diff --git a/llvm/lib/Support/ToolOutputFile.cpp b/llvm/lib/Support/ToolOutputFile.cpp
index 09fb6ee..824e0a7 100644
--- a/llvm/lib/Support/ToolOutputFile.cpp
+++ b/llvm/lib/Support/ToolOutputFile.cpp
@@ -44,3 +44,7 @@
   if (!ErrorInfo.empty())
     Installer.Keep = true;
 }
+
+tool_output_file::tool_output_file(const char *Filename, int FD)
+    : Installer(Filename), OS(FD, true) {
+}