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, 58 insertions, 0 deletions

diff --git a/gdbserver/acinclude.m4 b/gdbserver/acinclude.m4
new file mode 100644
index 0000000..5a28451
--- /dev/null
+++ b/gdbserver/acinclude.m4
@@ -0,0 +1,58 @@
+dnl gdb/gdbserver/configure.in uses BFD_HAVE_SYS_PROCFS_TYPE.
+m4_include(../bfd/bfd.m4)
+
+m4_include(../gdb/acx_configure_dir.m4)
+
+# This gets AM_GDB_WARNINGS.
+m4_include(../gdb/warning.m4)
+
+dnl This gets autoconf bugfixes
+m4_include(../config/override.m4)
+
+dnl For ACX_PKGVERSION and ACX_BUGURL.
+m4_include(../config/acx.m4)
+
+m4_include(../config/depstand.m4)
+m4_include(../config/lead-dot.m4)
+
+dnl Needed for common.m4
+dnl For AC_LIB_HAVE_LINKFLAGS.
+m4_include(../config/lib-ld.m4)
+m4_include(../config/lib-prefix.m4)
+m4_include(../config/lib-link.m4)
+dnl codeset.m4 is needed for common.m4, but not for
+dnl anything else in gdbserver.
+m4_include(../config/codeset.m4)
+m4_include(../gdbsupport/common.m4)
+
+dnl For libiberty_INIT.
+m4_include(../gdb/libiberty.m4)
+
+dnl For GDB_AC_PTRACE.
+m4_include(../gdb/ptrace.m4)
+
+m4_include(../gdb/ax_cxx_compile_stdcxx.m4)
+
+dnl For GDB_AC_SELFTEST.
+m4_include(../gdb/selftest.m4)
+
+m4_include([../config/ax_pthread.m4])
+
+dnl Check for existence of a type $1 in libthread_db.h
+dnl Based on BFD_HAVE_SYS_PROCFS_TYPE in bfd/bfd.m4.
+
+AC_DEFUN([GDBSERVER_HAVE_THREAD_DB_TYPE],
+[AC_MSG_CHECKING([for $1 in thread_db.h])
+ AC_CACHE_VAL(gdbserver_cv_have_thread_db_type_$1,
+   [AC_TRY_COMPILE([
+#include <thread_db.h>],
+      [$1 avar],
+      gdbserver_cv_have_thread_db_type_$1=yes,
+      gdbserver_cv_have_thread_db_type_$1=no
+   )])
+ if test $gdbserver_cv_have_thread_db_type_$1 = yes; then
+   AC_DEFINE([HAVE_]translit($1, [a-z], [A-Z]), 1,
+	     [Define if <thread_db.h> has $1.])
+ fi
+ AC_MSG_RESULT($gdbserver_cv_have_thread_db_type_$1)
+])