[Bug gdb/30104] New: Add "help variable", like "help function" but for convenience variables instead of functions

[Bug gdb/30104] New: Add "help variable", like "help function" but for convenience variables instead of functions

[pedro at palves dot net]

https://sourceware.org/bugzilla/show_bug.cgi?id=30104

            Bug ID: 30104
           Summary: Add "help variable", like "help function" but for
                    convenience variables instead of functions
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: pedro at palves dot net
  Target Milestone: ---

We have:

 (gdb) help function 
 Placeholder command for showing help on convenience functions.

 List of function subcommands:

 function _any_caller_is -- Check all calling function's names.
 function _any_caller_matches -- Compare all calling function's names with a 
 regexp.
 function _as_string -- Return the string representation of a value.
 function _caller_is -- Check the calling function's name.
 function _caller_matches -- Compare the calling function's name with a regexp.
 ...
 Type "help function" followed by function subcommand name for full 
 documentation.
 ...
 (gdb)

But, we don't have any way to get help about internal convenience variables. 
There's "show convenience", but that's about seeing the variable's values.

IWBN if we added a "help variable" placeholder command, that would work just
like "help function", but it would list variables.  Here's a mockup:

 (gdb) help variable
 Placeholder command for showing help on convenience variables.

 List of variable subcommands:

 variable _gdb_minor -- blah blah
 variable _gdb_major -- blah blah
 $_inferior -- blah blah
 ...
 Type "help variable" followed by variable subcommand name for full 
 documentation.
 ...
 (gdb)

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