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, 140 deletions

diff --git a/gdb/gdbserver/debug.c b/gdb/gdbserver/debug.c
deleted file mode 100644
index 7bb2504..0000000
--- a/gdb/gdbserver/debug.c
+++ /dev/null
@@ -1,140 +0,0 @@
-/* Debugging routines for the remote server for GDB.
-   Copyright (C) 2014-2020 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 <chrono>
-
-#if !defined (IN_PROCESS_AGENT)
-int remote_debug = 0;
-#endif
-
-/* Output file for debugging.  Default to standard error.  */
-FILE *debug_file = stderr;
-
-/* See debug.h.  */
-int debug_threads;
-
-/* Include timestamps in debugging output.  */
-int debug_timestamp;
-
-#if !defined (IN_PROCESS_AGENT)
-
-/* See debug.h.  */
-
-void
-debug_set_output (const char *new_debug_file)
-{
-  /* Close any existing file and reset to standard error.  */
-  if (debug_file != stderr)
-    {
-      fclose (debug_file);
-    }
-  debug_file = stderr;
-
-  /* Catch empty filenames.  */
-  if (new_debug_file == nullptr || strlen (new_debug_file) == 0)
-    return;
-
-  FILE *fptr = fopen (new_debug_file, "w");
-
-  if (fptr == nullptr)
-    {
-      debug_printf ("Cannot open %s for writing. %s. Switching to stderr.\n",
-		    new_debug_file, safe_strerror (errno));
-      return;
-    }
-
-  debug_file = fptr;
-}
-
-#endif
-
-/* Print a debugging message.
-   If the text begins a new line it is preceded by a timestamp.
-   We don't get fancy with newline checking, we just check whether the
-   previous call ended with "\n".  */
-
-void
-debug_vprintf (const char *format, va_list ap)
-{
-#if !defined (IN_PROCESS_AGENT)
-  /* N.B. Not thread safe, and can't be used, as is, with IPA.  */
-  static int new_line = 1;
-
-  if (debug_timestamp && new_line)
-    {
-      using namespace std::chrono;
-
-      steady_clock::time_point now = steady_clock::now ();
-      seconds s = duration_cast<seconds> (now.time_since_epoch ());
-      microseconds us = duration_cast<microseconds> (now.time_since_epoch ()) - s;
-
-      fprintf (debug_file, "%ld.%06ld ", (long) s.count (), (long) us.count ());
-    }
-#endif
-
-  vfprintf (debug_file, format, ap);
-
-#if !defined (IN_PROCESS_AGENT)
-  if (*format)
-    new_line = format[strlen (format) - 1] == '\n';
-#endif
-}
-
-/* Flush debugging output.
-   This is called, for example, when starting an inferior to ensure all debug
-   output thus far appears before any inferior output.  */
-
-void
-debug_flush (void)
-{
-  fflush (debug_file);
-}
-
-/* Notify the user that the code is entering FUNCTION_NAME.
-   FUNCTION_NAME is the name of the calling function, or NULL if unknown.
-
-   This is intended to be called via the debug_enter macro.  */
-
-void
-do_debug_enter (const char *function_name)
-{
-  if (function_name != NULL)
-    debug_printf (">>>> entering %s\n", function_name);
-}
-
-/* Notify the user that the code is exiting FUNCTION_NAME.
-   FUNCTION_NAME is the name of the calling function, or NULL if unknown.
-
-   This is intended to be called via the debug_exit macro.  */
-
-void
-do_debug_exit (const char *function_name)
-{
-  if (function_name != NULL)
-    debug_printf ("<<<< exiting %s\n", function_name);
-}
-
-/* See debug.h.  */
-
-ssize_t
-debug_write (const void *buf, size_t nbyte)
-{
-  int fd = fileno (debug_file);
-  return write (fd, buf, nbyte);
-}