[RFC PATCH] gdb: add command to clear value history

[Rustam Kovhaev <rkovhaev@gmail.com>]

Hello,

While debugging an application I wanted to clear the value history and I
could not find an option to do it. 
I might be the only one who gets lost in the value history and I am not
sure if anyone else needs it, but I thought it would be nice to have it.
And I hope this does not break anything.
Please let me know what you think. Thanks!

Let's have the functionality to clear the value history.
Introduce 'set values clear' command to clear the value history.

Signed-off-by: Rustam Kovhaev <rkovhaev@gmail.com>
---
 gdb/value.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/gdb/value.c b/gdb/value.c
index 605e52dee82..726b5ef9084 100644
--- a/gdb/value.c
+++ b/gdb/value.c
@@ -1971,6 +1971,15 @@ show_values (const char *num_exp, int from_tty)
   if (from_tty && num_exp)
     set_repeat_arguments ("+");
 }
+
+static struct cmd_list_element *setvallist;
+
+static void
+clear_values (const char *ignore, int from_tty)
+{
+    value_history.clear ();
+}
+
 \f
 enum internalvar_kind
 {
@@ -4343,6 +4352,13 @@ Convenience functions are defined via the Python API."
 Elements of value history around item number IDX (or last ten)."),
 	   &showlist);
 
+  add_cmd("clear", no_class, clear_values, _("\
+Clear value history."), &setvallist);
+
+  add_basic_prefix_cmd ("values", class_support, _("\
+Generic command for setting value history parameters"),
+		  &setvallist, 0, &setlist);
+
   add_com ("init-if-undefined", class_vars, init_if_undefined_command, _("\
 Initialize a convenience variable if necessary.\n\
 init-if-undefined VARIABLE = EXPRESSION\n\
-- 
2.37.3