GDBserver self tests

This patch uses GDB self test in GDBserver.  The self tests are run if
GDBserver is started with option --selftest.

gdb:

2017-08-18  Yao Qi  <yao.qi@linaro.org>

	* NEWS: Mention GDBserver's new option "--selftest".
	* Makefile.in (SFILES): Remove selftest.c, add common/selftest.c.
	* selftest.c: Move it to common/selftest.c.
	* selftest.h: Move it to common/selftest.h.
	* selftest-arch.c (reset): New function.
	(tests_with_arch): Call reset.

gdb/gdbserver:

2017-08-18  Yao Qi  <yao.qi@linaro.org>

	* Makefile.in (OBS): Add selftest.o.
	* configure.ac: AC_DEFINE GDB_SELF_TEST if $development.
	* configure, config.in: Re-generated.
	* server.c: Include common/sefltest.h.
	(captured_main): Handle option --selftest.

gdb/testsuite:

2017-08-18  Yao Qi  <yao.qi@linaro.org>

	* gdb.server/unittest.exp: New.

gdb/doc:

2017-08-18  Yao Qi  <yao.qi@linaro.org>

	* gdb.texinfo (Server): Document "--selftest".

2 files changed, 45 insertions, 0 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 39c49b8d0ea..d188f83cca4 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2017-08-18  Yao Qi  <yao.qi@linaro.org>
+
+	* gdb.server/unittest.exp: New.
+
 2017-08-15  Sergio Durigan Junior  <sergiodj@redhat.com>
 
 	PR gdb/21954
diff --git a/gdb/testsuite/gdb.server/unittest.exp b/gdb/testsuite/gdb.server/unittest.exp
new file mode 100644
index 00000000000..584a23d51c1
--- /dev/null
+++ b/gdb/testsuite/gdb.server/unittest.exp
@@ -0,0 +1,41 @@
+# This testcase is part of GDB, the GNU debugger.
+
+# Copyright 2017 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/>.
+
+load_lib gdbserver-support.exp
+
+standard_testfile
+
+if { [skip_gdbserver_tests] } {
+    return 0
+}
+
+global server_spawn_id
+
+set gdbserver [find_gdbserver]
+set gdbserver_command "$gdbserver --selftest"
+
+set server_spawn_id [remote_spawn target $gdbserver_command]
+
+gdb_expect {
+    -i $server_spawn_id
+    -re "Ran $decimal unit tests, 0 failed" {
+	pass "unit tests"
+    }
+    default {
+	fail "unit tests"
+    }
+}