Index: lib/asan/tests/asan_test_main.cc
===================================================================
--- lib/asan/tests/asan_test_main.cc
+++ lib/asan/tests/asan_test_main.cc
@@ -28,7 +28,13 @@
 
 namespace __sanitizer {
 bool ReexecDisabled() {
+#if __has_feature(address_sanitizer) && SANITIZER_MAC
+  // Allow re-exec in instrumented unit tests on Darwin, as we need it to be
+  // run on 10.10 and below.
+  return false;
+#else
   return true;
+#endif
 }
 }