1 files changed, 7 insertions, 0 deletions
diff --git a/include/clang/Basic/SourceManager.h b/include/clang/Basic/SourceManager.h
index b8811b42c4..a19272f29d 100644
--- a/include/clang/Basic/SourceManager.h
+++ b/include/clang/Basic/SourceManager.h
@@ -452,6 +452,13 @@ public:
     return MainFileID;
   }
 
+  /// \brief Set the file ID for the precompiled preamble, which is also the
+  /// main file.
+  void SetPreambleFileID(FileID Preamble) {
+    assert(MainFileID.isInvalid() && "MainFileID already set!");
+    MainFileID = Preamble;
+  }
+  
   //===--------------------------------------------------------------------===//
   // Methods to create new FileID's and instantiations.
   //===--------------------------------------------------------------------===//