Index: compiler-rt/test/tsan/Darwin/gcd-groups-destructor.mm
===================================================================
--- compiler-rt/test/tsan/Darwin/gcd-groups-destructor.mm
+++ compiler-rt/test/tsan/Darwin/gcd-groups-destructor.mm
@@ -1,4 +1,4 @@
-// RUN: %clangxx_tsan %s -o %t -framework Foundation
+// RUN: %clangxx_tsan %s -o %t -framework Foundation -D__ALLOW_STDC_ATOMICS_IN_CXX__
 // RUN: %run %t 2>&1 | FileCheck %s
 
 #import <Foundation/Foundation.h>
Index: compiler-rt/test/tsan/Darwin/libcxx-shared-ptr-stress.mm
===================================================================
--- compiler-rt/test/tsan/Darwin/libcxx-shared-ptr-stress.mm
+++ compiler-rt/test/tsan/Darwin/libcxx-shared-ptr-stress.mm
@@ -1,4 +1,4 @@
-// RUN: %clangxx_tsan %s -o %t -framework Foundation
+// RUN: %clangxx_tsan %s -o %t -framework Foundation -D__ALLOW_STDC_ATOMICS_IN_CXX__
 // RUN: %run %t 2>&1 | FileCheck %s
 
 #import <Foundation/Foundation.h>
Index: compiler-rt/test/tsan/Darwin/xpc-race.mm
===================================================================
--- compiler-rt/test/tsan/Darwin/xpc-race.mm
+++ compiler-rt/test/tsan/Darwin/xpc-race.mm
@@ -1,4 +1,4 @@
-// RUN: %clangxx_tsan %s -o %t -framework Foundation
+// RUN: %clangxx_tsan %s -o %t -framework Foundation -D__ALLOW_STDC_ATOMICS_IN_CXX__
 // RUN: %deflake %run %t 2>&1 | FileCheck %s
 
 // UNSUPPORTED: ios