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.

4 files changed, 11 insertions, 4 deletions

diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index 460daab..a67a9a2 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,3 +1,10 @@
+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.
+
 2019-06-11  Tom Tromey  <tom@tromey.com>
 
 	* Makefile.in (SFILES): Add alloc.c.
diff --git a/gdb/gdbserver/Makefile.in b/gdb/gdbserver/Makefile.in
index 792325b..b9df2be 100644
--- a/gdb/gdbserver/Makefile.in
+++ b/gdb/gdbserver/Makefile.in
@@ -103,7 +103,7 @@ ustinc = @ustinc@
 # gnulib
 GNULIB_BUILDDIR = build-gnulib-gdbserver
 LIBGNU = $(GNULIB_BUILDDIR)/import/libgnu.a
-INCGNU = -I$(srcdir)/../gnulib/import -I$(GNULIB_BUILDDIR)/import
+INCGNU = -I$(srcdir)/../../gnulib/import -I$(GNULIB_BUILDDIR)/import
 
 # Generated headers in the gnulib directory.  These must be listed
 # so that they are generated before other files are compiled.
@@ -500,7 +500,7 @@ stamp-h: config.in config.status
 Makefile: Makefile.in config.status
 	CONFIG_HEADERS="" $(SHELL) ./config.status
 
-$(GNULIB_BUILDDIR)/Makefile: $(srcdir)/../gnulib/Makefile.in config.status
+$(GNULIB_BUILDDIR)/Makefile: $(srcdir)/../../gnulib/Makefile.in config.status
 	  @cd $(GNULIB_BUILDDIR); CONFIG_FILES="Makefile" \
 	  CONFIG_COMMANDS="depfiles" \
 	  CONFIG_HEADERS= \
diff --git a/gdb/gdbserver/configure b/gdb/gdbserver/configure
index 5ffdeb0..e89f2d0 100755
--- a/gdb/gdbserver/configure
+++ b/gdb/gdbserver/configure
@@ -6073,7 +6073,7 @@ fi
 # "gnulib", to avoid the problem of both GDB and GDBserver wanting to
 # build it in the same directory, when building in the source dir.
 
-  in_src="../gnulib"
+  in_src="../../gnulib"
   in_build="build-gnulib-gdbserver"
   in_extra_args="$gnulib_extra_configure_args"
 
diff --git a/gdb/gdbserver/configure.ac b/gdb/gdbserver/configure.ac
index 98b2253..d943269 100644
--- a/gdb/gdbserver/configure.ac
+++ b/gdb/gdbserver/configure.ac
@@ -88,7 +88,7 @@ fi
 # gdbserver/.  We need to build gnulib under some other directory not
 # "gnulib", to avoid the problem of both GDB and GDBserver wanting to
 # build it in the same directory, when building in the source dir.
-ACX_CONFIGURE_DIR(["../gnulib"], ["build-gnulib-gdbserver"],
+ACX_CONFIGURE_DIR(["../../gnulib"], ["build-gnulib-gdbserver"],
                   ["$gnulib_extra_configure_args"])
 
 ACX_CONFIGURE_DIR(["../../libiberty"], ["build-libiberty-gdbserver"])