gdbsupport, gdb: change observer_debug to bool

gdb/ChangeLog:

	* observable.c (observer_debug): Change to bool.

gdbsupport/ChangeLog:

	* observable.h (observer_debug): Change to bool.

Change-Id: I58634235a20740a66eacb1c83bae3cf3304ae1fd

gdb/ChangeLog

@@ -1,3 +1,7 @@
+2021-04-23  Simon Marchi  <simon.marchi@polymtl.ca>
+
+	* observable.c (observer_debug): Change to bool.
+
 2021-04-23  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	* dwarf2/read.c: Add 'unordered_set' include.

gdb/observable.c

@@ -28,7 +28,7 @@ namespace gdb
 namespace observers
 {
 
-unsigned int observer_debug;
+bool observer_debug = false;
 
 #define DEFINE_OBSERVABLE(name) decltype (name) name (# name)
 
@@ -92,12 +92,12 @@ void _initialize_observer ();
 void
 _initialize_observer ()
 {
-  add_setshow_zuinteger_cmd ("observer", class_maintenance,
-			     &gdb::observers::observer_debug, _("\
+  add_setshow_boolean_cmd ("observer", class_maintenance,
+			   &gdb::observers::observer_debug, _("\
 Set observer debugging."), _("\
 Show observer debugging."), _("\
 When non-zero, observer debugging is enabled."),
-			     NULL,
-			     show_observer_debug,
-			     &setdebuglist, &showdebuglist);
+			   NULL,
+			   show_observer_debug,
+			   &setdebuglist, &showdebuglist);
 }

gdbsupport/ChangeLog

@@ -1,3 +1,7 @@
+2021-04-23  Simon Marchi  <simon.marchi@polymtl.ca>
+
+	* observable.h (observer_debug): Change to bool.
+
 2021-04-23  Simon Marchi  <simon.marchi@polymtl.ca>
 
 	* common-debug.h: Include preprocessor.h.

gdbsupport/observable.h

@@ -30,7 +30,7 @@ namespace gdb
 namespace observers
 {
 
-extern unsigned int observer_debug;
+extern bool observer_debug;
 
 /* An observer is an entity which is interested in being notified
    when GDB reaches certain states, or certain events occur in GDB.