gdb: add add_setshow_prefix_cmd

There's a common pattern to call add_basic_prefix_cmd and
add_show_prefix_cmd to add matching set and show commands.  Add the
add_setshow_prefix_cmd function to factor that out and use it at a few
places.

Change-Id: I6e9e90a30e9efb7b255bf839cac27b85d7069cfd

1 files changed, 11 insertions, 11 deletions

diff --git a/gdb/guile/guile.c b/gdb/guile/guile.c
index 8ba840cba6a..30cfa296fc5 100644
--- a/gdb/guile/guile.c
+++ b/gdb/guile/guile.c
@@ -780,17 +780,17 @@ This command is only a placeholder.")
 	   );
   add_com_alias ("gu", guile_cmd_element, class_obscure, 1);
 
-  cmd_list_element *set_guile_cmd
-    = add_basic_prefix_cmd ("guile", class_obscure,
-			    _("Prefix command for Guile preference settings."),
-			    &set_guile_list, 0, &setlist);
-  add_alias_cmd ("gu", set_guile_cmd, class_obscure, 1, &setlist);
-
-  cmd_list_element *show_guile_cmd
-    = add_show_prefix_cmd ("guile", class_obscure,
-			   _("Prefix command for Guile preference settings."),
-			   &show_guile_list, 0, &showlist);
-  add_alias_cmd ("gu", show_guile_cmd, class_obscure, 1, &showlist);
+  set_show_commands setshow_guile_cmds
+    = add_setshow_prefix_cmd ("guile", class_obscure,
+			      _("\
+Prefix command for Guile preference settings."),
+			      _("\
+Prefix command for Guile preference settings."),
+			      &set_guile_list, &show_guile_list,
+			      &setlist, &showlist);
+
+  add_alias_cmd ("gu", setshow_guile_cmds.set, class_obscure, 1, &setlist);
+  add_alias_cmd ("gu", setshow_guile_cmds.show, class_obscure, 1, &showlist);
 
   cmd_list_element *info_guile_cmd
     = add_basic_prefix_cmd ("guile", class_obscure,