Test --wrapper in extended-remote

We didn't test --wrapper option in extended-remote before, this patch
is to add a test case for it.  In order to pass option --wrapper to
gdbserver in extended-remote, I add arg in gdbserver_start_extended,
and its default value is "", so that other places use
gdbserver_start_extended don't have to be updated.

gdb/testsuite:

2015-07-24  Yao Qi  <yao.qi@linaro.org>

	* lib/gdbserver-support.exp (gdbserver_start_extended): Add
	argument options.
	* gdb.server/ext-wrapper.exp: New file.

1 files changed, 11 insertions, 5 deletions

diff --git a/gdb/testsuite/lib/gdbserver-support.exp b/gdb/testsuite/lib/gdbserver-support.exp
index 6c3401c..e6d8f2c 100644
--- a/gdb/testsuite/lib/gdbserver-support.exp
+++ b/gdb/testsuite/lib/gdbserver-support.exp
@@ -434,15 +434,21 @@ proc gdbserver_reconnect { } {
     return [gdb_target_cmd $gdbserver_protocol $gdbserver_gdbport]
 }
 
-# Start and connect to a gdbserver in extended mode.  Note this frobs
-# $gdbserver_protocol, so should be used only from a board that
-# usually connects in target remote mode.
-proc gdbserver_start_extended { } {
+# Start gdbserver in extended mode with OPTIONS and connect to it.  Note
+# this frobs $gdbserver_protocol, so should be used only from a board
+# that usually connects in target remote mode.
+proc gdbserver_start_extended { {options ""} } {
     global gdbserver_protocol
     global gdbserver_gdbport
     global use_gdb_stub
 
-    if { [catch { gdbserver_start "--multi" "" } res] == 1 } {
+    set gdbserver_options "--multi"
+
+    if { $options != "" } {
+	append gdbserver_options " $options"
+    }
+
+    if { [catch { gdbserver_start $gdbserver_options "" } res] == 1 } {
 	perror $res
 	return 2
     }