From e7b67d0e94df497791207618194e1db545ac3721 Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Fri, 20 Aug 2010 16:56:11 +0000
Subject: [PATCH] Diagnose attempts to update standard output.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111649 91177308-0d34-0410-b5e6-96231b3b80d8
---
 utils/FileUpdate/FileUpdate.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/utils/FileUpdate/FileUpdate.cpp b/utils/FileUpdate/FileUpdate.cpp
index b97d9cf74e5..8377aea79e8 100644
--- a/utils/FileUpdate/FileUpdate.cpp
+++ b/utils/FileUpdate/FileUpdate.cpp
@@ -36,6 +36,11 @@ int main(int argc, char **argv) {
   PrettyStackTraceProgram X(argc, argv);
   cl::ParseCommandLineOptions(argc, argv);
 
+  if (OutputFilename == "-") {
+    errs() << argv[0] << ": error: Can't update standard output\n";
+    return 1;
+  }
+
   // Get the input data.
   std::string ErrorStr;
   MemoryBuffer *In =
-- 
2.34.1