Index: lib/asan/asan_interceptors.cc
===================================================================
--- lib/asan/asan_interceptors.cc
+++ lib/asan/asan_interceptors.cc
@@ -408,9 +408,27 @@
     return REAL(memcpy)(to, from, size);                                       \
   } while (0)
 
+#define ASAN_MEMMOVE_IMPL(ctx, to, from, size) do {                            \
+    if (UNLIKELY(!asan_inited))                                                \
+      return internal_memmove(to, from, size);                                 \
+    ENSURE_ASAN_INITED();                                                      \
+    if (flags()->replace_intrin) {                                             \
+      ASAN_READ_RANGE(ctx, from, size);                                        \
+      ASAN_WRITE_RANGE(ctx, to, size);                                         \
+    }                                                                          \
+    return internal_memmove(to, from, size);                                   \
+  } while (0)
 
 void *__asan_memcpy(void *to, const void *from, uptr size) {
+#if !SANITIZER_MAC && PLATFORM_HAS_DIFFERENT_MEMCPY_AND_MEMMOVE
   ASAN_MEMCPY_IMPL(nullptr, to, from, size);
+#else
+  ASAN_MEMMOVE_IMPL(nullptr, to, from, size);
+#endif
+}
+
+void *__asan_memmove(void *to, const void *from, uptr size) {
+  ASAN_MEMMOVE_IMPL(nullptr, to, from, size);
 }
 
 // memset is called inside Printf.
@@ -430,21 +448,6 @@
   ASAN_MEMSET_IMPL(nullptr, block, c, size);
 }
 
-#define ASAN_MEMMOVE_IMPL(ctx, to, from, size) do {                            \
-    if (UNLIKELY(!asan_inited))                                                \
-      return internal_memmove(to, from, size);                                 \
-    ENSURE_ASAN_INITED();                                                      \
-    if (flags()->replace_intrin) {                                             \
-      ASAN_READ_RANGE(ctx, from, size);                                        \
-      ASAN_WRITE_RANGE(ctx, to, size);                                         \
-    }                                                                          \
-    return internal_memmove(to, from, size);                                   \
-  } while (0)
-
-void *__asan_memmove(void *to, const void *from, uptr size) {
-  ASAN_MEMMOVE_IMPL(nullptr, to, from, size);
-}
-
 INTERCEPTOR(void*, memmove, void *to, const void *from, uptr size) {
   void *ctx;
   ASAN_INTERCEPTOR_ENTER(ctx, memmove);
@@ -454,7 +457,7 @@
 INTERCEPTOR(void*, memcpy, void *to, const void *from, uptr size) {
   void *ctx;
   ASAN_INTERCEPTOR_ENTER(ctx, memcpy);
-#if !SANITIZER_MAC
+#if !SANITIZER_MAC && PLATFORM_HAS_DIFFERENT_MEMCPY_AND_MEMMOVE
   ASAN_MEMCPY_IMPL(ctx, to, from, size);
 #else
   // At least on 10.7 and 10.8 both memcpy() and memmove() are being replaced