constify exec_file_attach

This constifies exec_file_attach and updates the rest of gdb.

Insight will need some minor tweaks after this, though it's worth
noting that I think all that hook stuff can actually just go away.  I
sent a patch to this effect once, but since the Insight source
repository situation isn't currently resolved there wasn't a
convenient way to test it.

2014-07-30  Tom Tromey  <tromey@redhat.com>

	* corefile.c (hook_type, call_extra_exec_file_hooks)
	(specify_exec_file_hook): Constify.
	* exec.c (exec_file_attach): Make "filename" const.
	* gdbcore.h (deprecated_exec_file_display_hook)
	(specify_exec_file_hook, exec_file_attach): Constify.
	* main.c (captured_main): Use catch_command_errors_const.

gdb/ChangeLog

@@ -1,3 +1,12 @@
+2014-07-30  Tom Tromey  <tromey@redhat.com>
+
+	* corefile.c (hook_type, call_extra_exec_file_hooks)
+	(specify_exec_file_hook): Constify.
+	* exec.c (exec_file_attach): Make "filename" const.
+	* gdbcore.h (deprecated_exec_file_display_hook)
+	(specify_exec_file_hook, exec_file_attach): Constify.
+	* main.c (captured_main): Use catch_command_errors_const.
+
 2014-07-30  Tom Tromey  <tromey@redhat.com>
 
 	* target.c (open_target): New function.

gdb/corefile.c

@@ -39,7 +39,6 @@
 /* Local function declarations.  */
 
 extern void _initialize_core (void);
-static void call_extra_exec_file_hooks (char *filename);
 
 /* You can have any number of hooks for `exec_file_command' command to
    call.  If there's only one hook, it is set in exec_file_display
@@ -50,7 +49,7 @@ static void call_extra_exec_file_hooks (char *filename);
    only one hook could be set, and which called
    deprecated_exec_file_display_hook directly.  */
 
-typedef void (*hook_type) (char *);
+typedef void (*hook_type) (const char *);
 
 hook_type deprecated_exec_file_display_hook;	/* The original hook.  */
 static hook_type *exec_file_extra_hooks;	/* Array of additional
@@ -87,7 +86,7 @@ core_file_command (char *filename, int from_tty)
    functions.  */
 
 static void
-call_extra_exec_file_hooks (char *filename)
+call_extra_exec_file_hooks (const char *filename)
 {
   int i;
 
@@ -99,7 +98,7 @@ call_extra_exec_file_hooks (char *filename)
    This is called from the x-window display code.  */
 
 void
-specify_exec_file_hook (void (*hook) (char *))
+specify_exec_file_hook (void (*hook) (const char *))
 {
   hook_type *new_array;
 

gdb/exec.c

@@ -154,7 +154,7 @@ exec_file_clear (int from_tty)
    we're supplying the exec pathname late for good reason.)  */
 
 void
-exec_file_attach (char *filename, int from_tty)
+exec_file_attach (const char *filename, int from_tty)
 {
   struct cleanup *cleanups;
 

gdb/gdbcore.h

@@ -127,14 +127,14 @@ extern void write_memory_signed_integer (CORE_ADDR addr, int len,
 
 /* Hook for `exec_file_command' command to call.  */
 
-extern void (*deprecated_exec_file_display_hook) (char *filename);
+extern void (*deprecated_exec_file_display_hook) (const char *filename);
 
 /* Hook for "file_command", which is more useful than above
    (because it is invoked AFTER symbols are read, not before).  */
 
 extern void (*deprecated_file_changed_hook) (char *filename);
 
-extern void specify_exec_file_hook (void (*hook) (char *filename));
+extern void specify_exec_file_hook (void (*hook) (const char *filename));
 
 /* Binary File Diddler for the core file.  */
 
@@ -148,7 +148,7 @@ extern int write_files;
 
 extern void core_file_command (char *filename, int from_tty);
 
-extern void exec_file_attach (char *filename, int from_tty);
+extern void exec_file_attach (const char *filename, int from_tty);
 
 extern void exec_file_clear (int from_tty);
 

gdb/main.c

@@ -1068,16 +1068,16 @@ captured_main (void *data)
       /* The exec file and the symbol-file are the same.  If we can't
          open it, better only print one error message.
          catch_command_errors returns non-zero on success!  */
-      if (catch_command_errors (exec_file_attach, execarg,
+      if (catch_command_errors_const (exec_file_attach, execarg,
-				!batch_flag, RETURN_MASK_ALL))
+				      !batch_flag, RETURN_MASK_ALL))
 	catch_command_errors_const (symbol_file_add_main, symarg,
 				    !batch_flag, RETURN_MASK_ALL);
     }
   else
     {
       if (execarg != NULL)
-	catch_command_errors (exec_file_attach, execarg,
+	catch_command_errors_const (exec_file_attach, execarg,
-			      !batch_flag, RETURN_MASK_ALL);
+				    !batch_flag, RETURN_MASK_ALL);
       if (symarg != NULL)
 	catch_command_errors_const (symbol_file_add_main, symarg,
 				    !batch_flag, RETURN_MASK_ALL);