Index: lib/Support/Unix/Signals.inc
===================================================================
--- lib/Support/Unix/Signals.inc
+++ lib/Support/Unix/Signals.inc
@@ -334,6 +334,10 @@
       if (auto OldInterruptFunction = InterruptFunction.exchange(nullptr))
         return OldInterruptFunction();
 
+      // Send a special return code that drivers can check for.
+      if (Sig == SIGPIPE)
+        exit(71);
+
       raise(Sig);   // Execute the default handler.
       return;
    }
Index: lib/Support/raw_ostream.cpp
===================================================================
--- lib/Support/raw_ostream.cpp
+++ lib/Support/raw_ostream.cpp
@@ -709,6 +709,9 @@
           )
         continue;
 
+      if (errno == EPIPE)
+        break;
+
       // Otherwise it's a non-recoverable error. Note it and quit.
       error_detected(std::error_code(errno, std::generic_category()));
       break;