Move gdbsupport to the top level

[Tom Tromey]

>>>>> "Eli" == Eli Zaretskii <eliz@gnu.org> writes:

>> From: Tom Tromey <tom@tromey.com>
>> Cc: Pedro Alves <palves@redhat.com>,  gdb-patches@sourceware.org
>> Date: Tue, 17 Sep 2019 10:11:39 -0600
>> 
>> We discussed this at Cauldron and agreed to try this approach.

Eli> Is it possible to still discuss this?  Or is the decision at Cauldron
Eli> final and cannot be appealed?

Nothing is final.

>> That is, the plan is to remove the readline sources from the tree,
>> and remove --with-system-readline, but follow the approach of some
>> other libraries where one can unpack readline into the source tree
>> and top-level configure will arrange to build it.

Eli> Would it be possible for whoever tars the release to drop the readline
Eli> into the tree and build it under some opt-in configure-time switch?
Eli> Making this opt-in might solve at least some of the problems that led
Eli> to the decision, I think/hope.

Seems like a good suggestion to me.

Tom