From da69832140a69fd88327473d5ab691bf9ef82514 Mon Sep 17 00:00:00 2001
From: Mark Whitehorn <kd0aij@gmail.com>
Date: Sun, 11 Feb 2018 20:53:41 -0700
Subject: [PATCH] AP_HAL_ChibiOS: add #ifdef around toneAlarm thread stack
 declaration

---
 libraries/AP_HAL_ChibiOS/Scheduler.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libraries/AP_HAL_ChibiOS/Scheduler.cpp b/libraries/AP_HAL_ChibiOS/Scheduler.cpp
index cae10725f2..077fad73bc 100644
--- a/libraries/AP_HAL_ChibiOS/Scheduler.cpp
+++ b/libraries/AP_HAL_ChibiOS/Scheduler.cpp
@@ -37,7 +37,9 @@ using namespace ChibiOS;
 extern const AP_HAL::HAL& hal;
 THD_WORKING_AREA(_timer_thread_wa, 2048);
 THD_WORKING_AREA(_rcin_thread_wa, 512);
+#ifdef HAL_PWM_ALARM
 THD_WORKING_AREA(_toneAlarm_thread_wa, 512);
+#endif
 THD_WORKING_AREA(_io_thread_wa, 2048);
 THD_WORKING_AREA(_storage_thread_wa, 2048);
 #if HAL_WITH_UAVCAN