Move readline to the readline/readline subdirectory

readline turns out to be a bit of a stumbling block for the project to
move gdbsupport (and then gdbserver) to the top-level.

The issue is that readline headers are intended to be included with
names like "readline/readline.h".  To support this, gdb effectively
adds a -I option pointing to the top-level source directory -- but,
importantly, this option is not used when the system readline is used.

For gdbsupport, a -I option like this would always be needed, but that
in turn would break the system readline case.  This was PR build/17077,
fixed in commit a8a5dbcab8df0b3a9e04745d4fe8d64740acb323.

Previously, we had discussed this on the gdb-patches list in terms of
removing readline from the tree

    https://sourceware.org/ml/gdb-patches/2019-09/msg00317.html

However, Eli expressed some concerns, and Joel did as well (off-list).

Given those concerns, and the fact that a patch-free local readline is
relatively new in gdb (it was locally patched for years), I changed my
mind and decided to handle this situation by moving the readline
sources down a level.

That is, upstream readline is now in readline/readline, and the
top-level readline directory just contains the minimal configury
needed to build that.

This fixes the problem because, when gdb unconditionally adds a
-I$(top_srcdir), this will not find readline headers.  A separate -I
will be needed instead, which is exactly what's needed for
--with-system-readline.

gdb/ChangeLog
2019-10-23  Tom Tromey  <tom@tromey.com>

	* Makefile.in (READLINE_DIR): Update.

gdb/doc/ChangeLog
2019-10-23  Tom Tromey  <tom@tromey.com>

	* Makefile.in (READLINE_DIR): Update.

readline/ChangeLog
2019-10-23  Tom Tromey  <tom@tromey.com>

	Move old contents to readline/ subdirectory.
	* aclocal.m4, configure, configure.ac, .gitignore, Makefile.am,
	Makefile.in, README: New files.

Change-Id: Ice156a2ee09ea68722b48f64d97146d7428ea9e4

1 files changed, 0 insertions, 94 deletions

diff --git a/readline/doc/ChangeLog.gdb b/readline/doc/ChangeLog.gdb
deleted file mode 100644
index 5830e1b..0000000
--- a/readline/doc/ChangeLog.gdb
+++ /dev/null
@@ -1,94 +0,0 @@
-2011-05-11  Jan Kratochvil  <jan.kratochvil@redhat.com>
-
-	* hsuser.texi (Using History Interactively): Disable !BashFeatures
-	@defcodeindex.  Make the `Programming with GNU History' reference
-	external.
-	* inc-hist.texinfo: Remove.
-
-2011-05-11  Jan Kratochvil  <jan.kratochvil@redhat.com>
-
-	Imported readline 6.2, and upstream patch 001.
-
-2006-04-24  Daniel Jacobowitz  <dan@codesourcery.com>
-
-	Imported readline 5.1, and upstream patches 001-004.
-
-2003-09-14  Andrew Cagney  <cagney@redhat.com>
-
-	* history.0: Delete generated file.
-
-2002-02-24  Elena Zannoni  <ezannoni@redhat.com>
-
-        * ChangeLog.gdb: Renamed from ChangeLog.
-
-2002-01-20  Eli Zaretskii  <eliz@is.elta.co.il>
-
-	* rluser.texinfo (Sample Init File): Prevent overfull hboxes.
-	From Brian Youmans <3diff@gnu.org>.
-
-2000-07-09  Elena Zannoni  <ezannoni@kwikemart.cygnus.com>
-
-        * Removed generated files rluserman.{dvi, info, html, ps}.
-
-2000-07-07  Elena Zannoni  <ezannoni@kwikemart.cygnus.com>
-
-        * Import of readline 4.1.
-
-        Regenerated inc-hist.texinfo as copy of hsuser.texinfo, for
-        inclusion in the gdb manual.
-
-        New file: rluserman.texinfo
-
-Tue Apr 18 15:43:52 2000  Andrew Cagney  <cagney@b1.cygnus.com>
-
-	* readline.0: Delete.  Generated by Makefile, deleted by distclean
- 	rule.
-
-Tue Mar 28 16:06:22 2000  Andrew Cagney  <cagney@b1.cygnus.com>
-
-	* inc-hist.texinfo, rluser.texinfo: Revert change Fri Mar 24
- 	18:04:32 2000 Andrew Cagney <cagney@b1.cygnus.com>.
-  	Unconditionally provide @chapter and @node.
-
-Fri Mar 24 18:04:32 2000  Andrew Cagney  <cagney@b1.cygnus.com>
-
-	* inc-hist.texinfo: When GDBN omit the chapter/node.
-	* rluser.texinfo (Command Line Editing): Ditto.
-
-1999-08-10  Elena Zannoni  <ezannoni@kwikemart.cygnus.com>
-
-	* hsuser.texinfo (Bash History Builtins): Comment out btindex
-	commands.
-
-	* inc-hist.texinfo: New file. Same as hsuser.texinfo, but w/o
- 	cross reference to GNU History Manual.
-	
-Tue Dec 22 10:07:58 1998  Elena Zannoni  <ezannoni@kwikemart.cygnus.com>
-
-	* hsuser.texinfo (Bash History Builtins): comment out btindex
-	commands.
-
-	* Import of Readline 2.2.1.
-	
-	New files: readline.0, readline.3, texi2dvi, texi2html.
-
-1998-12-17  Felix Lee  <flee@cygnus.com>
-
-	* inc-hist.texi: @node line "Using History" was wrong.
-
-Thu Jul  9 17:03:26 1998  Edith Epstein  <eepstein@sophia.cygnus.com>
-
-	* inc-hist.texi: one line change.
-
-Wed Sep 20 12:57:29 1995  Ian Lance Taylor  <ian@cygnus.com>
-
-	* Makefile.in (maintainer-clean): New synonym for realclean.
-
-Tue Feb  2 11:40:04 1993  Roland H. Pesch  (pesch@fowanton.cygnus.com)
-
-	* Makefile.in: configurable (and useable) Makefile template
-        * Makefile: removed, replaced with configurable Makefile.in
-        * texindex.c texinfo.tex: remove, replacing w/refs to tools
-	elsewhere in distribution tree
-        * configure.in: pro forma configure stub
-	* ChangeLog: new file