gdb/

	* cli/cli-decode.c (set_cmd_prefix): New.
	(lookup_cmd_for_prefixlist): New.
	(add_prefix_cmd): Call set_cmd_prefix and update field 'prefix'
	of each cmd_list_element in *prefixlist.
	(add_setshow_cmd_full): set_cmd_prefix.
	(add_alias_cmd): Likewise.
	* cli/cli-decode.h (struct cmd_list_element) <prefix>: New field.
	Declare 'auto_boolean_enums'.
	* cli/cli-setshow.c: Include "observer.h".
	(notify_command_param_changed_p): New.
	(add_setshow_auto_boolean_cmd): Move auto_boolean_enums out.
	Remove 'static'.
	(do_setshow_command): Split it to ...
	(do_set_command, do_show_command): ... them.  New.
	(do_set_command): Call observer_notify_command_param_changed if
	notify_command_param_changed_p returns true.
	(cmd_show_list): Caller update.
	* auto-load.c (set_auto_load_cmd): Likewise.
	* remote.c (show_remote_cmd): Likewise.
	* cli/cli-setshow.h: Update declarations.
	* top.c (execute_command): Call do_set_command and do_show_command.

	* NEWS: Mention new MI notification.
	* mi/mi-interp.c: Declare mi_command_param_changed.
	(mi_interpreter_init): Attach mi_command_param_changed to
	observer command_param_changed.
	(mi_command_param_changed): New.
	Remove mi_suppress_breakpoint_notifications.
	Define global variable mi_suppress_notification.
	(mi_breakpoint_created): Update.
	(mi_breakpoint_deleted): Likewise.
	(mi_breakpoint_modified): Likewise.
	* mi/mi-main.c (mi_cmd_execute): Likewise.  Check command
	'gdb-set' and set mi_suppress_notification.
	* mi/mi-main.h: (mi_suppress_notification): New struct.

gdb/doc/

	* observer.texi: New observer command_param_changed.
	* gdb.texinfo (GDB/MI Async Records): Doc for '=cmd-param-changed'.

gdb/testsuite/

	* gdb.mi/mi-cmd-param-changed.exp: New.
	* gdb.mi/mi-cli.exp: Update for MI notification "=cmd-param-changed".
	* gdb.mi/mi-var-rtti.exp, gdb.mi/mi2-cli.exp: Likewise.
	* gdb.mi/mi2-prompt.exp: Likewise.

3 files changed, 56 insertions, 9 deletions

diff --git a/gdb/mi/mi-interp.c b/gdb/mi/mi-interp.c
index b487136..94df818 100644
--- a/gdb/mi/mi-interp.c
+++ b/gdb/mi/mi-interp.c
@@ -71,6 +71,7 @@ static void mi_about_to_proceed (void);
 static void mi_breakpoint_created (struct breakpoint *b);
 static void mi_breakpoint_deleted (struct breakpoint *b);
 static void mi_breakpoint_modified (struct breakpoint *b);
+static void mi_command_param_changed (const char *param, const char *value);
 
 static int report_initial_inferior (struct inferior *inf, void *closure);
 
@@ -128,6 +129,7 @@ mi_interpreter_init (struct interp *interp, int top_level)
       observer_attach_breakpoint_created (mi_breakpoint_created);
       observer_attach_breakpoint_deleted (mi_breakpoint_deleted);
       observer_attach_breakpoint_modified (mi_breakpoint_modified);
+      observer_attach_command_param_changed (mi_command_param_changed);
 
       /* The initial inferior is created before this function is
 	 called, so we need to report it explicitly.  Use iteration in
@@ -501,10 +503,14 @@ mi_about_to_proceed (void)
   mi_proceeded = 1;
 }
 
-/* When non-zero, no MI notifications will be emitted in
-   response to breakpoint change observers.  */
+/* When the element is non-zero, no MI notifications will be emitted in
+   response to the corresponding observers.  */
 
-int mi_suppress_breakpoint_notifications = 0;
+struct mi_suppress_notification mi_suppress_notification =
+  {
+    0,
+    0,
+  };
 
 /* Emit notification about a created breakpoint.  */
 
@@ -515,7 +521,7 @@ mi_breakpoint_created (struct breakpoint *b)
   struct ui_out *mi_uiout = interp_ui_out (top_level_interpreter ());
   volatile struct gdb_exception e;
 
-  if (mi_suppress_breakpoint_notifications)
+  if (mi_suppress_notification.breakpoint)
     return;
 
   if (b->number <= 0)
@@ -546,7 +552,7 @@ mi_breakpoint_deleted (struct breakpoint *b)
 {
   struct mi_interp *mi = top_level_interpreter_data ();
 
-  if (mi_suppress_breakpoint_notifications)
+  if (mi_suppress_notification.breakpoint)
     return;
 
   if (b->number <= 0)
@@ -569,7 +575,7 @@ mi_breakpoint_modified (struct breakpoint *b)
   struct ui_out *mi_uiout = interp_ui_out (top_level_interpreter ());
   volatile struct gdb_exception e;
 
-  if (mi_suppress_breakpoint_notifications)
+  if (mi_suppress_notification.breakpoint)
     return;
 
   if (b->number <= 0)
@@ -730,6 +736,32 @@ mi_solib_unloaded (struct so_list *solib)
   gdb_flush (mi->event_channel);
 }
 
+/* Emit notification about the command parameter change.  */
+
+static void
+mi_command_param_changed (const char *param, const char *value)
+{
+  struct mi_interp *mi = top_level_interpreter_data ();
+  struct ui_out *mi_uiout = interp_ui_out (top_level_interpreter ());
+
+  if (mi_suppress_notification.cmd_param_changed)
+    return;
+
+  target_terminal_ours ();
+
+  fprintf_unfiltered (mi->event_channel,
+		      "cmd-param-changed");
+
+  ui_out_redirect (mi_uiout, mi->event_channel);
+
+  ui_out_field_string (mi_uiout, "param", param);
+  ui_out_field_string (mi_uiout, "value", value);
+
+  ui_out_redirect (mi_uiout, NULL);
+
+  gdb_flush (mi->event_channel);
+}
+
 static int
 report_initial_inferior (struct inferior *inf, void *closure)
 {
diff --git a/gdb/mi/mi-main.c b/gdb/mi/mi-main.c
index dfb4892..4db3652 100644
--- a/gdb/mi/mi-main.c
+++ b/gdb/mi/mi-main.c
@@ -2099,8 +2099,15 @@ mi_cmd_execute (struct mi_parse *parse)
 
   if (strncmp (parse->command, "break-", sizeof ("break-") - 1 ) == 0)
     {
-      make_cleanup_restore_integer (&mi_suppress_breakpoint_notifications);
-      mi_suppress_breakpoint_notifications = 1;
+      make_cleanup_restore_integer (&mi_suppress_notification.breakpoint);
+      mi_suppress_notification.breakpoint = 1;
+    }
+  else if (strncmp (parse->command, "gdb-set", sizeof ("gdb-set") - 1) == 0)
+    {
+      int *p = &mi_suppress_notification.cmd_param_changed;
+
+      make_cleanup_restore_integer (p);
+      mi_suppress_notification.cmd_param_changed = 1;
     }
 
   if (parse->cmd->argv_func != NULL)
diff --git a/gdb/mi/mi-main.h b/gdb/mi/mi-main.h
index beac2cd..f4268c2 100644
--- a/gdb/mi/mi-main.h
+++ b/gdb/mi/mi-main.h
@@ -32,7 +32,15 @@ extern char *current_token;
 
 extern int running_result_record_printed;
 extern int mi_proceeded;
-extern int mi_suppress_breakpoint_notifications;
+
+struct mi_suppress_notification
+{
+  /* Breakpoint notification suppressed?  */
+  int breakpoint;
+  /* Command param changed notification suppressed?  */
+  int cmd_param_changed;
+};
+extern struct mi_suppress_notification mi_suppress_notification;
 
 #endif