Index: clang-tools-extra/trunk/clang-tidy/tool/run-clang-tidy.py
===================================================================
--- clang-tools-extra/trunk/clang-tidy/tool/run-clang-tidy.py
+++ clang-tools-extra/trunk/clang-tidy/tool/run-clang-tidy.py
@@ -222,7 +222,7 @@
     if args.checks:
       invocation.append('-checks=' + args.checks)
     invocation.append('-')
-    print(subprocess.check_output(invocation))
+    subprocess.check_call(invocation)
   except:
     print("Unable to run clang-tidy.", file=sys.stderr)
     sys.exit(1)