Diagnose attempts to update standard output.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111649 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/utils/FileUpdate/FileUpdate.cpp b/utils/FileUpdate/FileUpdate.cpp
index b97d9cf74e55af786e5b6c2582c3566553b22a78..8377aea79e84fdaa8f3e3454a278cba75c0a45ca 100644 (file)
--- 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 =