diff --git a/include/clang/Basic/AllDiagnostics.h b/include/clang/Basic/AllDiagnostics.h
new file mode 100644
index 0000000..7e77435
--- /dev/null
+++ b/include/clang/Basic/AllDiagnostics.h
@@ -0,0 +1,39 @@
+//===--- AllDiagnostics.h - Aggregate Diagnostic headers --------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file includes all the separate Diagnostic headers & some related
+//  helpers.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_ALL_DIAGNOSTICS_H
+#define LLVM_CLANG_ALL_DIAGNOSTICS_H
+
+#include "clang/AST/ASTDiagnostic.h"
+#include "clang/Analysis/AnalysisDiagnostic.h"
+#include "clang/Driver/DriverDiagnostic.h"
+#include "clang/Frontend/FrontendDiagnostic.h"
+#include "clang/Lex/LexDiagnostic.h"
+#include "clang/Parse/ParseDiagnostic.h"
+#include "clang/Sema/SemaDiagnostic.h"
+#include "clang/Serialization/SerializationDiagnostic.h"
+
+namespace clang {
+template <size_t SizeOfStr, typename FieldType>
+class StringSizerHelper {
+  char FIELD_TOO_SMALL[SizeOfStr <= FieldType(~0U) ? 1 : -1];
+public:
+  enum { Size = SizeOfStr };
+};
+} // end namespace clang 
+
+#define STR_SIZE(str, fieldTy) clang::StringSizerHelper<sizeof(str)-1, \
+                                                        fieldTy>::Size 
+
+#endif
diff --git a/lib/Basic/DiagnosticIDs.cpp b/lib/Basic/DiagnosticIDs.cpp
index 754d7c0..eaa6075 100644
--- a/lib/Basic/DiagnosticIDs.cpp
+++ b/lib/Basic/DiagnosticIDs.cpp
@@ -11,17 +11,10 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "clang/AST/ASTDiagnostic.h"
-#include "clang/Analysis/AnalysisDiagnostic.h"
 #include "clang/Basic/DiagnosticIDs.h"
+#include "clang/Basic/AllDiagnostics.h"
 #include "clang/Basic/DiagnosticCategories.h"
 #include "clang/Basic/SourceManager.h"
-#include "clang/Driver/DriverDiagnostic.h"
-#include "clang/Frontend/FrontendDiagnostic.h"
-#include "clang/Lex/LexDiagnostic.h"
-#include "clang/Parse/ParseDiagnostic.h"
-#include "clang/Sema/SemaDiagnostic.h"
-#include "clang/Serialization/SerializationDiagnostic.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/Support/ErrorHandling.h"
 
@@ -73,17 +66,8 @@ struct StaticDiagInfoRec {
   }
 };
 
-template <size_t SizeOfStr, typename FieldType>
-class StringSizerHelper {
-  char FIELD_TOO_SMALL[SizeOfStr <= FieldType(~0U) ? 1 : -1];
-public:
-  enum { Size = SizeOfStr };
-};
-
 } // namespace anonymous
 
-#define STR_SIZE(str, fieldTy) StringSizerHelper<sizeof(str)-1, fieldTy>::Size 
-
 static const StaticDiagInfoRec StaticDiagInfo[] = {
 #define DIAG(ENUM,CLASS,DEFAULT_MAPPING,DESC,GROUP,               \
              SFINAE,ACCESS,NOWERROR,SHOWINSYSHEADER,              \
diff --git a/tools/diagtool/ListWarnings.cpp b/tools/diagtool/ListWarnings.cpp
index 85720b1..2bbeca8 100644
--- a/tools/diagtool/ListWarnings.cpp
+++ b/tools/diagtool/ListWarnings.cpp
@@ -17,13 +17,7 @@
 #include "llvm/Support/Format.h"
 #include "llvm/ADT/StringMap.h"
 #include "clang/AST/ASTDiagnostic.h"
-#include "clang/Analysis/AnalysisDiagnostic.h"
-#include "clang/Driver/DriverDiagnostic.h"
-#include "clang/Frontend/FrontendDiagnostic.h"
-#include "clang/Lex/LexDiagnostic.h"
-#include "clang/Parse/ParseDiagnostic.h"
-#include "clang/Sema/SemaDiagnostic.h"
-#include "clang/Serialization/SerializationDiagnostic.h"
+#include "clang/Basic/AllDiagnostics.h"
 
 DEF_DIAGTOOL("list-warnings",
              "List warnings and their corresponding flags",
@@ -32,18 +26,6 @@ DEF_DIAGTOOL("list-warnings",
 using namespace clang;
 
 namespace {
-template <size_t SizeOfStr, typename FieldType>
-class StringSizerHelper {
-  char FIELD_TOO_SMALL[SizeOfStr <= FieldType(~0U) ? 1 : -1];
-public:
-  enum { Size = SizeOfStr };
-};
-
-} // namespace anonymous
-
-#define STR_SIZE(str, fieldTy) StringSizerHelper<sizeof(str)-1, fieldTy>::Size 
-
-namespace {
 struct StaticDiagNameIndexRec {
   const char *NameStr;
   unsigned short DiagID;