Move gdbsupport to the top level

This patch moves the gdbsupport directory to the top level.  This is
the next step in the ongoing project to move gdbserver to the top
level.

The bulk of this patch was created by "git mv gdb/gdbsupport gdbsupport".

This patch then adds a build system to gdbsupport and wires it into
the top level.  Then it changes gdb to use the top-level build.

gdbserver, on the other hand, is not yet changed.  It still does its
own build of gdbsupport.

ChangeLog
2020-01-14  Tom Tromey  <tom@tromey.com>

	* src-release.sh (GDB_SUPPORT_DIRS): Add gdbsupport.
	* MAINTAINERS: Add gdbsupport.
	* configure: Rebuild.
	* configure.ac (configdirs): Add gdbsupport.
	* gdbsupport: New directory, move from gdb/gdbsupport.
	* Makefile.def (host_modules, dependencies): Add gnulib.
	* Makefile.in: Rebuild.

gdb/ChangeLog
2020-01-14  Tom Tromey  <tom@tromey.com>

	* nat/x86-linux-dregs.c: Include configh.h.
	* nat/linux-ptrace.c: Include configh.h.
	* nat/linux-btrace.c: Include configh.h.
	* defs.h: Include config.h, bfd.h.
	* configure.ac: Don't source common.host.
	(CONFIG_OBS, CONFIG_SRCS): Remove gdbsupport files.
	* configure: Rebuild.
	* acinclude.m4: Update path.
	* Makefile.in (SUPPORT, LIBSUPPORT, INCSUPPORT): New variables.
	(CONFIG_SRC_SUBDIR): Remove gdbsupport.
	(INTERNAL_CFLAGS_BASE): Add INCSUPPORT.
	(CLIBS): Add LIBSUPPORT.
	(CDEPS): Likewise.
	(COMMON_SFILES): Remove gdbsupport files.
	(HFILES_NO_SRCDIR): Likewise.
	(stamp-version): Update path to create-version.sh.
	(ALLDEPFILES): Remove gdbsupport files.

gdb/gdbserver/ChangeLog
2020-01-14  Tom Tromey  <tom@tromey.com>

	* server.h: Include config.h.
	* gdbreplay.c: Include config.h.
	* configure: Rebuild.
	* configure.ac: Don't source common.host.
	* acinclude.m4: Update path.
	* Makefile.in (INCSUPPORT): New variable.
	(INCLUDE_CFLAGS): Add INCSUPPORT.
	(SFILES): Update paths.
	(version-generated.c): Update path to create-version.sh.
	(gdbsupport/%-ipa.o, gdbsupport/%.o): Update paths.

gdbsupport/ChangeLog
2020-01-14  Tom Tromey  <tom@tromey.com>

	* common-defs.h: Add GDBSERVER case.  Update includes.
	* acinclude.m4, aclocal.m4, config.in, configure, configure.ac,
	Makefile.am, Makefile.in, README: New files.
	* Moved from ../gdb/gdbsupport/

Change-Id: I07632e7798635c1bab389bf885971e584fb4bb78

1 files changed, 103 insertions, 0 deletions

diff --git a/gdbsupport/environ.h b/gdbsupport/environ.h
new file mode 100644
index 0000000..8794a2a
--- /dev/null
+++ b/gdbsupport/environ.h
@@ -0,0 +1,103 @@
+/* Header for environment manipulation library.
+   Copyright (C) 1989-2020 Free Software Foundation, Inc.
+
+   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/>.  */
+
+#ifndef COMMON_ENVIRON_H
+#define COMMON_ENVIRON_H
+
+#include <vector>
+#include <set>
+
+/* Class that represents the environment variables as seen by the
+   inferior.  */
+
+class gdb_environ
+{
+public:
+  /* Regular constructor and destructor.  */
+  gdb_environ ()
+  {
+    /* Make sure that the vector contains at least a NULL element.
+       If/when we add more variables to it, NULL will always be the
+       last element.  */
+    m_environ_vector.push_back (NULL);
+  }
+
+  ~gdb_environ ()
+  {
+    clear ();
+  }
+
+  /* Move constructor.  */
+  gdb_environ (gdb_environ &&e)
+    : m_environ_vector (std::move (e.m_environ_vector)),
+      m_user_set_env (std::move (e.m_user_set_env)),
+      m_user_unset_env (std::move (e.m_user_unset_env))
+  {
+    /* Make sure that the moved-from vector is left at a valid
+       state (only one NULL element).  */
+    e.m_environ_vector.clear ();
+    e.m_environ_vector.push_back (NULL);
+    e.m_user_set_env.clear ();
+    e.m_user_unset_env.clear ();
+  }
+
+  /* Move assignment.  */
+  gdb_environ &operator= (gdb_environ &&e);
+
+  /* Create a gdb_environ object using the host's environment
+     variables.  */
+  static gdb_environ from_host_environ ();
+
+  /* Clear the environment variables stored in the object.  */
+  void clear ();
+
+  /* Return the value in the environment for the variable VAR.  The
+     returned pointer is only valid as long as the gdb_environ object
+     is not modified.  */
+  const char *get (const char *var) const;
+
+  /* Store VAR=VALUE in the environment.  */
+  void set (const char *var, const char *value);
+
+  /* Unset VAR in environment.  */
+  void unset (const char *var);
+
+  /* Return the environment vector represented as a 'char **'.  */
+  char **envp () const;
+
+  /* Return the user-set environment vector.  */
+  const std::set<std::string> &user_set_env () const;
+
+  /* Return the user-unset environment vector.  */
+  const std::set<std::string> &user_unset_env () const;
+
+private:
+  /* Unset VAR in environment.  If UPDATE_UNSET_LIST is true, then
+     also update M_USER_UNSET_ENV to reflect the unsetting of the
+     environment variable.  */
+  void unset (const char *var, bool update_unset_list);
+
+  /* A vector containing the environment variables.  */
+  std::vector<char *> m_environ_vector;
+
+  /* The environment variables explicitly set by the user.  */
+  std::set<std::string> m_user_set_env;
+
+  /* The environment variables explicitly unset by the user.  */
+  std::set<std::string> m_user_unset_env;
+};
+
+#endif /* COMMON_ENVIRON_H */