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, 84 deletions

diff --git a/readline/doc/rlman.texi b/readline/doc/rlman.texi
deleted file mode 100644
index 737f971..0000000
--- a/readline/doc/rlman.texi
+++ /dev/null
@@ -1,84 +0,0 @@
-\input texinfo    @c -*-texinfo-*-
-@comment %**start of header (This is for running Texinfo on a region.)
-@setfilename readline.info
-@settitle GNU Readline Library
-@include version.texi
-
-@comment %**end of header (This is for running Texinfo on a region.)
-@synindex vr fn
-
-@copying
-This manual describes the GNU Readline Library
-(version @value{VERSION}, @value{UPDATED}), a library which aids in the
-consistency of user interface across discrete programs which provide
-a command line interface.
-
-Copyright @copyright{} 1988--2016 Free Software Foundation, Inc.
-
-@quotation
-Permission is granted to copy, distribute and/or modify this document
-under the terms of the GNU Free Documentation License, Version 1.3 or
-any later version published by the Free Software Foundation; with no
-Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
-A copy of the license is included in the section entitled
-``GNU Free Documentation License''.
-
-@end quotation
-@end copying
-
-@dircategory Libraries
-@direntry
-* Readline: (readline).       The GNU readline library API.
-@end direntry
-
-@titlepage  
-@title GNU Readline Library
-@subtitle Edition @value{EDITION}, for @code{Readline Library} Version @value{VERSION}.
-@subtitle @value{UPDATED-MONTH}
-@author Chet Ramey, Case Western Reserve University
-@author Brian Fox, Free Software Foundation
-
-@page
-@vskip 0pt plus 1filll
-@insertcopying
-
-@end titlepage
-
-@contents
-
-@ifnottex
-@node Top
-@top GNU Readline Library
-
-This document describes the GNU Readline Library, a utility which aids
-in the consistency of user interface across discrete programs which
-provide a command line interface.
-The Readline home page is @url{http://www.gnu.org/software/readline/}.
-
-@menu
-* Command Line Editing::	   GNU Readline User's Manual.
-* Programming with GNU Readline::  GNU Readline Programmer's Manual.
-* GNU Free Documentation License::	License for copying this manual.
-* Concept Index::		   Index of concepts described in this manual.
-* Function and Variable Index::	   Index of externally visible functions
-				   and variables.
-@end menu
-@end ifnottex
-
-@include rluser.texi
-@include rltech.texi
-
-@node GNU Free Documentation License
-@appendix GNU Free Documentation License
-
-@include fdl.texi
-
-@node Concept Index
-@unnumbered Concept Index
-@printindex cp
-
-@node Function and Variable Index
-@unnumbered Function and Variable Index
-@printindex fn
-
-@bye