[gdb/testsuite] Handle unreachable network in server-connect.exp

When running gdb.server/server-connect.exp I run into:
...
FAIL: gdb.server/server-connect.exp: tcp6: connect to gdbserver using tcp6:::1
FAIL: gdb.server/server-connect.exp: tcp6-with-brackets: connect to gdbserver \
  using tcp6:[::1]
FAIL: gdb.server/server-connect.exp: udp6: connect to gdbserver using udp6:::1
FAIL: gdb.server/server-connect.exp: udp6-with-brackets: connect to gdbserver \
  using udp6:[::1]
...

The FAIL is caused by the fact that the ipv6 loopback address is not available:
...
PASS: gdb.server/server-connect.exp: tcp6: start gdbserver
target remote tcp6:::1:2347^M
A program is being debugged already.  Kill it? (y or n) y^M
tcp6:::1:2347: Network is unreachable.^M
(gdb) FAIL: gdb.server/server-connect.exp: tcp6: connect to gdbserver using tcp6:::1
...
This should be marked UNSUPPORTED rather than FAIL.

Furthermore, the test-case takes about 4 minutes, because the 'Network is
unreachable' response is not explicitly handled in gdb_target_cmd, so instead
it runs into the timeout case.

Fix this by handling the 'Network is unreachable' response as UNSUPPORTED.
This reduces testing time from 4 minutes to about 2 seconds.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-09-19  Tom de Vries  <tdevries@suse.de>

	* lib/gdbserver-support.exp (gdb_target_cmd_ext): Return 2 (meaning
	UNSUPPORTED) for 'Network is unreachable' message.  Factor out of ...
	(gdb_target_cmd): ... here.
	* gdb.server/server-connect.exp: Use gdb_target_cmd_ext, handle return
	value 2.

3 files changed, 26 insertions, 5 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 83d5a4f..2acc1f7 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,11 @@
+2019-09-19  Tom de Vries  <tdevries@suse.de>
+
+	* lib/gdbserver-support.exp (gdb_target_cmd_ext): Return 2 (meaning
+	UNSUPPORTED) for 'Network is unreachable' message.  Factor out of ...
+	(gdb_target_cmd): ... here.
+	* gdb.server/server-connect.exp: Use gdb_target_cmd_ext, handle return
+	value 2.
+
 2019-09-18  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	* gdb.base/source-dir.exp: Avoid having directory names in test
diff --git a/gdb/testsuite/gdb.server/server-connect.exp b/gdb/testsuite/gdb.server/server-connect.exp
index 682fdaa..e69f792 100644
--- a/gdb/testsuite/gdb.server/server-connect.exp
+++ b/gdb/testsuite/gdb.server/server-connect.exp
@@ -101,10 +101,13 @@ save_vars { GDB_TEST_SOCKETHOST } {
 	    set gdbserver_gdbport [lindex $res 1]
 	    set test "connect to gdbserver using $sockhost"
 
-	    if { [gdb_target_cmd $gdbserver_protocol $gdbserver_gdbport] == 0 } {
+	    set res [gdb_target_cmd_ext $gdbserver_protocol $gdbserver_gdbport]
+	    if { $res == 0 } {
 		pass $test
-	    } else {
+	    } elseif { $res == 1 }  {
 		fail $test
+	    } else {
+		unsupported $test
 	    }
 	}
     }
diff --git a/gdb/testsuite/lib/gdbserver-support.exp b/gdb/testsuite/lib/gdbserver-support.exp
index ade99c0..2ad53c1 100644
--- a/gdb/testsuite/lib/gdbserver-support.exp
+++ b/gdb/testsuite/lib/gdbserver-support.exp
@@ -41,12 +41,13 @@
 #
 
 #
-# gdb_target_cmd
-# Send gdb the "target" command.  Returns 0 on success, 1 on failure.
+# gdb_target_cmd_ext
+# Send gdb the "target" command.  Returns 0 on success, 1 on failure, 2 on
+# unsupported.
 # If specified, then ADDITIONAL_TEXT must match the text that comes after
 # the connection message in order for the procedure to succeed.
 #
-proc gdb_target_cmd { targetname serialport {additional_text ""} } {
+proc gdb_target_cmd_ext { targetname serialport {additional_text ""} } {
     global gdb_prompt
 
     set serialport_re [string_to_regexp $serialport]
@@ -97,6 +98,9 @@ proc gdb_target_cmd { targetname serialport {additional_text ""} } {
 		# Leave it there for the test to diagnose.
 		return 1
 	    }
+	    -re ": Network is unreachable.\r\n.*$gdb_prompt $" {
+		return 2
+	    }
 	    timeout {
 		send_gdb ""
 		break
@@ -106,6 +110,12 @@ proc gdb_target_cmd { targetname serialport {additional_text ""} } {
     return 1
 }
 
+# Like gdb_target_cmd_ext, but returns 0 on success, 1 on failure.
+
+proc gdb_target_cmd { $args } {
+    set res [gdb_target_cmd_ext $args]
+    return [expr $res == 0 ? 0 : 1]
+}
 
 global portnum
 set portnum "2345"