[pushed 1/3] [gdb/testsuite] Consume output asap in gdb.server/multi-ui-errors.exp

[Tom de Vries <tdevries@suse.de>]

With test-case gdb.server/multi-ui-errors.exp we see:
...
(gdb) PASS: multi-ui-errors.exp: main UI, prompt after gdbserver dies
continue^M
Continuing.^M
echo^M
(gdb) PASS: multi-ui-errors.exp: extra UI, prompt after gdbserver dies
...

The continue is issued earlier in the test-case, but the output has not been
consumed, which makes it show up much later.

Consume the continue output asap, to make it clear when the continue is issued:
...
(gdb) PASS: gdb.server/multi-ui-errors.exp: connect to gdbserver
continue^M
Continuing.^M
PASS: gdb.server/multi-ui-errors.exp: continue - extra UI
...

Tested on x86_64-linux.
---
 gdb/testsuite/gdb.server/multi-ui-errors.exp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/gdb/testsuite/gdb.server/multi-ui-errors.exp b/gdb/testsuite/gdb.server/multi-ui-errors.exp
index d3ddd0f2d08..8a1276fb272 100644
--- a/gdb/testsuite/gdb.server/multi-ui-errors.exp
+++ b/gdb/testsuite/gdb.server/multi-ui-errors.exp
@@ -75,7 +75,13 @@ with_spawn_id $extra_spawn_id {
 with_spawn_id $extra_spawn_id {
     gdb_test "target $gdbserver_protocol $gdbserver_gdbport" ".*" \
 	"connect to gdbserver"
-    send_gdb "continue\n"
+
+    # Issue a continue and consume the response.  Don't expect a prompt.
+    gdb_test_multiple "continue" "continue - extra UI" {
+	-re  "\r\nContinuing\.\r\n" {
+	    pass $gdb_test_name
+	}
+    }
 }
 
 # We're going to kill the gdbserver, but before we do, lets make sure
-- 
2.35.3