Index: lib/Driver/Driver.cpp
===================================================================
--- lib/Driver/Driver.cpp
+++ lib/Driver/Driver.cpp
@@ -1401,6 +1401,11 @@
         C.CleanupFileMap(C.getFailureResultFiles(), JA, true);
     }
 
+    // llvm/lib/Support/Unix/Signals.inc will exit with a special return code
+    // for SIGPIPE. Do not print diagnostics for this case.
+    if (Res == 71)
+      continue;
+
     // Print extra information about abnormal failures, if possible.
     //
     // This is ad-hoc, but we don't want to be excessively noisy. If the result