Index: test/tsan/map32bit.cc
===================================================================
--- test/tsan/map32bit.cc
+++ test/tsan/map32bit.cc
@@ -11,6 +11,9 @@
 // XFAIL: mips64
 // XFAIL: aarch64
 
+// MAP_32BIT doesn't exist on OS X.
+// UNSUPPORTED: darwin
+
 void *Thread(void *ptr) {
   *(int*)ptr = 42;
   barrier_wait(&barrier);
Index: test/tsan/mutexset6.cc
===================================================================
--- test/tsan/mutexset6.cc
+++ test/tsan/mutexset6.cc
@@ -1,6 +1,9 @@
 // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
 #include "test.h"
 
+// OS X doesn't have pthread spinlocks.
+// UNSUPPORTED: darwin
+
 int Global;
 pthread_mutex_t mtx1;
 pthread_spinlock_t mtx2;
Index: test/tsan/thread_name2.cc
===================================================================
--- test/tsan/thread_name2.cc
+++ test/tsan/thread_name2.cc
@@ -1,6 +1,9 @@
 // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
 #include "test.h"
 
+// OS X doesn't have pthread_setname_np(tid, name).
+// UNSUPPORTED: darwin
+
 #if defined(__FreeBSD__)
 #include <pthread_np.h>
 #define pthread_setname_np pthread_set_name_np