Index: lib/tsan/rtl/tsan_libdispatch_mac.cc
===================================================================
--- lib/tsan/rtl/tsan_libdispatch_mac.cc
+++ lib/tsan/rtl/tsan_libdispatch_mac.cc
@@ -25,6 +25,13 @@
 #include <dispatch/dispatch.h>
 #include <pthread.h>
 
+// DISPATCH_NOESCAPE is not defined prior to XCode 8.
+#ifdef DISPATCH_NOESCAPE
+#define _DISPATCH_NOESCAPE DISPATCH_NOESCAPE
+#else
+#define _DISPATCH_NOESCAPE
+#endif
+
 typedef long long_t;  // NOLINT
 
 namespace __tsan {
@@ -178,7 +185,7 @@
 
 #define DISPATCH_INTERCEPT_SYNC_B(name, barrier)                             \
   TSAN_INTERCEPTOR(void, name, dispatch_queue_t q,                           \
-                   DISPATCH_NOESCAPE dispatch_block_t block) {               \
+                   _DISPATCH_NOESCAPE dispatch_block_t block) {              \
     SCOPED_TSAN_INTERCEPTOR(name, q, block);                                 \
     SCOPED_TSAN_INTERCEPTOR_USER_CALLBACK_START();                           \
     dispatch_block_t heap_block = Block_copy(block);                         \
@@ -268,7 +275,7 @@
 // need to undefine the macro.
 #undef dispatch_once
 TSAN_INTERCEPTOR(void, dispatch_once, dispatch_once_t *predicate,
-                 DISPATCH_NOESCAPE dispatch_block_t block) {
+                 _DISPATCH_NOESCAPE dispatch_block_t block) {
   SCOPED_INTERCEPTOR_RAW(dispatch_once, predicate, block);
   atomic_uint32_t *a = reinterpret_cast<atomic_uint32_t *>(predicate);
   u32 v = atomic_load(a, memory_order_acquire);
@@ -479,7 +486,7 @@
 
 TSAN_INTERCEPTOR(void, dispatch_apply, size_t iterations,
                  dispatch_queue_t queue,
-                 DISPATCH_NOESCAPE void (^block)(size_t)) {
+                 _DISPATCH_NOESCAPE void (^block)(size_t)) {
   SCOPED_TSAN_INTERCEPTOR(dispatch_apply, iterations, queue, block);
 
   void *parent_to_child_sync = nullptr;