Index: cfe/trunk/include/clang/Driver/Compilation.h
===================================================================
--- cfe/trunk/include/clang/Driver/Compilation.h
+++ cfe/trunk/include/clang/Driver/Compilation.h
@@ -252,6 +252,15 @@
 
   /// Return true if we're compiling for diagnostics.
   bool isForDiagnostics() const { return ForDiagnostics; }
+
+  /// Redirect - Redirect output of this compilation. Can only be done once.
+  ///
+  /// \param Redirects - array of pointers to paths. The array
+  /// should have a size of three. The inferior process's
+  /// stdin(0), stdout(1), and stderr(2) will be redirected to the
+  /// corresponding paths. This compilation instance becomes
+  /// the owner of Redirects and will delete the array and StringRef's.
+  void Redirect(const StringRef** Redirects);
 };
 
 } // end namespace driver
Index: cfe/trunk/lib/Driver/Compilation.cpp
===================================================================
--- cfe/trunk/lib/Driver/Compilation.cpp
+++ cfe/trunk/lib/Driver/Compilation.cpp
@@ -45,6 +45,7 @@
 
   // Free redirections of stdout/stderr.
   if (Redirects) {
+    delete Redirects[0];
     delete Redirects[1];
     delete Redirects[2];
     delete [] Redirects;
@@ -213,3 +214,7 @@
 StringRef Compilation::getSysRoot() const {
   return getDriver().SysRoot;
 }
+
+void Compilation::Redirect(const StringRef** Redirects) {
+  this->Redirects = Redirects;
+}