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diff --git a/tools/CIndex/CIndexDiagnostic.h b/tools/CIndex/CIndexDiagnostic.h
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+++ b/tools/CIndex/CIndexDiagnostic.h
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+/*===-- CIndexDiagnostic.h - Diagnostics C Interface ------------*- C++ -*-===*\
+|*                                                                            *|
+|*                     The LLVM Compiler Infrastructure                       *|
+|*                                                                            *|
+|* This file is distributed under the University of Illinois Open Source      *|
+|* License. See LICENSE.TXT for details.                                      *|
+|*                                                                            *|
+|*===----------------------------------------------------------------------===*|
+|*                                                                            *|
+|* Implements the diagnostic functions of the Clang C interface.              *|
+|*                                                                            *|
+\*===----------------------------------------------------------------------===*/
+#ifndef LLVM_CLANG_CINDEX_DIAGNOSTIC_H
+#define LLVM_CLANG_CINDEX_DIAGNOSTIC_H
+
+#include "clang-c/Index.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/LangOptions.h"
+
+namespace llvm { namespace sys {
+class Path;
+} }
+
+namespace clang {
+
+class Diagnostic;
+class LangOptions;
+class Preprocessor;
+  
+/**
+ * \brief Diagnostic client that translates Clang diagnostics into diagnostics
+ * for the C interface to Clang.
+ */
+class CIndexDiagnosticClient : public DiagnosticClient {
+  CXDiagnosticCallback Callback;
+  CXClientData ClientData;
+  const LangOptions *LangOptsPtr;
+  
+public:
+  CIndexDiagnosticClient(CXDiagnosticCallback Callback,
+                         CXClientData ClientData)
+    : Callback(Callback), ClientData(ClientData), LangOptsPtr(0) { }
+  
+  virtual ~CIndexDiagnosticClient();
+  
+  virtual void BeginSourceFile(const LangOptions &LangOpts,
+                               const Preprocessor *PP);
+  
+  virtual void EndSourceFile();
+
+  virtual void HandleDiagnostic(Diagnostic::Level DiagLevel,
+                                const DiagnosticInfo &Info);
+};
+
+/// \brief Given the path to a file that contains binary, serialized
+/// diagnostics produced by Clang, emit those diagnostics via the
+/// given diagnostic engine.
+void ReportSerializedDiagnostics(const llvm::sys::Path &DiagnosticsPath,
+                                 Diagnostic &Diags,
+                                 unsigned num_unsaved_files,
+                                 struct CXUnsavedFile *unsaved_files,
+                                 const LangOptions &LangOpts);
+
+} // end namespace clang
+
+#endif // LLVM_CLANG_CINDEX_DIAGNOSTIC_H