Index: llvm/trunk/test/tools/lto/lit.local.cfg
===================================================================
--- llvm/trunk/test/tools/lto/lit.local.cfg
+++ llvm/trunk/test/tools/lto/lit.local.cfg
@@ -1,2 +1,6 @@
 if not ('ld64_plugin' in config.available_features and 'X86' in config.root.targets):
-   config.unsupported = True
+    config.unsupported = True
+
+# These tests invoke ld64 from the system, which is not leak-free
+if "Address" in config.llvm_use_sanitizer:
+    config.environment['ASAN_OPTIONS'] = 'detect_leaks=0'
Index: llvm/trunk/utils/lit/lit/llvm/config.py
===================================================================
--- llvm/trunk/utils/lit/lit/llvm/config.py
+++ llvm/trunk/utils/lit/lit/llvm/config.py
@@ -75,6 +75,9 @@
             features.add("long_tests")
 
         if target_triple:
+            if re.match(r'^x86_64.*-apple', target_triple):
+                if 'address' in sanitizers:
+                    self.with_environment('ASAN_OPTIONS', 'detect_leaks=1', append_path=True)
             if re.match(r'^x86_64.*-linux', target_triple):
                 features.add("x86_64-linux")
             if re.match(r'.*-win32$', target_triple):