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, 244 deletions

diff --git a/gdb/gdbserver/inferiors.c b/gdb/gdbserver/inferiors.c
deleted file mode 100644
index 88adb16..0000000
--- a/gdb/gdbserver/inferiors.c
+++ /dev/null
@@ -1,244 +0,0 @@
-/* Inferior process information for the remote server for GDB.
-   Copyright (C) 2002-2020 Free Software Foundation, Inc.
-
-   Contributed by MontaVista Software.
-
-   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 "gdbsupport/common-inferior.h"
-#include "gdbthread.h"
-#include "dll.h"
-
-std::list<process_info *> all_processes;
-std::list<thread_info *> all_threads;
-
-struct thread_info *current_thread;
-
-/* The current working directory used to start the inferior.  */
-static const char *current_inferior_cwd = NULL;
-
-struct thread_info *
-add_thread (ptid_t thread_id, void *target_data)
-{
-  struct thread_info *new_thread = XCNEW (struct thread_info);
-
-  new_thread->id = thread_id;
-  new_thread->last_resume_kind = resume_continue;
-  new_thread->last_status.kind = TARGET_WAITKIND_IGNORE;
-
-  all_threads.push_back (new_thread);
-
-  if (current_thread == NULL)
-    current_thread = new_thread;
-
-  new_thread->target_data = target_data;
-
-  return new_thread;
-}
-
-/* See gdbthread.h.  */
-
-struct thread_info *
-get_first_thread (void)
-{
-  if (!all_threads.empty ())
-    return all_threads.front ();
-  else
-    return NULL;
-}
-
-struct thread_info *
-find_thread_ptid (ptid_t ptid)
-{
-  return find_thread ([&] (thread_info *thread) {
-    return thread->id == ptid;
-  });
-}
-
-/* Find a thread associated with the given PROCESS, or NULL if no
-   such thread exists.  */
-
-static struct thread_info *
-find_thread_process (const struct process_info *const process)
-{
-  return find_any_thread_of_pid (process->pid);
-}
-
-/* See gdbthread.h.  */
-
-struct thread_info *
-find_any_thread_of_pid (int pid)
-{
-  return find_thread (pid, [] (thread_info *thread) {
-    return true;
-  });
-}
-
-static void
-free_one_thread (thread_info *thread)
-{
-  free_register_cache (thread_regcache_data (thread));
-  free (thread);
-}
-
-void
-remove_thread (struct thread_info *thread)
-{
-  if (thread->btrace != NULL)
-    target_disable_btrace (thread->btrace);
-
-  discard_queued_stop_replies (ptid_of (thread));
-  all_threads.remove (thread);
-  free_one_thread (thread);
-  if (current_thread == thread)
-    current_thread = NULL;
-}
-
-void *
-thread_target_data (struct thread_info *thread)
-{
-  return thread->target_data;
-}
-
-struct regcache *
-thread_regcache_data (struct thread_info *thread)
-{
-  return thread->regcache_data;
-}
-
-void
-set_thread_regcache_data (struct thread_info *thread, struct regcache *data)
-{
-  thread->regcache_data = data;
-}
-
-void
-clear_inferiors (void)
-{
-  for_each_thread (free_one_thread);
-  all_threads.clear ();
-
-  clear_dlls ();
-
-  current_thread = NULL;
-}
-
-struct process_info *
-add_process (int pid, int attached)
-{
-  process_info *process = new process_info (pid, attached);
-
-  all_processes.push_back (process);
-
-  return process;
-}
-
-/* Remove a process from the common process list and free the memory
-   allocated for it.
-   The caller is responsible for freeing private data first.  */
-
-void
-remove_process (struct process_info *process)
-{
-  clear_symbol_cache (&process->symbol_cache);
-  free_all_breakpoints (process);
-  gdb_assert (find_thread_process (process) == NULL);
-  all_processes.remove (process);
-  delete process;
-}
-
-process_info *
-find_process_pid (int pid)
-{
-  return find_process ([&] (process_info *process) {
-    return process->pid == pid;
-  });
-}
-
-/* Get the first process in the process list, or NULL if the list is empty.  */
-
-process_info *
-get_first_process (void)
-{
-  if (!all_processes.empty ())
-    return all_processes.front ();
-  else
-    return NULL;
-}
-
-/* Return non-zero if there are any inferiors that we have created
-   (as opposed to attached-to).  */
-
-int
-have_started_inferiors_p (void)
-{
-  return find_process ([] (process_info *process) {
-    return !process->attached;
-  }) != NULL;
-}
-
-/* Return non-zero if there are any inferiors that we have attached to.  */
-
-int
-have_attached_inferiors_p (void)
-{
-  return find_process ([] (process_info *process) {
-    return process->attached;
-  }) != NULL;
-}
-
-struct process_info *
-get_thread_process (const struct thread_info *thread)
-{
-  return find_process_pid (thread->id.pid ());
-}
-
-struct process_info *
-current_process (void)
-{
-  gdb_assert (current_thread != NULL);
-  return get_thread_process (current_thread);
-}
-
-/* See gdbsupport/common-gdbthread.h.  */
-
-void
-switch_to_thread (process_stratum_target *ops, ptid_t ptid)
-{
-  gdb_assert (ptid != minus_one_ptid);
-  current_thread = find_thread_ptid (ptid);
-}
-
-/* See gdbsupport/common-inferior.h.  */
-
-const char *
-get_inferior_cwd ()
-{
-  return current_inferior_cwd;
-}
-
-/* See gdbsupport/common-inferior.h.  */
-
-void
-set_inferior_cwd (const char *cwd)
-{
-  xfree ((void *) current_inferior_cwd);
-  if (cwd != NULL)
-    current_inferior_cwd = xstrdup (cwd);
-  else
-    current_inferior_cwd = NULL;
-}