Index: lldb/trunk/packages/Python/lldbsuite/test/dotest.py
===================================================================
--- lldb/trunk/packages/Python/lldbsuite/test/dotest.py
+++ lldb/trunk/packages/Python/lldbsuite/test/dotest.py
@@ -50,7 +50,11 @@
 
 
 def is_exe(fpath):
-    """Returns true if fpath is an executable."""
+    """Returns true if fpath is an executable.
+       Exits with an error code if the specified path is invalid"""
+    if not os.path.exists(fpath):
+        print(fpath  + " is not a valid path, exiting")
+        sys.exit(-1)
     return os.path.isfile(fpath) and os.access(fpath, os.X_OK)