[PATCH] gdb, testsuite: use -no-prompt-anchor in step-over-thread-exit.exp

[Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>]

Running gdb.threads/step-over-thread-exit.exp with the
native-gdbserver boardfile sometimes fails with

  p $_thread == 2
  $1 = 1
  (gdb) [New Thread 2790806.2790823 (id 3)]

  Thread 3 "step-over-threa" hit Breakpoint 2, 0x00005555555552ab in my_exit_syscall () at /.../testsuite/lib/my-syscalls.S:85
  85      SYSCALL (my_exit, __NR_exit)
  FAIL: gdb.threads/step-over-thread-exit.exp: step_over_mode=inline: non-stop=on: target-non-stop=on: schedlock=off: cmd=next: ns_stop_all=0: selected thread didn't change (timeout)

The passing case is

  p $_thread == 2
  $1 = 1
  (gdb) PASS: gdb.threads/step-over-thread-exit.exp: step_over_mode=inline: non-stop=on: target-non-stop=on: schedlock=off: cmd=next: ns_stop_all=0: selected thread didn't change
  Remote debugging from host 127.0.0.1, port 32932
  [New Thread 2784047.2784049 (id 3)]

  Thread 3 "step-over-threa" hit Breakpoint 2, 0x00005555555552ab in my_exit_syscall () at /.../testsuite/lib/my-syscalls.S:85
  85      SYSCALL (my_exit, __NR_exit)

Fix the problem by using -no-prompt-anchor.  Since this is non-stop
mode, it should be ok to use the flag.
---
 gdb/testsuite/gdb.threads/step-over-thread-exit.exp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gdb/testsuite/gdb.threads/step-over-thread-exit.exp b/gdb/testsuite/gdb.threads/step-over-thread-exit.exp
index f398538058d..1dd1191afdc 100644
--- a/gdb/testsuite/gdb.threads/step-over-thread-exit.exp
+++ b/gdb/testsuite/gdb.threads/step-over-thread-exit.exp
@@ -185,7 +185,7 @@ proc test {step_over_mode non-stop target-non-stop schedlock cmd ns_stop_all} {
 			pass $gdb_test_name
 		    }
 		}
-		gdb_test "p \$_thread == $thread" "= 1" \
+		gdb_test -no-prompt-anchor "p \$_thread == $thread" "= 1" \
 		    "selected thread didn't change"
 	    }
 	} else {
-- 
2.34.1

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