--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/compiler-rt/test/tsan/atomic_free.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,31 @@
+// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t 2>&1 | FileCheck %s
+
+// Also check that atomics instrumentation can be configured by either driver or
+// legacy flags:
+
+// RUN: %clangxx_tsan -O1 %s -o %t -fno-sanitize-thread-atomics && not %deflake %run %t 2>&1 \
+// RUN:   | FileCheck --allow-empty --check-prefix=CHECK-NO-ATOMICS %s
+// RUN: %clangxx_tsan -O1 %s -o %t -mllvm -tsan-instrument-atomics=0 && not %deflake %run %t 2>&1 \
+// RUN:   | FileCheck --allow-empty --check-prefix=CHECK-NO-ATOMICS %s <%t
+
+#include "test.h"
+
+void *Thread(void *a) {
+  __atomic_fetch_add((int*)a, 1, __ATOMIC_SEQ_CST);
+  barrier_wait(&barrier);
+  return 0;
+}
+
+int main() {
+  barrier_init(&barrier, 2);
+  int *a = new int(0);
+  pthread_t t;
+  pthread_create(&t, 0, Thread, a);
+  barrier_wait(&barrier);
+  delete a;
+  pthread_join(t, 0);
+}
+
+// CHECK: WARNING: ThreadSanitizer: data race
+
+// CHECK-NO-ATOMICS-NOT: WARNING: ThreadSanitizer: data race