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diff --git a/include/clang/Basic/Diagnostic.td b/include/clang/Basic/Diagnostic.td
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+//===--- Diagnostic.td - C Language Family Diagnostic Handling ------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file defines the TableGen core definitions for the diagnostics
+//  and diagnostic control.
+//
+//===----------------------------------------------------------------------===//
+
+// Define the diagnostic mappings.
+class DiagMapping;
+def MAP_IGNORE  : DiagMapping;
+def MAP_WARNING : DiagMapping;
+def MAP_ERROR   : DiagMapping;
+def MAP_FATAL   : DiagMapping;
+
+// Define the diagnostic classes.
+class DiagClass;
+def CLASS_NOTE      : DiagClass;
+def CLASS_WARNING   : DiagClass;
+def CLASS_EXTENSION : DiagClass;
+def CLASS_ERROR     : DiagClass;
+
+// Diagnostic Groups.
+class DiagGroup<string Name, list<DiagGroup> subgroups = []> {
+  string GroupName = Name;
+  list<DiagGroup> SubGroups = subgroups;
+}
+class InGroup<DiagGroup G> { DiagGroup Group = G; }
+//class IsGroup<string Name> { DiagGroup Group = DiagGroup<Name>; }
+
+
+// This defines the diagnostic groups that have references to them.
+include "DiagnosticGroups.td"
+
+
+// All diagnostics emitted by the compiler are an indirect subclass of this.
+class Diagnostic<string text, DiagClass DC, DiagMapping defaultmapping> {
+  /// Component is specified by the file with a big let directive.
+  string      Component = ?;
+  string      Text = text;
+  DiagClass   Class = DC;
+  DiagMapping DefaultMapping = defaultmapping;
+  DiagGroup   Group;
+}
+
+class Error<string str>     : Diagnostic<str, CLASS_ERROR, MAP_ERROR>;
+class Warning<string str>   : Diagnostic<str, CLASS_WARNING, MAP_WARNING>;
+class Extension<string str> : Diagnostic<str, CLASS_EXTENSION, MAP_IGNORE>;
+class ExtWarn<string str>   : Diagnostic<str, CLASS_EXTENSION, MAP_WARNING>;
+class Note<string str>      : Diagnostic<str, CLASS_NOTE, MAP_FATAL/*ignored*/>;
+
+
+class DefaultIgnore { DiagMapping DefaultMapping = MAP_IGNORE; }
+class DefaultWarn   { DiagMapping DefaultMapping = MAP_WARNING; }
+class DefaultError  { DiagMapping DefaultMapping = MAP_ERROR; }
+class DefaultFatal  { DiagMapping DefaultMapping = MAP_FATAL; }
+
+// Definitions for Diagnostics.
+include "DiagnosticASTKinds.td"
+include "DiagnosticAnalysisKinds.td"
+include "DiagnosticCommonKinds.td"
+include "DiagnosticDriverKinds.td"
+include "DiagnosticFrontendKinds.td"
+include "DiagnosticLexKinds.td"
+include "DiagnosticParseKinds.td"
+include "DiagnosticSemaKinds.td"
+