Move gnulib to top level

This patch moves the gdb/gnulib subdirectory to the top level.

It adjusts the top-level build system to build gnulib when necessary,
and changes gdb to use this.  However, gdbserver still builds its own
copy of gnulib, just from the new source location.

A small hack was needed to ensure that gnulib is only built when gdb
is enabled.  The Makefile only provides an ordering -- the directory
must be mentioned in configdirs to actually be compiled at all.

Most of the patch is just a "git mv" of gnulib, though a few minor
path adjustments were needed in some files there.

Tested by the buildbot.

ChangeLog
2019-06-14  Tom Tromey  <tom@tromey.com>

	* MAINTAINERS: Add gnulib.
	* gnulib: New directory, move from gdb/gnulib.
	* configure.ac (host_libs): Add gnulib.
	* configure: Rebuild.
	* Makefile.def (host_modules, dependencies): Add gnulib.
	* Makefile.in: Rebuild.

gdb/ChangeLog
2019-06-14  Tom Tromey  <tom@tromey.com>

	* gnulib: Move directory to top-level.
	* configure.ac: Don't configure gnulib.
	* configure: Rebuild.
	* common/common-defs.h: Use new path to gnulib.
	* Makefile.in (GNULIB_BUILDDIR): Now ../gnulib.
	(GNULIB_H): Remove.
	(INCGNU): Look in new gnulib location.
	(HFILES_NO_SRCDIR): Remove gnulib files.
	(SUBDIR, REQUIRED_SUBDIRS): Remove gnulib.
	(generated_files): Remove GNULIB_H.
	($(LIBGNU), all-lib): Remove targets.
	(distclean): Don't mention GNULIB_BUILDDIR.
	($(GNULIB_BUILDDIR)/Makefile): Remove target.

gdb/gdbserver/ChangeLog
2019-06-14  Tom Tromey  <tom@tromey.com>

	* configure.ac: Use new path to gnulib.
	* configure: Rebuild.
	* Makefile.in (INCGNU, $(GNULIB_BUILDDIR)/Makefile): Use new path
	to gnulib.

gnulib/ChangeLog
2019-06-14  Tom Tromey  <tom@tromey.com>

	* update-gnulib.sh: Adjust paths.
	* Makefile.in: Adjust paths.
	* configure.ac: Adjust paths.  Use ACX_LARGEFILE.
	* configure: Rebuild.

1 files changed, 0 insertions, 86 deletions

diff --git a/gdb/gnulib/import/dirname-lgpl.c b/gdb/gnulib/import/dirname-lgpl.c
deleted file mode 100644
index a7aabf9..0000000
--- a/gdb/gnulib/import/dirname-lgpl.c
+++ /dev/null
@@ -1,86 +0,0 @@
-/* dirname.c -- return all but the last element in a file name
-
-   Copyright (C) 1990, 1998, 2000-2001, 2003-2006, 2009-2016 Free Software
-   Foundation, Inc.
-
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-#include <config.h>
-
-#include "dirname.h"
-
-#include <stdlib.h>
-#include <string.h>
-
-/* Return the length of the prefix of FILE that will be used by
-   dir_name.  If FILE is in the working directory, this returns zero
-   even though 'dir_name (FILE)' will return ".".  Works properly even
-   if there are trailing slashes (by effectively ignoring them).  */
-
-size_t
-dir_len (char const *file)
-{
-  size_t prefix_length = FILE_SYSTEM_PREFIX_LEN (file);
-  size_t length;
-
-  /* Advance prefix_length beyond important leading slashes.  */
-  prefix_length += (prefix_length != 0
-                    ? (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
-                       && ISSLASH (file[prefix_length]))
-                    : (ISSLASH (file[0])
-                       ? ((DOUBLE_SLASH_IS_DISTINCT_ROOT
-                           && ISSLASH (file[1]) && ! ISSLASH (file[2])
-                           ? 2 : 1))
-                       : 0));
-
-  /* Strip the basename and any redundant slashes before it.  */
-  for (length = last_component (file) - file;
-       prefix_length < length; length--)
-    if (! ISSLASH (file[length - 1]))
-      break;
-  return length;
-}
-
-
-/* In general, we can't use the builtin 'dirname' function if available,
-   since it has different meanings in different environments.
-   In some environments the builtin 'dirname' modifies its argument.
-
-   Return the leading directories part of FILE, allocated with malloc.
-   Works properly even if there are trailing slashes (by effectively
-   ignoring them).  Return NULL on failure.
-
-   If lstat (FILE) would succeed, then { chdir (dir_name (FILE));
-   lstat (base_name (FILE)); } will access the same file.  Likewise,
-   if the sequence { chdir (dir_name (FILE));
-   rename (base_name (FILE), "foo"); } succeeds, you have renamed FILE
-   to "foo" in the same directory FILE was in.  */
-
-char *
-mdir_name (char const *file)
-{
-  size_t length = dir_len (file);
-  bool append_dot = (length == 0
-                     || (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
-                         && length == FILE_SYSTEM_PREFIX_LEN (file)
-                         && file[2] != '\0' && ! ISSLASH (file[2])));
-  char *dir = malloc (length + append_dot + 1);
-  if (!dir)
-    return NULL;
-  memcpy (dir, file, length);
-  if (append_dot)
-    dir[length++] = '.';
-  dir[length] = '\0';
-  return dir;
-}