Index: utils/lit/lit/TestRunner.py
===================================================================
--- utils/lit/lit/TestRunner.py
+++ utils/lit/lit/TestRunner.py
@@ -695,7 +695,7 @@
     root, not test source root."""
     execpath = test.getExecPath()
     execdir,execbase = os.path.split(execpath)
-    tmpDir = os.path.join(execdir, 'Output')
+    tmpDir = os.path.join(execdir, 'Output', execbase + ".tmpdir")
     tmpBase = os.path.join(tmpDir, execbase)
     return tmpDir, tmpBase