Move gdbserver to top level

This patch moves gdbserver to the top level.

This patch is as close to a pure move as possible -- gdbserver still
builds its own variant of gnulib and gdbsupport.  Changing this will
be done in a separate patch.

[v2] Note that, per Simon's review comment, this patch changes the
tree so that gdbserver is not built for or1k or score.  This makes
sense, because there is apparently not actually a gdbserver port here.

[v3] This version of the patch also splits out some configury into a
new file, gdbserver/configure.host, so that the top-level configure
script can simply rely on it in order to decide whether gdbserver
should be built.

[v4] This version adds documentation and removes some unnecessary
top-level dependencies.

[v5] Update docs to mention "make all-gdbserver" and change how
top-level configure decides whether to build gdbserver, switching to a
single, shared script.

Tested by the buildbot.

ChangeLog
2020-02-07  Tom Tromey  <tom@tromey.com>
	    Pedro Alves  <palves@redhat.com>

	* src-release.sh (GDB_SUPPORT_DIRS): Add gdbserver.
	* gdbserver: New directory, moved from gdb/gdbserver.
	* configure.ac (host_tools): Add gdbserver.
	Only build gdbserver on certain systems.
	* Makefile.in, configure: Rebuild.
	* Makefile.def (host_modules, dependencies): Add gdbserver.
	* MAINTAINERS: Add gdbserver.

gdb/ChangeLog
2020-02-07  Tom Tromey  <tom@tromey.com>

	* README: Update gdbserver documentation.
	* gdbserver: Move to top level.
	* configure.tgt (build_gdbserver): Remove.
	* configure.ac: Remove --enable-gdbserver.
	* configure: Rebuild.
	* Makefile.in (distclean): Don't mention gdbserver.

Change-Id: I826b7565b54604711dc7a11edea0499cd51ff39e

1 files changed, 0 insertions, 204 deletions

diff --git a/gdb/gdbserver/tdesc.c b/gdb/gdbserver/tdesc.c
deleted file mode 100644
index de25e7c..0000000
--- a/gdb/gdbserver/tdesc.c
+++ /dev/null
@@ -1,204 +0,0 @@
-/* Copyright (C) 2012-2020 Free Software Foundation, Inc.
-
-   This file is part of GDB.
-
-   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 "server.h"
-#include "tdesc.h"
-#include "regdef.h"
-
-#ifndef IN_PROCESS_AGENT
-
-target_desc::~target_desc ()
-{
-  xfree ((char *) arch);
-  xfree ((char *) osabi);
-}
-
-bool target_desc::operator== (const target_desc &other) const
-{
-  if (reg_defs != other.reg_defs)
-    return false;
-
-  /* Compare expedite_regs.  */
-  int i = 0;
-  for (; expedite_regs[i] != NULL; i++)
-    {
-      if (strcmp (expedite_regs[i], other.expedite_regs[i]) != 0)
-	return false;
-    }
-  if (other.expedite_regs[i] != NULL)
-    return false;
-
-  return true;
-}
-
-#endif
-
-void target_desc::accept (tdesc_element_visitor &v) const
-{
-#ifndef IN_PROCESS_AGENT
-  v.visit_pre (this);
-
-  for (const tdesc_feature_up &feature : features)
-    feature->accept (v);
-
-  v.visit_post (this);
-#endif
-}
-
-void
-init_target_desc (struct target_desc *tdesc,
-		  const char **expedite_regs)
-{
-  int offset = 0;
-
-  /* Go through all the features and populate reg_defs.  */
-  for (const tdesc_feature_up &feature : tdesc->features)
-    for (const tdesc_reg_up &treg : feature->registers)
-      {
-	int regnum = treg->target_regnum;
-
-	/* Register number will increase (possibly with gaps) or be zero.  */
-	gdb_assert (regnum == 0 || regnum >= tdesc->reg_defs.size ());
-
-	if (regnum != 0)
-	  tdesc->reg_defs.resize (regnum, reg (offset));
-
-	tdesc->reg_defs.emplace_back (treg->name.c_str (), offset,
-				      treg->bitsize);
-	offset += treg->bitsize;
-      }
-
-  tdesc->registers_size = offset / 8;
-
-  /* Make sure PBUFSIZ is large enough to hold a full register
-     packet.  */
-  gdb_assert (2 * tdesc->registers_size + 32 <= PBUFSIZ);
-
-#ifndef IN_PROCESS_AGENT
-  tdesc->expedite_regs = expedite_regs;
-#endif
-}
-
-struct target_desc *
-allocate_target_description (void)
-{
-  return new target_desc ();
-}
-
-#ifndef IN_PROCESS_AGENT
-
-static const struct target_desc default_description {};
-
-void
-copy_target_description (struct target_desc *dest,
-			 const struct target_desc *src)
-{
-  dest->reg_defs = src->reg_defs;
-  dest->expedite_regs = src->expedite_regs;
-  dest->registers_size = src->registers_size;
-  dest->xmltarget = src->xmltarget;
-}
-
-const struct target_desc *
-current_target_desc (void)
-{
-  if (current_thread == NULL)
-    return &default_description;
-
-  return current_process ()->tdesc;
-}
-
-/* See gdbsupport/tdesc.h.  */
-
-const char *
-tdesc_architecture_name (const struct target_desc *target_desc)
-{
-  return target_desc->arch;
-}
-
-/* See gdbsupport/tdesc.h.  */
-
-void
-set_tdesc_architecture (struct target_desc *target_desc,
-			const char *name)
-{
-  target_desc->arch = xstrdup (name);
-}
-
-/* See gdbsupport/tdesc.h.  */
-
-const char *
-tdesc_osabi_name (const struct target_desc *target_desc)
-{
-  return target_desc->osabi;
-}
-
-/* See gdbsupport/tdesc.h.  */
-
-void
-set_tdesc_osabi (struct target_desc *target_desc, const char *name)
-{
-  target_desc->osabi = xstrdup (name);
-}
-
-/* See gdbsupport/tdesc.h.  */
-
-const char *
-tdesc_get_features_xml (const target_desc *tdesc)
-{
-  /* Either .xmltarget or .features is not NULL.  */
-  gdb_assert (tdesc->xmltarget != NULL
-	      || (!tdesc->features.empty ()
-		  && tdesc->arch != NULL));
-
-  if (tdesc->xmltarget == NULL)
-    {
-      std::string buffer ("@");
-      print_xml_feature v (&buffer);
-      tdesc->accept (v);
-      tdesc->xmltarget = xstrdup (buffer.c_str ());
-    }
-
-  return tdesc->xmltarget;
-}
-#endif
-
-/* See gdbsupport/tdesc.h.  */
-
-struct tdesc_feature *
-tdesc_create_feature (struct target_desc *tdesc, const char *name)
-{
-  struct tdesc_feature *new_feature = new tdesc_feature (name);
-  tdesc->features.emplace_back (new_feature);
-  return new_feature;
-}
-
-/* See gdbsupport/tdesc.h.  */
-
-bool
-tdesc_contains_feature (const target_desc *tdesc, const std::string &feature)
-{
-  gdb_assert (tdesc != nullptr);
-
-  for (const tdesc_feature_up &f : tdesc->features)
-    {
-      if (f->name == feature)
-	return true;
-    }
-
-  return false;
-}