Fix {mi-tracepoint-changed, mi-tsv-changed}.exp with native-extended-gdbserver

Fixes:

 -FAIL: gdb.trace/mi-tracepoint-changed.exp: reconnect: break-info 1
 +PASS: gdb.trace/mi-tracepoint-changed.exp: reconnect: tracepoint created
 +PASS: gdb.trace/mi-tracepoint-changed.exp: reconnect: tracepoint on marker is installed
 +PASS: gdb.trace/mi-tracepoint-changed.exp: reconnect: break-info 1


 -FAIL: gdb.trace/mi-tsv-changed.exp: upload: tsv1 created
 -FAIL: gdb.trace/mi-tsv-changed.exp: upload: tsv2 created
 +PASS: gdb.trace/mi-tsv-changed.exp: upload: tsv1 created
 +PASS: gdb.trace/mi-tsv-changed.exp: upload: tsv2 created

These tests do something like this:

 #0 - start gdb/gdbserver normally
 #1 - setup some things in the debug session
 #2 - disconnect from gdbserver
 #3 - restart gdb
 #4 - reconnect to gdbserver

The problem is that the native-extended-gdbserver board always spawns
a new gdbserver instance in #3 (and has gdb connect to that).  So when
the test gets to #4, it connects to that new instance instead of the
old one:

 (gdb) spawn ../gdbserver/gdbserver --multi :2354
 Listening on port 2354
 target extended-remote localhost:2354
 Remote debugging using localhost:2354
 ...
 spawn ../gdbserver/gdbserver --multi :2355
 Listening on port 2355
 47-target-select extended-remote localhost:2355
 =tsv-created,name="trace_timestamp",initial="0"\n
 47^connected
 (gdb)
 ...
 47-target-select extended-remote localhost:2355
 47^connected
 (gdb)
 FAIL: gdb.trace/mi-tsv-changed.exp: upload: tsv1 created
 FAIL: gdb.trace/mi-tsv-changed.exp: upload: tsv2 created

testsuite/ChangeLog:
2015-04-16  Pedro Alves  <palves@redhat.com>

	* boards/native-extended-gdbserver.exp (mi_gdb_start): Don't start
	a new gdbserver if gdbserver_reconnect_p is set.

2 files changed, 12 insertions, 2 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 7739325..2000dbe 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,5 +1,10 @@
 2015-04-16  Pedro Alves  <palves@redhat.com>
 
+	* boards/native-extended-gdbserver.exp (mi_gdb_start): Don't start
+	a new gdbserver if gdbserver_reconnect_p is set.
+
+2015-04-16  Pedro Alves  <palves@redhat.com>
+
 	* lib/gdbserver-support.exp (gdb_exit): If gdbserver_reconnect_p
 	is set, don't exit gdbserver.
 
diff --git a/gdb/testsuite/boards/native-extended-gdbserver.exp b/gdb/testsuite/boards/native-extended-gdbserver.exp
index 8d299ef..744e044 100644
--- a/gdb/testsuite/boards/native-extended-gdbserver.exp
+++ b/gdb/testsuite/boards/native-extended-gdbserver.exp
@@ -64,14 +64,19 @@ if { [info procs extended_gdbserver_mi_gdb_start] == "" } {
     rename mi_gdb_start extended_gdbserver_mi_gdb_start
 }
 proc mi_gdb_start { args } {
+    global gdbserver_reconnect_p
+
     # Spawn GDB.
     set res [extended_gdbserver_mi_gdb_start $args]
     if { $res } {
 	return $res
     }
 
-    # And then GDBserver, ready for extended-remote mode.
-    mi_gdbserver_start_multi
+    # And then spawn GDBserver and connect to it in extended-remote
+    # mode, unless the test wants to explicitly test reconnection.
+    if {![info exists gdbserver_reconnect_p] || !$gdbserver_reconnect_p} {
+	mi_gdbserver_start_multi
+    }
     return 0
 }