[RFAv2 01/10] Fix the only incorrect case found by command_structure_invariants selftest.

[Philippe Waroquiers]

The next commit introduces a selftest that detects when the GDB
command structure does not define a tree when using the pointers
'next/*prefixlist'.  This test detects one such case, fixed
by this commit.

The command 'info set' was defined as a specific prefix command,
but re-using the command list already used for the 'show' command.
This leads to the command tree 'next/*prefixlist' to not be a tree.

This change defines 'info set ' as an alias, thereby fixing the selftest.

YYYY-MM-DD  Philippe Waroquiers  <philippe.waroquiers@skynet.be>

	* cli/cli-cmds.c (_initialize_cli_cmds): Define 'info set' as
	an alias of 'show'.
---
 gdb/cli/cli-cmds.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/gdb/cli/cli-cmds.c b/gdb/cli/cli-cmds.c
index 58e9cf3195..c17521b1f6 100644
--- a/gdb/cli/cli-cmds.c
+++ b/gdb/cli/cli-cmds.c
@@ -2209,12 +2209,11 @@ Generic command for showing things about the program being debugged."),
   add_com ("complete", class_obscure, complete_command,
 	   _("List the completions for the rest of the line as a command."));
 
-  add_show_prefix_cmd ("show", class_info, _("\
+  c = add_show_prefix_cmd ("show", class_info, _("\
 Generic command for showing things about the debugger."),
-		       &showlist, "show ", 0, &cmdlist);
+			   &showlist, "show ", 0, &cmdlist);
   /* Another way to get at the same thing.  */
-  add_show_prefix_cmd ("set", class_info, _("Show all GDB settings."),
-		       &showlist, "info set ", 0, &infolist);
+  add_alias_cmd ("set", c, class_info, 0, &infolist);
 
   c = add_com ("with", class_vars, with_command, _("\
 Temporarily set SETTING to VALUE, run COMMAND, and restore SETTING.\n\
-- 
2.20.1