[PATCH v4 5/7] fix issue: gdb hangs in the command following a commad returning with TARGET_WAITKIND_NO_HISTORY

[Zied Guermazi <zied.guermazi@trande.de>]

This patch fixes an issue observed with btrace when replaying the execution.
The issue was observed on ARMv7 processors.
To reproduce the issue, the user needs to replay in forward direction 
until he reaches the end of history, then replay backwards 
(e.g a reverse-next) and then replay forwards. GDB hangs and the user
can not issue new commands.
This fix keeps the same behaviour of gdb as when TARGET_WAITKIND_NO_HISTORY
is hit on other architectures.

gdb/ChangeLog

	* infrun.c (set_step_over_info): add debug print.
	(handle_inferior_event): clear step over info 
	in case TARGET_WAITKIND_NO_HISTORY.

---
 gdb/infrun.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gdb/infrun.c b/gdb/infrun.c
index a271220b261..9c2522376f2 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -1308,6 +1308,7 @@ set_step_over_info (const address_space *aspace, CORE_ADDR address,
 		    int nonsteppable_watchpoint_p,
 		    int thread)
 {
+  infrun_debug_printf ("setting step over info");
   step_over_info.aspace = aspace;
   step_over_info.address = address;
   step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p;
@@ -5536,7 +5537,7 @@ handle_inferior_event (struct execution_control_state *ecs)
       delete_just_stopped_threads_single_step_breakpoints ();
       ecs->event_thread->suspend.stop_pc
 	= regcache_read_pc (get_thread_regcache (inferior_thread ()));
-
+      clear_step_over_info ();
       if (handle_stop_requested (ecs))
 	return;
 
-- 
2.25.1