gdb: make frame_debug a boolean

gdb/ChangeLog:

	* frame.h (frame_debug): Change type to bool.
	* frame.c (frame_debug): Change type to bool.
	(_initialize_frame): Adjust.

Change-Id: I27b5359a25ad53ac42618b5708a025c348a1eeda

gdb/ChangeLog

@@ -1,3 +1,9 @@
+2021-06-29  Simon Marchi  <simon.marchi@polymtl.ca>
+
+	* frame.h (frame_debug): Change type to bool.
+	* frame.c (frame_debug): Change type to bool.
+	(_initialize_frame): Adjust.
+
 2021-06-29  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>
 
 	* gdbthread.h (find_thread_ptid): Remove the duplicate declaration.

gdb/frame.c

@@ -330,7 +330,8 @@ scoped_restore_selected_frame::~scoped_restore_selected_frame ()
 
 /* Flag to control debugging.  */
 
-unsigned int frame_debug;
+bool frame_debug;
+
 static void
 show_frame_debug (struct ui_file *file, int from_tty,
 		  struct cmd_list_element *c, const char *value)
@@ -3195,11 +3196,11 @@ Literal \"unlimited\" or zero means no limit."),
      set_backtrace_option_defs, &set_backtrace_cmdlist, &show_backtrace_cmdlist);
 
   /* Debug this files internals.  */
-  add_setshow_zuinteger_cmd ("frame", class_maintenance, &frame_debug,  _("\
+  add_setshow_boolean_cmd ("frame", class_maintenance, &frame_debug,  _("\
 Set frame debugging."), _("\
 Show frame debugging."), _("\
 When non-zero, frame specific internal debugging is enabled."),
-			     NULL,
-			     show_frame_debug,
-			     &setdebuglist, &showdebuglist);
+			   NULL,
+			   show_frame_debug,
+			   &setdebuglist, &showdebuglist);
 }

gdb/frame.h

@@ -214,7 +214,7 @@ extern const struct frame_id outer_frame_id;
 
 /* Flag to control debugging.  */
 
-extern unsigned int frame_debug;
+extern bool frame_debug;
 
 /* Construct a frame ID.  The first parameter is the frame's constant
    stack address (typically the outer-bound), and the second the