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diff --git a/include/clang/Basic/DiagnosticGroups.td b/include/clang/Basic/DiagnosticGroups.td
new file mode 100644
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+++ b/include/clang/Basic/DiagnosticGroups.td
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+//==--- DiagnosticGroups.td - Diagnostic Group Definitions ----------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+def ImplicitFunctionDeclare : DiagGroup<"implicit-function-declaration">;
+def ImplicitInt : DiagGroup<"implicit-int">;
+
+// Aggregation warning settings.
+def Implicit : DiagGroup<"implicit", [
+    ImplicitFunctionDeclare,
+    ImplicitInt
+]>;
+    
+
+
+// Empty DiagGroups: these are recognized by clang but ignored.
+def : DiagGroup<"aggregate-return">;
+def : DiagGroup<"bad-function-cast">;
+def : DiagGroup<"cast-align">;
+def : DiagGroup<"cast-qual">;
+def : DiagGroup<"char-align">;
+def : DiagGroup<"char-subscripts">;
+def Comment : DiagGroup<"comment">;
+def : DiagGroup<"conversion">;
+def : DiagGroup<"declaration-after-statement">;
+def : DiagGroup<"disabled-optimization">;
+def : DiagGroup<"discard-qual">;
+def ExtraTokens : DiagGroup<"extra-tokens">;
+
+def FormatExtraArgs : DiagGroup<"format-extra-args">;
+def FormatZeroLength : DiagGroup<"format-zero-length">;
+
+def FourByteMultiChar : DiagGroup<"four-char-constants">;
+def : DiagGroup<"init-self">;
+def : DiagGroup<"inline">;
+def : DiagGroup<"int-to-pointer-cast">;
+def : DiagGroup<"missing-braces">;
+def : DiagGroup<"missing-declarations">;
+def : DiagGroup<"missing-format-attribute">;
+def : DiagGroup<"missing-noreturn">;
+def MultiChar : DiagGroup<"multichar">;
+def : DiagGroup<"nested-externs">;
+def : DiagGroup<"newline-eof">;
+def : DiagGroup<"long-long">;
+def MismatchedTags : DiagGroup<"mismatched-tags">;
+def : DiagGroup<"missing-field-initializers">;
+def NonNull : DiagGroup<"nonnull">;
+def : DiagGroup<"nonportable-cfstrings">;
+def : DiagGroup<"old-style-definition">;
+def : DiagGroup<"packed">;
+def Parentheses : DiagGroup<"parentheses">;
+def : DiagGroup<"pointer-arith">;
+def : DiagGroup<"pointer-to-int-cast">;
+def : DiagGroup<"redundant-decls">;
+def ReturnType : DiagGroup<"return-type">;
+def : DiagGroup<"sequence-point">;
+def : DiagGroup<"shadow">;
+def : DiagGroup<"shorten-64-to-32">;
+def : DiagGroup<"sign-compare">;
+
+// Just silence warnings about common forms of -Wstrict-aliasing for now.
+def : DiagGroup<"strict-aliasing=0">;
+def : DiagGroup<"strict-aliasing=1">;
+def : DiagGroup<"strict-aliasing=2">;
+def : DiagGroup<"strict-aliasing">;
+
+// Just silence warnings about common forms of -Wstrict-aliasing for now.
+def : DiagGroup<"strict-overflow=0">;
+def : DiagGroup<"strict-overflow=1">;
+def : DiagGroup<"strict-overflow=2">;
+def : DiagGroup<"strict-overflow">;
+
+def InvalidOffsetof : DiagGroup<"invalid-offsetof">;
+def : DiagGroup<"strict-prototypes">;
+def : DiagGroup<"strict-selector-match">;
+def Switch         : DiagGroup<"switch">;
+def Trigraphs : DiagGroup<"trigraphs">;
+
+def : DiagGroup<"type-limits">;
+def Uninitialized  : DiagGroup<"uninitialized">;
+def UnknownPragmas : DiagGroup<"unknown-pragmas">;
+def : DiagGroup<"unused-function">;
+def : DiagGroup<"unused-label">;
+def : DiagGroup<"unused-parameter">;
+def UnusedValue    : DiagGroup<"unused-value">;
+def UnusedVariable : DiagGroup<"unused-variable">;
+def : DiagGroup<"variadic-macros">;
+def VectorConversions : DiagGroup<"vector-conversions">;      // clang specific
+def VolatileRegisterVar : DiagGroup<"volatile-register-var">;
+def : DiagGroup<"write-strings">;
+
+// Aggregation warning settings.
+
+
+// Format settings.
+def Format : DiagGroup<"format", [FormatExtraArgs, FormatZeroLength, NonNull]>;
+def FormatSecurity : DiagGroup<"format-security", [Format]>;
+def FormatNonLiteral : DiagGroup<"format-nonliteral", [FormatSecurity]>;
+def FormatY2K : DiagGroup<"format-y2k", [Format]>;
+def Format2 : DiagGroup<"format=2",
+                        [FormatNonLiteral, FormatSecurity, FormatY2K]>;
+
+
+def Extra : DiagGroup<"extra">;
+
+def Most : DiagGroup<"most", [
+    Comment,
+    Format,
+    Implicit,
+    MismatchedTags,
+    MultiChar,
+    Switch,
+    Trigraphs,
+    Uninitialized,
+    UnknownPragmas,
+    UnusedValue,
+    UnusedVariable,
+    VectorConversions,
+    VolatileRegisterVar
+ ]>;
+
+// -Wall is -Wmost -Wparentheses
+def : DiagGroup<"all", [Most, Parentheses]>;
+
+// Aliases.
+def : DiagGroup<"", [Extra]>;  // -W = -Wextra
+def : DiagGroup<"endif-labels", [ExtraTokens]>; // endif-labels = endif-tokens
+