
+      else if (tok == "verify")
 	attrib.verify = 1;
-      else if (strcmp (tok, "noverify") == 0)
+      else if (tok == "noverify")
 	attrib.verify = 0;
 #endif
 
       else
-	error (_("unknown attribute: %s"), tok);
+	error (_("unknown attribute: %s"), tok.c_str ());
     }
 
   create_user_mem_region (lo, hi, attrib);
diff --git a/gdb/objc-lang.c b/gdb/objc-lang.c
index 0423832..43abf13 100644
--- a/gdb/objc-lang.c
+++ b/gdb/objc-lang.c
@@ -1184,7 +1184,7 @@ find_imps (const char *method, VEC (const_char_ptr) **symbol_names)
 }
 
 static void 
-print_object_command (char *args, int from_tty)
+print_object_command (const char *args, int from_tty)
 {
   struct value *object, *function, *description;
   CORE_ADDR string_addr, object_addr;
diff --git a/gdb/printcmd.c b/gdb/printcmd.c
index 51e3d38..48ff903 100644
--- a/gdb/printcmd.c
+++ b/gdb/printcmd.c
@@ -1214,14 +1214,14 @@ print_command_1 (const char *exp, int voidprint)
 }
 
 static void
-print_command (char *exp, int from_tty)
+print_command (const char *exp, int from_tty)
 {
   print_command_1 (exp, 1);
 }
 
 /* Same as print, except it doesn't print void results.  */
 static void
-call_command (char *exp, int from_tty)
+call_command (const char *exp, int from_tty)
 {
   print_command_1 (exp, 0);
 }
@@ -1229,7 +1229,7 @@ call_command (char *exp, int from_tty)
 /* Implementation of the "output" command.  */
 
 static void
-output_command (char *exp, int from_tty)
+output_command (const char *exp, int from_tty)
 {
   output_command_const (exp, from_tty);
 }
@@ -1295,14 +1295,6 @@ set_command (const char *exp, int from_tty)
   evaluate_expression (expr.get ());
 }
 
-/* Temporary non-const version of set_command.  */
-
-static void
-non_const_set_command (char *exp, int from_tty)
-{
-  set_command (exp, from_tty);
-}
-
 static void
 info_symbol_command (char *arg, int from_tty)
 {
@@ -1619,7 +1611,7 @@ info_address_command (char *exp, int from_tty)
 
 
 static void
-x_command (char *exp, int from_tty)
+x_command (const char *exp, int from_tty)
 {
   struct format_data fmt;
   struct value *val;
@@ -1702,7 +1694,7 @@ x_command (char *exp, int from_tty)
    Specify the expression.  */
 
 static void
-display_command (char *arg, int from_tty)
+display_command (const char *arg, int from_tty)
 {
   struct format_data fmt;
   struct display *newobj;
@@ -2608,7 +2600,7 @@ ui_printf (const char *arg, struct ui_file *stream)
 /* Implement the "printf" command.  */
 
 static void
-printf_command (char *arg, int from_tty)
+printf_command (const char *arg, int from_tty)
 {
   ui_printf (arg, gdb_stdout);
   gdb_flush (gdb_stdout);
@@ -2617,7 +2609,7 @@ printf_command (char *arg, int from_tty)
 /* Implement the "eval" command.  */
 
 static void
-eval_command (char *arg, int from_tty)
+eval_command (const char *arg, int from_tty)
 {
   string_file stb;
 
@@ -2722,7 +2714,7 @@ With a subcommand, this command modifies parts of the gdb environment.\n\
 You can see these environment settings with the \"show\" command."),
 		  &setlist, "set ", 1, &cmdlist);
   if (dbx_commands)
-    add_com ("assign", class_vars, non_const_set_command, _("\
+    add_com ("assign", class_vars, set_command, _("\
 Evaluate expression EXP and assign result to variable VAR, using assignment\n\
 syntax appropriate for the current language (VAR = EXP or VAR := EXP for\n\
 example).  VAR may be a debugger \"convenience\" variable (names starting\n\
diff --git a/gdb/procfs.c b/gdb/procfs.c
index fb3fa58..333a825 100644
--- a/gdb/procfs.c
+++ b/gdb/procfs.c
@@ -5224,7 +5224,7 @@ proc_trace_syscalls_1 (procinfo *pi, int syscallnum, int entry_or_exit,
 }
 
 static void
-proc_trace_syscalls (char *args, int from_tty, int entry_or_exit, int mode)
+proc_trace_syscalls (const char *args, int from_tty, int entry_or_exit, int mode)
 {
   procinfo *pi;
 
@@ -5244,25 +5244,25 @@ proc_trace_syscalls (char *args, int from_tty, int entry_or_exit, int mode)
 }
 
 static void
-proc_trace_sysentry_cmd (char *args, int from_tty)
+proc_trace_sysentry_cmd (const char *args, int from_tty)
 {
   proc_trace_syscalls (args, from_tty, PR_SYSENTRY, FLAG_SET);
 }
 
 static void
-proc_trace_sysexit_cmd (char *args, int from_tty)
+proc_trace_sysexit_cmd (const char *args, int from_tty)
 {
   proc_trace_syscalls (args, from_tty, PR_SYSEXIT, FLAG_SET);
 }
 
 static void
-proc_untrace_sysentry_cmd (char *args, int from_tty)
+proc_untrace_sysentry_cmd (const char *args, int from_tty)
 {
   proc_trace_syscalls (args, from_tty, PR_SYSENTRY, FLAG_RESET);
 }
 
 static void
-proc_untrace_sysexit_cmd (char *args, int from_tty)
+proc_untrace_sysexit_cmd (const char *args, int from_tty)
 {
   proc_trace_syscalls (args, from_tty, PR_SYSEXIT, FLAG_RESET);
 }
diff --git a/gdb/python/python.c b/gdb/python/python.c
index 5bb642a..88a31b0 100644
--- a/gdb/python/python.c
+++ b/gdb/python/python.c
@@ -289,7 +289,7 @@ eval_python_command (const char *command)
 /* Implementation of the gdb "python-interactive" command.  */
 
 static void
-python_interactive_command (char *arg, int from_tty)
+python_interactive_command (const char *arg, int from_tty)
 {
   struct ui *ui = current_ui;
   int err;
@@ -404,7 +404,7 @@ gdbpy_eval_from_control_command (const struct extension_language_defn *extlang,
 /* Implementation of the gdb "python" command.  */
 
 static void
-python_command (char *arg, int from_tty)
+python_command (const char *arg, int from_tty)
 {
   gdbpy_enter enter_py (get_current_arch (), current_language);
 
@@ -1397,7 +1397,7 @@ gdbpy_free_type_printers (const struct extension_language_defn *extlang,
    command. */
 
 static void
-python_interactive_command (char *arg, int from_tty)
+python_interactive_command (const char *arg, int from_tty)
 {
   arg = skip_spaces (arg);
   if (arg && *arg)
@@ -1411,7 +1411,7 @@ python_interactive_command (char *arg, int from_tty)
 }
 
 static void
-python_command (char *arg, int from_tty)
+python_command (const char *arg, int from_tty)
 {
   python_interactive_command (arg, from_tty);
 }
diff --git a/gdb/regcache.c b/gdb/regcache.c
index 571aba1..9c68bdd 100644
--- a/gdb/regcache.c
+++ b/gdb/regcache.c
@@ -1313,7 +1313,7 @@ regcache::debug_print_register (const char *func,  int regno)
 }
 
 static void
-reg_flush_command (char *command, int from_tty)
+reg_flush_command (const char *command, int from_tty)
 {
   /* Force-flush the register cache.  */
   registers_changed ();
diff --git a/gdb/remote-sim.c b/gdb/remote-sim.c
index d6efa75..a684d32 100644
--- a/gdb/remote-sim.c
+++ b/gdb/remote-sim.c
@@ -1179,7 +1179,7 @@ gdbsim_mourn_inferior (struct target_ops *target)
    simulator must do any command interpretation work.  */
 
 void
-simulator_command (char *args, int from_tty)
+simulator_command (const char *args, int from_tty)
 {
   struct sim_inferior_data *sim_data;
 
diff --git a/gdb/remote.c b/gdb/remote.c
index 57dbd1e..62b87c4 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -10918,7 +10918,7 @@ static void init_remote_threadtests (void);
 #define SAMPLE_THREAD  0x05060708	/* Truncated 64 bit threadid.  */
 
 static void
-threadset_test_cmd (char *cmd, int tty)
+threadset_test_cmd (const char *cmd, int tty)
 {
   int sample_thread = SAMPLE_THREAD;
 
@@ -10928,7 +10928,7 @@ threadset_test_cmd (char *cmd, int tty)
 
 
 static void
-threadalive_test (char *cmd, int tty)
+threadalive_test (const char *cmd, int tty)
 {
   int sample_thread = SAMPLE_THREAD;
   int pid = ptid_get_pid (inferior_ptid);
@@ -10953,7 +10953,7 @@ output_threadid (char *title, threadref *ref)
 }
 
 static void
-threadlist_test_cmd (char *cmd, int tty)
+threadlist_test_cmd (const char *cmd, int tty)
 {
   int startflag = 1;
   threadref nextthread;
@@ -10998,7 +10998,7 @@ get_and_display_threadinfo (threadref *ref)
 }
 
 static void
-threadinfo_test_cmd (char *cmd, int tty)
+threadinfo_test_cmd (const char *cmd, int tty)
 {
   int athread = SAMPLE_THREAD;
   threadref thread;
@@ -11018,7 +11018,7 @@ thread_display_step (threadref *ref, void *context)
 }
 
 static void
-threadlist_update_test_cmd (char *cmd, int tty)
+threadlist_update_test_cmd (const char *cmd, int tty)
 {
   printf_filtered ("Remote Threadlist update test\n");
   remote_threadlist_iterator (thread_display_step, 0, CRAZY_MAX_THREADS);
diff --git a/gdb/reverse.c b/gdb/reverse.c
index 2b303f7..28410a8 100644
--- a/gdb/reverse.c
+++ b/gdb/reverse.c
@@ -36,7 +36,7 @@
    Used to implement reverse-next etc. commands.  */
 
 static void
-exec_reverse_once (const char *cmd, char *args, int from_tty)
+exec_reverse_once (const char *cmd, const char *args, int from_tty)
 {
   enum exec_direction_kind dir = execution_direction;
 
@@ -54,37 +54,37 @@ exec_reverse_once (const char *cmd, char *args, int from_tty)
 }
 
 static void
-reverse_step (char *args, int from_tty)
+reverse_step (const char *args, int from_tty)
 {
   exec_reverse_once ("step", args, from_tty);
 }
 
 static void
-reverse_stepi (char *args, int from_tty)
+reverse_stepi (const char *args, int from_tty)
 {
   exec_reverse_once ("stepi", args, from_tty);
 }
 
 static void
-reverse_next (char *args, int from_tty)
+reverse_next (const char *args, int from_tty)
 {
   exec_reverse_once ("next", args, from_tty);
 }
 
 static void
-reverse_nexti (char *args, int from_tty)
+reverse_nexti (const char *args, int from_tty)
 {
   exec_reverse_once ("nexti", args, from_tty);
 }
 
 static void
-reverse_continue (char *args, int from_tty)
+reverse_continue (const char *args, int from_tty)
 {
   exec_reverse_once ("continue", args, from_tty);
 }
 
 static void
-reverse_finish (char *args, int from_tty)
+reverse_finish (const char *args, int from_tty)
 {
   exec_reverse_once ("finish", args, from_tty);
 }
@@ -117,7 +117,7 @@ static int bookmark_count;
    Up to us to free it as required.  */
 
 static void
-save_bookmark_command (char *args, int from_tty)
+save_bookmark_command (const char *args, int from_tty)
 {
   /* Get target's idea of a bookmark.  */
   gdb_byte *bookmark_id = target_get_bookmark (args, from_tty);
@@ -230,11 +230,11 @@ delete_bookmark_command (const char *args, int from_tty)
 /* Implement "goto-bookmark" command.  */
 
 static void
-goto_bookmark_command (char *args, int from_tty)
+goto_bookmark_command (const char *args, int from_tty)
 {
   struct bookmark *b;
   unsigned long num;
-  char *p = args;
+  const char *p = args;
 
   if (args == NULL || args[0] == '\0')
     error (_("Command requires an argument."));
diff --git a/gdb/solib.c b/gdb/solib.c
index f9f7217..c70b9d8 100644
--- a/gdb/solib.c
+++ b/gdb/solib.c
@@ -1246,7 +1246,7 @@ in_solib_dynsym_resolve_code (CORE_ADDR pc)
 /* Implements the "sharedlibrary" command.  */
 
 static void
-sharedlibrary_command (char *args, int from_tty)
+sharedlibrary_command (const char *args, int from_tty)
 {
   dont_repeat ();
   solib_add (args, from_tty, 1);
@@ -1258,7 +1258,7 @@ sharedlibrary_command (char *args, int from_tty)
    are not discarded.  Also called from remote.c.  */
 
 void
-no_shared_libraries (char *ignored, int from_tty)
+no_shared_libraries (const char *ignored, int from_tty)
 {
   /* The order of the two routines below is important: clear_solib notifies
      the solib_unloaded observers, and some of these observers might need
diff --git a/gdb/solib.h b/gdb/solib.h
index e91fb75..35f956b 100644
--- a/gdb/solib.h
+++ b/gdb/solib.h
@@ -71,7 +71,7 @@ extern int in_solib_dynsym_resolve_code (CORE_ADDR);
 
 /* Discard symbols that were auto-loaded from shared libraries.  */
 
-extern void no_shared_libraries (char *ignored, int from_tty);
+extern void no_shared_libraries (const char *ignored, int from_tty);
 
 /* Set the solib operations for GDBARCH to NEW_OPS.  */
 
diff --git a/gdb/source.c b/gdb/source.c
index 4ae2ba2..e67209e 100644
--- a/gdb/source.c
+++ b/gdb/source.c
@@ -52,10 +52,6 @@
 
 static int get_filename_and_charpos (struct symtab *, char **);
 
-static void reverse_search_command (char *, int);
-
-static void forward_search_command (char *, int);
-
 static void info_line_command (char *, int);
 
 static void info_source_command (char *, int);
@@ -1591,7 +1587,7 @@ info_line_command (char *arg, int from_tty)
 /* Commands to search the source file for a regexp.  */
 
 static void
-forward_search_command (char *regex, int from_tty)
+forward_search_command (const char *regex, int from_tty)
 {
   int c;
   int desc;
@@ -1676,7 +1672,7 @@ forward_search_command (char *regex, int from_tty)
 }
 
 static void
-reverse_search_command (char *regex, int from_tty)
+reverse_search_command (const char *regex, int from_tty)
 {
   int c;
   int desc;
diff --git a/gdb/stack.c b/gdb/stack.c
index 6256bbe..592f026 100644
--- a/gdb/stack.c
+++ b/gdb/stack.c
@@ -1844,11 +1844,10 @@ backtrace_command_1 (const char *count_exp, int show_locals, int no_filters,
 }
 
 static void
-backtrace_command (char *arg_in, int from_tty)
+backtrace_command (const char *arg, int from_tty)
 {
   int fulltrace_arg = -1, arglen = 0, argc = 0, no_filters  = -1;
   int user_arg = 0;
-  const char *arg = arg_in;
 
   std::string reconstructed_arg;
   if (arg)
@@ -1904,6 +1903,14 @@ backtrace_command (char *arg_in, int from_tty)
 		       no_filters >= 0 /* no frame-filters */, from_tty);
 }
 
+/* Temporary non-const overload.  */
+
+static void
+backtrace_command (char *arg, int from_tty)
+{
+  backtrace_command ((const char *) arg, from_tty);
+}
+
 /* Iterate over the local variables of a block B, calling CB with
    CB_DATA.  */
 
@@ -2281,7 +2288,7 @@ select_frame_command (const char *level_exp, int from_tty)
    the selected frame.  */
 
 static void
-frame_command (char *level_exp, int from_tty)
+frame_command (const char *level_exp, int from_tty)
 {
   struct frame_info *prev_frame = get_selected_frame_if_set ();
 
@@ -2311,13 +2318,13 @@ up_silently_base (const char *count_exp)
 }
 
 static void
-up_silently_command (char *count_exp, int from_tty)
+up_silently_command (const char *count_exp, int from_tty)
 {
   up_silently_base (count_exp);
 }
 
 static void
-up_command (char *count_exp, int from_tty)
+up_command (const char *count_exp, int from_tty)
 {
   up_silently_base (count_exp);
   observer_notify_user_selected_context_changed (USER_SELECTED_FRAME);
@@ -2350,20 +2357,20 @@ down_silently_base (const char *count_exp)
 }
 
 static void
-down_silently_command (char *count_exp, int from_tty)
+down_silently_command (const char *count_exp, int from_tty)
 {
   down_silently_base (count_exp);
 }
 
 static void
-down_command (char *count_exp, int from_tty)
+down_command (const char *count_exp, int from_tty)
 {
   down_silently_base (count_exp);
   observer_notify_user_selected_context_changed (USER_SELECTED_FRAME);
 }
 
 void
-return_command (char *retval_exp, int from_tty)
+return_command (const char *retval_exp, int from_tty)
 {
   /* Initialize it just to avoid a GCC false warning.  */
   enum return_value_convention rv_conv = RETURN_VALUE_STRUCT_CONVENTION;
@@ -2498,7 +2505,7 @@ struct function_bounds
 };
 
 static void
-func_command (char *arg, int from_tty)
+func_command (const char *arg, int from_tty)
 {
   struct frame_info *frame;
   int found = 0;
diff --git a/gdb/symtab.c b/gdb/symtab.c
index db70590..d02b707 100644
--- a/gdb/symtab.c
+++ b/gdb/symtab.c
@@ -69,7 +69,7 @@
 
 /* Forward declarations for local functions.  */
 
-static void rbreak_command (char *, int);
+static void rbreak_command (const char *, int);
 
 static int find_line_common (struct linetable *, int, int *, int);
 
@@ -4436,7 +4436,7 @@ print_msymbol_info (struct bound_minimal_symbol msymbol)
    matches.  */
 
 static void
-symtab_symbol_info (char *regexp, enum search_domain kind, int from_tty)
+symtab_symbol_info (const char *regexp, enum search_domain kind, int from_tty)
 {
   static const char * const classnames[] =
     {"variable", "function", "type"};
@@ -4480,6 +4480,14 @@ symtab_symbol_info (char *regexp, enum search_domain kind, int from_tty)
 }
 
 static void
+info_variables_command (const char *regexp, int from_tty)
+{
+  symtab_symbol_info (regexp, VARIABLES_DOMAIN, from_tty);
+}
+
+/* Temporary non-const overload.  */
+
+static void
 info_variables_command (char *regexp, int from_tty)
 {
   symtab_symbol_info (regexp, VARIABLES_DOMAIN, from_tty);
@@ -4507,7 +4515,7 @@ rbreak_command_wrapper (char *regexp, int from_tty)
 }
 
 static void
-rbreak_command (char *regexp, int from_tty)
+rbreak_command (const char *regexp, int from_tty)
 {
   std::string string;
   const char **files = NULL;
@@ -4516,7 +4524,7 @@ rbreak_command (char *regexp, int from_tty)
 
   if (regexp)
     {
-      char *colon = strchr (regexp, ':');
+      const char *colon = strchr (regexp, ':');
 
       if (colon && *(colon + 1) != ':')
 	{
diff --git a/gdb/target.c b/gdb/target.c
index bd81fcd..93bb6e9 100644
--- a/gdb/target.c
+++ b/gdb/target.c
@@ -3798,8 +3798,7 @@ default_rcmd (struct target_ops *self, const char *command,
 }
 
 static void
-do_monitor_command (char *cmd,
-		 int from_tty)
+do_monitor_command (const char *cmd, int from_tty)
 {
   target_rcmd (cmd, gdb_stdtarg);
 }
@@ -3808,7 +3807,7 @@ do_monitor_command (char *cmd,
    ignored.  */
 
 void
-flash_erase_command (char *cmd, int from_tty)
+flash_erase_command (const char *cmd, int from_tty)
 {
   /* Used to communicate termination of flash operations to the target.  */
   bool found_flash_region = false;
diff --git a/gdb/target.h b/gdb/target.h
index e7577e1..1683af6 100644
--- a/gdb/target.h
+++ b/gdb/target.h
@@ -1469,7 +1469,7 @@ extern int target_write_raw_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
 std::vector<mem_region> target_memory_map (void);
 
 /* Erases all flash memory regions on the target.  */
-void flash_erase_command (char *cmd, int from_tty);
+void flash_erase_command (const char *cmd, int from_tty);
 
 /* Erase the specified flash region.  */
 void target_flash_erase (ULONGEST address, LONGEST length);
diff --git a/gdb/top.c b/gdb/top.c
index 14abfec..8ebdc07 100644
--- a/gdb/top.c
+++ b/gdb/top.c
@@ -1677,7 +1677,7 @@ input_interactive_p (struct ui *ui)
 }
 
 static void
-dont_repeat_command (char *ignored, int from_tty)
+dont_repeat_command (const char *ignored, int from_tty)
 {
   /* Can't call dont_repeat here because we're not necessarily reading
      from stdin.  */
diff --git a/gdb/top.h b/gdb/top.h
index ab65ddb..66f72df 100644
--- a/gdb/top.h
+++ b/gdb/top.h
@@ -230,7 +230,7 @@ extern void init_history (void);
 extern void command_loop (void);
 extern int quit_confirm (void);
 extern void quit_force (int *, int);
-extern void quit_command (char *, int);
+extern void quit_command (const char *, int);
 extern void quit_cover (void);
 extern void execute_command (char *, int);
 
diff --git a/gdb/tracefile.c b/gdb/tracefile.c
index 93d8816..6fa083b 100644
--- a/gdb/tracefile.c
+++ b/gdb/tracefile.c
@@ -306,7 +306,7 @@ trace_save (const char *filename, struct trace_file_writer *writer,
 }
 
 static void
-tsave_command (char *args, int from_tty)
+tsave_command (const char *args, int from_tty)
 {
   int target_does_save = 0;
   char **argv;
diff --git a/gdb/tracepoint.c b/gdb/tracepoint.c
index 78f4c86..3cae620 100644
--- a/gdb/tracepoint.c
+++ b/gdb/tracepoint.c
@@ -354,11 +354,11 @@ validate_trace_state_variable_name (const char *name)
    evaluate into an initial value.  */
 
 static void
-trace_variable_command (char *args, int from_tty)
+trace_variable_command (const char *args, int from_tty)
 {
   LONGEST initval = 0;
   struct trace_state_variable *tsv;
-  char *name_start, *p;
+  const char *name_start, *p;
 
   if (!args || !*args)
     error_no_arg (_("Syntax is $NAME [ = EXPR ]"));
@@ -526,25 +526,25 @@ save_trace_state_variables (struct ui_file *fp)
    which is always an error.  */
 
 static void
-end_actions_pseudocommand (char *args, int from_tty)
+end_actions_pseudocommand (const char *args, int from_tty)
 {
   error (_("This command cannot be used at the top level."));
 }
 
 static void
-while_stepping_pseudocommand (char *args, int from_tty)
+while_stepping_pseudocommand (const char *args, int from_tty)
 {
   error (_("This command can only be used in a tracepoint actions list."));
 }
 
 static void
-collect_pseudocommand (char *args, int from_tty)
+collect_pseudocommand (const char *args, int from_tty)
 {
   error (_("This command can only be used in a tracepoint actions list."));
 }
 
 static void
-teval_pseudocommand (char *args, int from_tty)
+teval_pseudocommand (const char *args, int from_tty)
 {
   error (_("This command can only be used in a tracepoint actions list."));
 }
@@ -593,7 +593,7 @@ decode_agent_options (const char *exp, int *trace_string)
 
 /* Enter a list of actions for a tracepoint.  */
 static void
-actions_command (char *args, int from_tty)
+actions_command (const char *args, int from_tty)
 {
   struct tracepoint *t;
 
@@ -1587,7 +1587,7 @@ trace_reset_local_state (void)
 }
 
 void
-start_tracing (char *notes)
+start_tracing (const char *notes)
 {
   VEC(breakpoint_p) *tp_vec = NULL;
   int ix;
@@ -1718,7 +1718,7 @@ start_tracing (char *notes)
    anybody else messing with the target.  */
 
 static void
-tstart_command (char *args, int from_tty)
+tstart_command (const char *args, int from_tty)
 {
   dont_repeat ();	/* Like "run", dangerous to repeat accidentally.  */
 
@@ -1738,7 +1738,7 @@ tstart_command (char *args, int from_tty)
    of the trace run's status.  */
 
 static void
-tstop_command (char *args, int from_tty)
+tstop_command (const char *args, int from_tty)
 {
   if (!current_trace_status ()->running)
     error (_("Trace is not running."));
@@ -1747,7 +1747,7 @@ tstop_command (char *args, int from_tty)
 }
 
 void
-stop_tracing (char *note)
+stop_tracing (const char *note)
 {
   int ret;
   VEC(breakpoint_p) *tp_vec = NULL;
@@ -1795,7 +1795,7 @@ stop_tracing (char *note)
 
 /* tstatus command */
 static void
-tstatus_command (char *args, int from_tty)
+tstatus_command (const char *args, int from_tty)
 {
   struct trace_status *ts = current_trace_status ();
   int status, ix;
@@ -2865,7 +2865,7 @@ all_tracepoint_actions_and_cleanup (struct breakpoint *t)
 /* The tdump command.  */
 
 static void
-tdump_command (char *args, int from_tty)
+tdump_command (const char *args, int from_tty)
 {
   int stepping_frame = 0;
   struct bp_location *loc;
diff --git a/gdb/tracepoint.h b/gdb/tracepoint.h
index 8364d38..18fdcf3 100644
--- a/gdb/tracepoint.h
+++ b/gdb/tracepoint.h
@@ -369,8 +369,8 @@ extern void trace_reset_local_state (void);
 
 extern void check_trace_running (struct trace_status *);
 
-extern void start_tracing (char *notes);
-extern void stop_tracing (char *notes);
+extern void start_tracing (const char *notes);
+extern void stop_tracing (const char *notes);
 
 extern void trace_status_mi (int on_stop);
 
diff --git a/gdb/tui/tui-layout.c b/gdb/tui/tui-layout.c
index fe68331..8b94ddf 100644
--- a/gdb/tui/tui-layout.c
+++ b/gdb/tui/tui-layout.c
@@ -62,7 +62,7 @@ static void show_source_disasm_command (void);
 static void show_data (enum tui_layout_type);
 static enum tui_layout_type next_layout (void);
 static enum tui_layout_type prev_layout (void);
-static void tui_layout_command (char *, int);
+static void tui_layout_command (const char *, int);
 static void extract_display_start_addr (struct gdbarch **, CORE_ADDR *);
 
 
@@ -492,12 +492,11 @@ extract_display_start_addr (struct gdbarch **gdbarch_p, CORE_ADDR *addr_p)
 
 
 static void
-tui_layout_command (char *arg, int from_tty)
+tui_layout_command (const char *arg, int from_tty)
 {
   /* Switch to the selected layout.  */
   if (tui_set_layout_by_name (arg) != TUI_SUCCESS)
     warning (_("Invalid layout specified.\n%s"), LAYOUT_USAGE);
-
 }
 
 /* Answer the previous layout to cycle to.  */
diff --git a/gdb/tui/tui-stack.c b/gdb/tui/tui-stack.c
index ce7c5ee..4a69b97 100644
--- a/gdb/tui/tui-stack.c
+++ b/gdb/tui/tui-stack.c
@@ -53,7 +53,7 @@ static int tui_set_locator_info (struct gdbarch *gdbarch,
 				 const char *procname,
                                  int lineno, CORE_ADDR addr);
 
-static void tui_update_command (char *, int);
+static void tui_update_command (const char *, int);
 
 
 /* Create the status line to display as much information as we can on
@@ -497,7 +497,7 @@ _initialize_tui_stack (void)
 
 /* Command to update the display with the current execution point.  */
 static void
-tui_update_command (char *arg, int from_tty)
+tui_update_command (const char *arg, int from_tty)
 {
   char cmd[sizeof("frame 0")];
 
diff --git a/gdb/tui/tui-win.c b/gdb/tui/tui-win.c
index 26b6b5e..9482646 100644
--- a/gdb/tui/tui-win.c
+++ b/gdb/tui/tui-win.c
@@ -61,16 +61,16 @@ static void make_invisible_and_set_new_height (struct tui_win_info *,
 static enum tui_status tui_adjust_win_heights (struct tui_win_info *, 
 					       int);
 static int new_height_ok (struct tui_win_info *, int);
-static void tui_set_tab_width_command (char *, int);
-static void tui_refresh_all_command (char *, int);
-static void tui_set_win_height_command (char *, int);
+static void tui_set_tab_width_command (const char *, int);
+static void tui_refresh_all_command (const char *, int);
+static void tui_set_win_height_command (const char *, int);
 static void tui_all_windows_info (char *, int);
-static void tui_set_focus_command (char *, int);
-static void tui_scroll_forward_command (char *, int);
-static void tui_scroll_backward_command (char *, int);
-static void tui_scroll_left_command (char *, int);
-static void tui_scroll_right_command (char *, int);
-static void parse_scrolling_args (char *, 
+static void tui_set_focus_command (const char *, int);
+static void tui_scroll_forward_command (const char *, int);
+static void tui_scroll_backward_command (const char *, int);
+static void tui_scroll_left_command (const char *, int);
+static void tui_scroll_right_command (const char *, int);
+static void parse_scrolling_args (const char *, 
 				  struct tui_win_info **, 
 				  int *);
 
@@ -980,7 +980,7 @@ tui_initialize_win (void)
 
 
 static void
-tui_scroll_forward_command (char *arg, int from_tty)
+tui_scroll_forward_command (const char *arg, int from_tty)
 {
   int num_to_scroll = 1;
   struct tui_win_info *win_to_scroll;
@@ -996,7 +996,7 @@ tui_scroll_forward_command (char *arg, int from_tty)
 
 
 static void
-tui_scroll_backward_command (char *arg, int from_tty)
+tui_scroll_backward_command (const char *arg, int from_tty)
 {
   int num_to_scroll = 1;
   struct tui_win_info *win_to_scroll;
@@ -1012,7 +1012,7 @@ tui_scroll_backward_command (char *arg, int from_tty)
 
 
 static void
-tui_scroll_left_command (char *arg, int from_tty)
+tui_scroll_left_command (const char *arg, int from_tty)
 {
   int num_to_scroll;
   struct tui_win_info *win_to_scroll;
@@ -1025,7 +1025,7 @@ tui_scroll_left_command (char *arg, int from_tty)
 
 
 static void
-tui_scroll_right_command (char *arg, int from_tty)
+tui_scroll_right_command (const char *arg, int from_tty)
 {
   int num_to_scroll;
   struct tui_win_info *win_to_scroll;
@@ -1039,7 +1039,7 @@ tui_scroll_right_command (char *arg, int from_tty)
 
 /* Set focus to the window named by 'arg'.  */
 static void
-tui_set_focus (char *arg, int from_tty)
+tui_set_focus (const char *arg, int from_tty)
 {
   if (arg != (char *) NULL)
     {
@@ -1078,7 +1078,7 @@ The window name specified must be valid and visible.\n"));
 }
 
 static void
-tui_set_focus_command (char *arg, int from_tty)
+tui_set_focus_command (const char *arg, int from_tty)
 {
   /* Make sure the curses mode is enabled.  */
   tui_enable ();
@@ -1109,7 +1109,7 @@ tui_all_windows_info (char *arg, int from_tty)
 
 
 static void
-tui_refresh_all_command (char *arg, int from_tty)
+tui_refresh_all_command (const char *arg, int from_tty)
 {
   /* Make sure the curses mode is enabled.  */
   tui_enable ();
@@ -1120,7 +1120,7 @@ tui_refresh_all_command (char *arg, int from_tty)
 
 /* Set the tab width of the specified window.  */
 static void
-tui_set_tab_width_command (char *arg, int from_tty)
+tui_set_tab_width_command (const char *arg, int from_tty)
 {
   /* Make sure the curses mode is enabled.  */
   tui_enable ();
@@ -1159,7 +1159,7 @@ tui_set_tab_width_command (char *arg, int from_tty)
 
 /* Set the height of the specified window.  */
 static void
-tui_set_win_height (char *arg, int from_tty)
+tui_set_win_height (const char *arg, int from_tty)
 {
   /* Make sure the curses mode is enabled.  */
   tui_enable ();
@@ -1240,7 +1240,7 @@ The window name specified must be valid and visible.\n"));
 
 /* Set the height of the specified window, with va_list.  */
 static void
-tui_set_win_height_command (char *arg, int from_tty)
+tui_set_win_height_command (const char *arg, int from_tty)
 {
   /* Make sure the curses mode is enabled.  */
   tui_enable ();
@@ -1646,7 +1646,7 @@ new_height_ok (struct tui_win_info *primary_win_info,
 
 
 static void
-parse_scrolling_args (char *arg, 
+parse_scrolling_args (const char *arg, 
 		      struct tui_win_info **win_to_scroll,
 		      int *num_to_scroll)
 {
diff --git a/gdb/typeprint.c b/gdb/typeprint.c
index 441cbb8..15810e4 100644
--- a/gdb/typeprint.c
+++ b/gdb/typeprint.c
@@ -37,12 +37,6 @@
 #include "extension.h"
 #include "completer.h"
 
-static void ptype_command (char *, int);
-
-static void whatis_command (char *, int);
-
-static void whatis_exp (char *, int);
-
 const struct type_print_options type_print_raw_options =
 {
   1,				/* raw */
@@ -405,7 +399,7 @@ error_unknown_type (const char *sym_print_name)
    show is passed to type_print.  */
 
 static void
-whatis_exp (char *exp, int show)
+whatis_exp (const char *exp, int show)
 {
   struct value *val;
   struct cleanup *old_chain;
@@ -524,7 +518,7 @@ whatis_exp (char *exp, int show)
 }
 
 static void
-whatis_command (char *exp, int from_tty)
+whatis_command (const char *exp, int from_tty)
 {
   /* Most of the time users do not want to see all the fields
      in a structure.  If they do they can use the "ptype" command.
@@ -535,7 +529,7 @@ whatis_command (char *exp, int from_tty)
 /* TYPENAME is either the name of a type, or an expression.  */
 
 static void
-ptype_command (char *type_name, int from_tty)
+ptype_command (const char *type_name, int from_tty)
 {
   whatis_exp (type_name, 1);
 }
diff --git a/gdb/value.c b/gdb/value.c
index ade5ebd..d8d40c2 100644
--- a/gdb/value.c
+++ b/gdb/value.c
@@ -2090,7 +2090,7 @@ static struct internalvar *internalvars;
 /* If the variable does not already exist create it and give it the
    value given.  If no value is given then the default is zero.  */
 static void
-init_if_undefined_command (char* args, int from_tty)
+init_if_undefined_command (const char* args, int from_tty)
 {
   struct internalvar* intvar;
 
diff --git a/gdb/windows-nat.c b/gdb/windows-nat.c
index 128edc2..b7ff5cc 100644
--- a/gdb/windows-nat.c
+++ b/gdb/windows-nat.c
@@ -859,7 +859,7 @@ windows_clear_solib (void)
 }
 
 static void
-signal_event_command (char *args, int from_tty)
+signal_event_command (const char *args, int from_tty)
 {
   uintptr_t event_id = 0;
   char *endargs = NULL;