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, 66 insertions, 0 deletions

diff --git a/gnulib/configure.ac b/gnulib/configure.ac
new file mode 100644
index 00000000000..74e4ae2b688
--- /dev/null
+++ b/gnulib/configure.ac
@@ -0,0 +1,66 @@
+dnl Autoconf configure script for GDB, the GNU debugger.
+dnl Copyright (C) 1995-2019 Free Software Foundation, Inc.
+dnl
+dnl This file is part of GDB.
+dnl
+dnl This program is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 3 of the License, or
+dnl (at your option) any later version.
+dnl
+dnl This program is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+dnl GNU General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU General Public License
+dnl along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+dnl Process this file with autoconf to produce a configure script.
+
+AC_INIT([libgnu], [UNUSED-VERSION])
+AC_CONFIG_SRCDIR([import/memmem.c])
+AC_CONFIG_HEADER(config.h:config.in)
+AM_MAINTAINER_MODE
+
+AC_PROG_CC
+AC_USE_SYSTEM_EXTENSIONS
+gl_EARLY
+AM_PROG_CC_STDC
+
+ACX_LARGEFILE
+
+AC_CONFIG_AUX_DIR(..)
+AC_CANONICAL_SYSTEM
+
+gl_INIT
+
+# We don't use automake, but gnulib does.  This line lets us generate
+# its Makefile.in.
+AM_INIT_AUTOMAKE([no-define])
+
+AM_SILENT_RULES([yes])
+
+# --------------------- #
+# Checks for programs.  #
+# --------------------- #
+
+AC_PROG_INSTALL
+AC_PROG_LN_S
+AC_PROG_RANLIB
+
+AC_CHECK_TOOL(AR, ar)
+
+# ---------------------- #
+# Checks for libraries.  #
+# ---------------------- #
+
+AC_OUTPUT(Makefile import/Makefile,
+[
+case x$CONFIG_HEADERS in
+xconfig.h:config.in)
+echo > stamp-h ;;
+esac
+])
+
+exit 0