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Tom Tromey 6999161a2a 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 a8a5dbcab8.

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
 		2019-10-23 15:16:48 -06:00
..
readline Move readline to the readline/readline subdirectory 2019-10-23 15:16:48 -06:00
.gitignore Move readline to the readline/readline subdirectory 2019-10-23 15:16:48 -06:00
ChangeLog Move readline to the readline/readline subdirectory 2019-10-23 15:16:48 -06:00
Makefile.am Move readline to the readline/readline subdirectory 2019-10-23 15:16:48 -06:00
Makefile.in Move readline to the readline/readline subdirectory 2019-10-23 15:16:48 -06:00
README Move readline to the readline/readline subdirectory 2019-10-23 15:16:48 -06:00
aclocal.m4 Move readline to the readline/readline subdirectory 2019-10-23 15:16:48 -06:00
configure Move readline to the readline/readline subdirectory 2019-10-23 15:16:48 -06:00
configure.ac Move readline to the readline/readline subdirectory 2019-10-23 15:16:48 -06:00

README 

This is an import of readline that is used by gdb.

To send patches, follow the gdb patch submission instructions in
../gdb/CONTRIBUTE.  For maintainers, see ../gdb/MAINTAINERS.

If you need to patch readline, please document the changes here.

To import, copy the upstream readline sources into the "readline"
subdirectory, remembering to (1) remove any files that were deleted
upstream, and (2) merge the one small configure.ac patch that gdb
carries.

If your import removes the need for a local patch, please remember to
update this file.