From ad3adbdaa40329345dd8005a772a582f286cf45f Mon Sep 17 00:00:00 2001
From: Alex Guteniev <gutenev@gmail.com>
Date: Thu, 23 Apr 2020 17:27:24 +0300
Subject: [PATCH] Fix #739  (without saving stack variable)

---
 stl/inc/atomic | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/stl/inc/atomic b/stl/inc/atomic
index 886a69d0b5..de4068477f 100644
--- a/stl/inc/atomic
+++ b/stl/inc/atomic
@@ -1942,8 +1942,8 @@ extern "C" inline void atomic_thread_fence(const memory_order _Order) noexcept {
 #else // ^^^ ARM32/ARM64 hardware / x86/x64 hardware vvv
     _Compiler_barrier();
     if (_Order == memory_order_seq_cst) {
-        static long _Guard;
-        (void) _InterlockedCompareExchange(&_Guard, 0, 0);
+        volatile long _Guard;
+        (void) _InterlockedExchange(&_Guard, 0);
         _Compiler_barrier();
     }
 #endif // hardware