Author: Baranov Victor
Date: 2026-08-04T16:30:03+03:00
New Revision: d4c991d34c8c8568c6f81402b88c3fd37722c1db

URL: 
https://github.com/llvm/llvm-project/commit/d4c991d34c8c8568c6f81402b88c3fd37722c1db
DIFF: 
https://github.com/llvm/llvm-project/commit/d4c991d34c8c8568c6f81402b88c3fd37722c1db.diff

LOG: [clang-tidy][NFC] Apply const-correctness for auto 1/N (#213839)

Added: 
    

Modified: 
    clang-tools-extra/clang-tidy/ClangTidy.cpp
    clang-tools-extra/clang-tidy/ClangTidyCheck.cpp
    clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.cpp
    clang-tools-extra/clang-tidy/ClangTidyOptions.cpp
    clang-tools-extra/clang-tidy/GlobList.cpp
    clang-tools-extra/clang-tidy/NoLintDirectiveHandler.cpp
    clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp
    clang-tools-extra/clang-tidy/utils/CheckUtils.h
    clang-tools-extra/clang-tidy/utils/DeclRefExprUtils.cpp
    clang-tools-extra/clang-tidy/utils/ExceptionAnalyzer.cpp
    clang-tools-extra/clang-tidy/utils/FixItHintUtils.cpp
    clang-tools-extra/clang-tidy/utils/IncludeSorter.cpp
    clang-tools-extra/clang-tidy/utils/NamespaceAliaser.cpp
    clang-tools-extra/clang-tidy/utils/RenamerClangTidyCheck.cpp
    clang-tools-extra/clang-tidy/utils/TransformerClangTidyCheck.cpp
    clang-tools-extra/clang-tidy/utils/TypeTraits.cpp
    clang-tools-extra/clang-tidy/utils/UseRangesCheck.cpp
    clang-tools-extra/clang-tidy/utils/UsingInserter.cpp

Removed: 
    


################################################################################
diff  --git a/clang-tools-extra/clang-tidy/ClangTidy.cpp 
b/clang-tools-extra/clang-tidy/ClangTidy.cpp
index 24cbd0940226d..32e18645880e1 100644
--- a/clang-tools-extra/clang-tidy/ClangTidy.cpp
+++ b/clang-tools-extra/clang-tidy/ClangTidy.cpp
@@ -134,8 +134,9 @@ class ErrorReporter {
         Level = DiagnosticsEngine::Error;
         WarningsAsErrors++;
       }
-      auto Diag = Diags.Report(Loc, Diags.getCustomDiagID(Level, "%0 [%1]"))
-                  << Message.Message << Name;
+      const auto Diag =
+          Diags.Report(Loc, Diags.getCustomDiagID(Level, "%0 [%1]"))
+          << Message.Message << Name;
       for (const FileByteRange &FBR : Error.Message.Ranges)
         Diag << getRange(FBR);
       // FIXME: explore options to support interactive fix selection.
@@ -187,7 +188,7 @@ class ErrorReporter {
       }
       reportFix(Diag, Error.Message.Fix);
     }
-    for (auto Fix : FixLocations) {
+    for (const auto Fix : FixLocations) {
       Diags.Report(Fix.first, Fix.second ? diag::note_fixit_applied
                                          : diag::note_fixit_failed);
     }
@@ -289,7 +290,7 @@ class ErrorReporter {
   void reportNote(const tooling::DiagnosticMessage &Message) {
     const SourceLocation Loc =
         getLocation(Message.FilePath, Message.FileOffset);
-    auto Diag =
+    const auto Diag =
         Diags.Report(Loc, Diags.getCustomDiagID(DiagnosticsEngine::Note, "%0"))
         << Message.Message;
     for (const FileByteRange &FBR : Message.Ranges)

diff  --git a/clang-tools-extra/clang-tidy/ClangTidyCheck.cpp 
b/clang-tools-extra/clang-tidy/ClangTidyCheck.cpp
index 26c4234c1b0ee..64fbac524adae 100644
--- a/clang-tools-extra/clang-tidy/ClangTidyCheck.cpp
+++ b/clang-tools-extra/clang-tidy/ClangTidyCheck.cpp
@@ -84,7 +84,8 @@ findPriorityOption(const ClangTidyOptions::OptionMap &Options,
 
 std::optional<StringRef>
 ClangTidyCheck::OptionsView::getLocalOrGlobal(StringRef LocalName) const {
-  auto Iter = findPriorityOption(CheckOptions, NamePrefix, LocalName, Context);
+  const auto Iter =
+      findPriorityOption(CheckOptions, NamePrefix, LocalName, Context);
   if (Iter != CheckOptions.end())
     return StringRef(Iter->getValue().Value);
   return std::nullopt;
@@ -115,7 +116,8 @@ ClangTidyCheck::OptionsView::get<bool>(StringRef LocalName) 
const {
 template <>
 std::optional<bool>
 ClangTidyCheck::OptionsView::getLocalOrGlobal<bool>(StringRef LocalName) const 
{
-  auto Iter = findPriorityOption(CheckOptions, NamePrefix, LocalName, Context);
+  const auto Iter =
+      findPriorityOption(CheckOptions, NamePrefix, LocalName, Context);
   if (Iter != CheckOptions.end()) {
     if (auto Result = getAsBool(Iter->getValue().Value))
       return Result;
@@ -155,9 +157,10 @@ ClangTidyCheck::OptionsView::getEnumInt(StringRef 
LocalName,
                                         bool CheckGlobal) const {
   if (!CheckGlobal && Context->getOptionsCollector())
     Context->getOptionsCollector()->insert((NamePrefix + LocalName).str());
-  auto Iter = CheckGlobal ? findPriorityOption(CheckOptions, NamePrefix,
-                                               LocalName, Context)
-                          : CheckOptions.find((NamePrefix + LocalName).str());
+  const auto Iter =
+      CheckGlobal
+          ? findPriorityOption(CheckOptions, NamePrefix, LocalName, Context)
+          : CheckOptions.find((NamePrefix + LocalName).str());
   if (Iter == CheckOptions.end())
     return std::nullopt;
 
@@ -207,8 +210,8 @@ void ClangTidyCheck::OptionsView::diagnoseBadIntegerOption(
 void ClangTidyCheck::OptionsView::diagnoseBadEnumOption(
     const Twine &Lookup, StringRef Unparsed, StringRef Suggestion) const {
   SmallString<64> Buffer;
-  auto Diag = Context->configurationDiag(ConfigWarning)
-              << Unparsed << Lookup.toStringRef(Buffer);
+  const auto Diag = Context->configurationDiag(ConfigWarning)
+                    << Unparsed << Lookup.toStringRef(Buffer);
   if (Suggestion.empty())
     Diag << 0;
   else

diff  --git a/clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.cpp 
b/clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.cpp
index 88d0a433bc7fb..48d8c76bd4db6 100644
--- a/clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.cpp
+++ b/clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.cpp
@@ -64,7 +64,7 @@ class ClangTidyDiagnosticRenderer : public DiagnosticRenderer 
{
     const std::string CheckNameInMessage = " [" + Error.DiagnosticName + "]";
     Message.consume_back(CheckNameInMessage);
 
-    auto TidyMessage =
+    const auto TidyMessage =
         Loc.isValid()
             ? tooling::DiagnosticMessage(Message, Loc.getManager(), Loc)
             : tooling::DiagnosticMessage(Message);
@@ -73,7 +73,7 @@ class ClangTidyDiagnosticRenderer : public DiagnosticRenderer 
{
     // into a real CharRange for the diagnostic printer later.
     // Whatever we store here gets decoupled from the current SourceManager, so
     // we **have to** know the exact position and length of the highlight.
-    auto ToCharRange = [this, &Loc](const CharSourceRange &SourceRange) {
+    const auto ToCharRange = [this, &Loc](const CharSourceRange &SourceRange) {
       if (SourceRange.isCharRange())
         return SourceRange;
       assert(SourceRange.isTokenRange());
@@ -83,7 +83,7 @@ class ClangTidyDiagnosticRenderer : public DiagnosticRenderer 
{
     };
 
     // We are only interested in valid ranges.
-    auto ValidRanges =
+    const auto ValidRanges =
         llvm::make_filter_range(Ranges, [](const CharSourceRange &R) {
           return R.getAsRange().isValid();
         });
@@ -499,17 +499,18 @@ bool 
ClangTidyDiagnosticConsumer::passesLineFilter(StringRef FileName,
 
 void ClangTidyDiagnosticConsumer::forwardDiagnostic(const Diagnostic &Info) {
   // Acquire a diagnostic ID also in the external diagnostics engine.
-  auto DiagLevelAndFormatString =
+  const auto DiagLevelAndFormatString =
       Context.getDiagLevelAndFormatString(Info.getID(), Info.getLocation());
   const unsigned ExternalID =
       ExternalDiagEngine->getDiagnosticIDs()->getCustomDiagID(
           DiagLevelAndFormatString.first, DiagLevelAndFormatString.second);
 
   // Forward the details.
-  auto Builder = ExternalDiagEngine->Report(Info.getLocation(), ExternalID);
+  const auto Builder =
+      ExternalDiagEngine->Report(Info.getLocation(), ExternalID);
   for (const FixItHint &Hint : Info.getFixItHints())
     Builder << Hint;
-  for (auto Range : Info.getRanges())
+  for (const auto Range : Info.getRanges())
     Builder << Range;
   for (unsigned Index = 0; Index < Info.getNumArgs(); ++Index) {
     const DiagnosticsEngine::ArgumentKind Kind = Info.getArgKind(Index);

diff  --git a/clang-tools-extra/clang-tidy/ClangTidyOptions.cpp 
b/clang-tools-extra/clang-tidy/ClangTidyOptions.cpp
index 0a0f392346f6d..2ef23ede09972 100644
--- a/clang-tools-extra/clang-tidy/ClangTidyOptions.cpp
+++ b/clang-tools-extra/clang-tidy/ClangTidyOptions.cpp
@@ -113,7 +113,7 @@ void yamlize(IO &IO, ClangTidyOptions::OptionMap &Val, bool,
   } else {
     // We need custom logic here to support the old method of specifying check
     // options using a list of maps containing key and value keys.
-    auto &I = reinterpret_cast<Input &>(IO);
+    const auto &I = reinterpret_cast<Input &>(IO);
     if (isa<SequenceNode>(I.getCurrentNode())) {
       MappingNormalization<NOptionMap, ClangTidyOptions::OptionMap> NOpts(IO,
                                                                           Val);
@@ -194,7 +194,7 @@ void yamlize(IO &IO, GlobListVariant &Val, bool, 
EmptyContext &Ctx) {
   if (!IO.outputting()) {
     // Special case for reading from YAML
     // Must support reading from both a string or a list
-    auto &I = reinterpret_cast<Input &>(IO);
+    const auto &I = reinterpret_cast<Input &>(IO);
     if (isa<ScalarNode, BlockScalarNode>(I.getCurrentNode())) {
       Val.AsString = std::string();
       yamlize(IO, *Val.AsString, true, Ctx);
@@ -327,7 +327,7 @@ ClangTidyOptions ClangTidyOptions::merge(const 
ClangTidyOptions &Other,
 ClangTidyOptions ClangTidyOptionsProvider::getOptions(StringRef FileName) {
   ClangTidyOptions Result;
   unsigned Priority = 0;
-  for (auto &Source : getRawOptions(FileName))
+  for (const auto &Source : getRawOptions(FileName))
     Result.mergeWith(Source.first, ++Priority);
   return Result;
 }
@@ -402,11 +402,11 @@ 
FileOptionsBaseProvider::getNormalizedAbsolutePath(StringRef Path) {
 
 void FileOptionsBaseProvider::addRawFileOptions(
     StringRef AbsolutePath, std::vector<OptionsSource> &CurOptions) {
-  auto CurSize = CurOptions.size();
+  const auto CurSize = CurOptions.size();
   // Look for a suitable configuration file in all parent directories of the
   // file. Start with the immediate parent directory and move up.
   StringRef RootPath = llvm::sys::path::parent_path(AbsolutePath);
-  auto MemorizedConfigFile =
+  const auto MemorizedConfigFile =
       [this, &RootPath](StringRef CurrentPath) -> std::optional<OptionsSource> 
{
     const auto Iter = CachedOptions.Memorized.find(CurrentPath);
     if (Iter != CachedOptions.Memorized.end())

diff  --git a/clang-tools-extra/clang-tidy/GlobList.cpp 
b/clang-tools-extra/clang-tidy/GlobList.cpp
index 442322f68fdb3..bf57ea6009ba2 100644
--- a/clang-tools-extra/clang-tidy/GlobList.cpp
+++ b/clang-tools-extra/clang-tidy/GlobList.cpp
@@ -66,7 +66,7 @@ bool GlobList::contains(StringRef S) const {
 }
 
 bool CachedGlobList::contains(StringRef S) const {
-  auto Entry = Cache.try_emplace(S);
+  const auto Entry = Cache.try_emplace(S);
   bool &Value = Entry.first->getValue();
   // If the entry was just inserted, determine its required value.
   if (Entry.second)

diff  --git a/clang-tools-extra/clang-tidy/NoLintDirectiveHandler.cpp 
b/clang-tools-extra/clang-tidy/NoLintDirectiveHandler.cpp
index 0d9a59bc725cb..f67d19be4525c 100644
--- a/clang-tools-extra/clang-tidy/NoLintDirectiveHandler.cpp
+++ b/clang-tools-extra/clang-tidy/NoLintDirectiveHandler.cpp
@@ -357,13 +357,13 @@ bool NoLintDirectiveHandler::Impl::diagHasNoLint(
     return false;
 
   // Check if there's a NOLINT on this line.
-  auto ThisLine = getLineStartAndEnd(*Buffer, Pos);
+  const auto ThisLine = getLineStartAndEnd(*Buffer, Pos);
   if (lineHasNoLint(*Buffer, ThisLine, NoLintType::NoLint, DiagName))
     return true;
 
   // Check if there's a NOLINTNEXTLINE on the previous line.
   if (ThisLine.first > 0) {
-    auto PrevLine = getLineStartAndEnd(*Buffer, ThisLine.first - 1);
+    const auto PrevLine = getLineStartAndEnd(*Buffer, ThisLine.first - 1);
     if (lineHasNoLint(*Buffer, PrevLine, NoLintType::NoLintNextLine, DiagName))
       return true;
   }

diff  --git a/clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp 
b/clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp
index 949a88f0fd50d..7ee556fa7c51f 100644
--- a/clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp
+++ b/clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp
@@ -436,7 +436,7 @@ 
createOptionsProvider(llvm::IntrusiveRefCntPtr<vfs::FileSystem> FS) {
   if (RemovedArgs.getNumOccurrences() > 0)
     OverrideOptions.RemovedArgs = RemovedArgs;
 
-  auto LoadConfig =
+  const auto LoadConfig =
       [&](StringRef Configuration,
           StringRef Source) -> std::unique_ptr<ClangTidyOptionsProvider> {
     llvm::ErrorOr<ClangTidyOptions> ParsedConfig =
@@ -501,7 +501,7 @@ getVfsFromFile(const std::string &OverlayFile, 
vfs::FileSystem &BaseFS) {
 static StringRef closest(StringRef Value, const StringSet<> &Allowed) {
   unsigned MaxEdit = 5U;
   StringRef Closest;
-  for (auto Item : Allowed.keys()) {
+  for (const auto Item : Allowed.keys()) {
     const unsigned Cur = Value.edit_distance_insensitive(Item, true, MaxEdit);
     if (Cur < MaxEdit) {
       Closest = Item;
@@ -565,7 +565,7 @@ static bool verifyOptions(const llvm::StringSet<> 
&ValidOptions,
                           const ClangTidyOptions::OptionMap &OptionMap,
                           StringRef Source) {
   bool AnyInvalid = false;
-  for (auto Key : OptionMap.keys()) {
+  for (const auto Key : OptionMap.keys()) {
     if (ValidOptions.contains(Key))
       continue;
     AnyInvalid = true;

diff  --git a/clang-tools-extra/clang-tidy/utils/CheckUtils.h 
b/clang-tools-extra/clang-tidy/utils/CheckUtils.h
index af4821ea13520..ea9d65dcb4a8d 100644
--- a/clang-tools-extra/clang-tidy/utils/CheckUtils.h
+++ b/clang-tools-extra/clang-tidy/utils/CheckUtils.h
@@ -7,7 +7,7 @@ namespace clang::tidy::utils {
 
 /// Emits a configuration diagnostic when a deprecated check alias is enabled
 /// and the canonical check name is not also enabled.
-inline void diagDeprecatedCheckAlias(ClangTidyCheck &Check,
+inline void diagDeprecatedCheckAlias(const ClangTidyCheck &Check,
                                      const ClangTidyContext &Context,
                                      StringRef DeprecatedName,
                                      StringRef CanonicalName) {

diff  --git a/clang-tools-extra/clang-tidy/utils/DeclRefExprUtils.cpp 
b/clang-tools-extra/clang-tidy/utils/DeclRefExprUtils.cpp
index 141df2b78cac8..586dc1d40af51 100644
--- a/clang-tools-extra/clang-tidy/utils/DeclRefExprUtils.cpp
+++ b/clang-tools-extra/clang-tidy/utils/DeclRefExprUtils.cpp
@@ -343,10 +343,11 @@ AST_MATCHER_P(DeclRefExpr, doesNotMutateObject, int, 
Indirections) {
 SmallPtrSet<const DeclRefExpr *, 16>
 constReferenceDeclRefExprs(const VarDecl &VarDecl, const Stmt &Stmt,
                            ASTContext &Context, int Indirections) {
-  auto Matches = match(findAll(declRefExpr(to(varDecl(equalsNode(&VarDecl))),
-                                           doesNotMutateObject(Indirections))
-                                   .bind("declRef")),
-                       Stmt, Context);
+  const auto Matches =
+      match(findAll(declRefExpr(to(varDecl(equalsNode(&VarDecl))),
+                                doesNotMutateObject(Indirections))
+                        .bind("declRef")),
+            Stmt, Context);
   SmallPtrSet<const DeclRefExpr *, 16> DeclRefs;
   extractNodesByIdTo(Matches, "declRef", DeclRefs);
 
@@ -360,8 +361,8 @@ bool isOnlyUsedAsConst(const VarDecl &Var, const Stmt &Stmt,
   // reference parameter.
   // If the 
diff erence is empty it is safe for the loop variable to be a const
   // reference.
-  auto AllDeclRefs = allDeclRefExprs(Var, Stmt, Context);
-  auto ConstReferenceDeclRefs =
+  const auto AllDeclRefs = allDeclRefExprs(Var, Stmt, Context);
+  const auto ConstReferenceDeclRefs =
       constReferenceDeclRefExprs(Var, Stmt, Context, Indirections);
   return isSetDifferenceEmpty(AllDeclRefs, ConstReferenceDeclRefs);
 }
@@ -369,7 +370,7 @@ bool isOnlyUsedAsConst(const VarDecl &Var, const Stmt &Stmt,
 SmallPtrSet<const DeclRefExpr *, 16> allDeclRefExprs(const ValueDecl 
&ValueDecl,
                                                      const Stmt &Stmt,
                                                      ASTContext &Context) {
-  auto Matches = match(
+  const auto Matches = match(
       findAll(
           declRefExpr(to(valueDecl(equalsNode(&ValueDecl)))).bind("declRef")),
       Stmt, Context);
@@ -381,7 +382,7 @@ SmallPtrSet<const DeclRefExpr *, 16> allDeclRefExprs(const 
ValueDecl &ValueDecl,
 SmallPtrSet<const DeclRefExpr *, 16> allDeclRefExprs(const ValueDecl 
&ValueDecl,
                                                      const Decl &Decl,
                                                      ASTContext &Context) {
-  auto Matches = match(
+  const auto Matches = match(
       decl(forEachDescendant(
           declRefExpr(to(valueDecl(equalsNode(&ValueDecl)))).bind("declRef"))),
       Decl, Context);
@@ -392,10 +393,10 @@ SmallPtrSet<const DeclRefExpr *, 16> 
allDeclRefExprs(const ValueDecl &ValueDecl,
 
 bool isCopyConstructorArgument(const DeclRefExpr &DeclRef, const Decl &Decl,
                                ASTContext &Context) {
-  auto UsedAsConstRefArg = forEachArgumentWithParam(
+  const auto UsedAsConstRefArg = forEachArgumentWithParam(
       declRefExpr(equalsNode(&DeclRef)),
       parmVarDecl(hasType(matchers::isReferenceToConst())));
-  auto Matches = match(
+  const auto Matches = match(
       decl(hasDescendant(
           cxxConstructExpr(UsedAsConstRefArg, 
hasDeclaration(cxxConstructorDecl(
                                                   isCopyConstructor())))
@@ -406,10 +407,10 @@ bool isCopyConstructorArgument(const DeclRefExpr 
&DeclRef, const Decl &Decl,
 
 bool isCopyAssignmentArgument(const DeclRefExpr &DeclRef, const Decl &Decl,
                               ASTContext &Context) {
-  auto UsedAsConstRefArg = forEachArgumentWithParam(
+  const auto UsedAsConstRefArg = forEachArgumentWithParam(
       declRefExpr(equalsNode(&DeclRef)),
       parmVarDecl(hasType(matchers::isReferenceToConst())));
-  auto Matches = match(
+  const auto Matches = match(
       decl(hasDescendant(
           cxxOperatorCallExpr(UsedAsConstRefArg, 
hasOverloadedOperatorName("="),
                               
callee(cxxMethodDecl(isCopyAssignmentOperator())))

diff  --git a/clang-tools-extra/clang-tidy/utils/ExceptionAnalyzer.cpp 
b/clang-tools-extra/clang-tidy/utils/ExceptionAnalyzer.cpp
index af18fda7a3a54..08deb6a35e55b 100644
--- a/clang-tools-extra/clang-tidy/utils/ExceptionAnalyzer.cpp
+++ b/clang-tools-extra/clang-tidy/utils/ExceptionAnalyzer.cpp
@@ -253,8 +253,8 @@ static bool isQualificationConvertiblePointer(QualType 
From, QualType To,
 
   int I = 0;
   bool ConstUntilI = true;
-  auto SatisfiesCVRules = [&I, &ConstUntilI](const QualType &From,
-                                             const QualType &To) {
+  const auto SatisfiesCVRules = [&I, &ConstUntilI](const QualType &From,
+                                                   const QualType &To) {
     if (I > 1) {
       if (From.getQualifiers() != To.getQualifiers() && !ConstUntilI)
         return false;

diff  --git a/clang-tools-extra/clang-tidy/utils/FixItHintUtils.cpp 
b/clang-tools-extra/clang-tidy/utils/FixItHintUtils.cpp
index 9624148411eac..e013742fe6901 100644
--- a/clang-tools-extra/clang-tidy/utils/FixItHintUtils.cpp
+++ b/clang-tools-extra/clang-tidy/utils/FixItHintUtils.cpp
@@ -52,7 +52,7 @@ skipLParensBackwards(SourceLocation Start, const ASTContext 
&Context) {
   if (locDangerous(Start))
     return std::nullopt;
 
-  auto PreviousTokenLParen = [&Start, &Context]() {
+  const auto PreviousTokenLParen = [&Start, &Context]() {
     const std::optional<Token> T = lexer::getPreviousToken(
         Start, Context.getSourceManager(), Context.getLangOpts());
     return T && T->is(tok::l_paren);

diff  --git a/clang-tools-extra/clang-tidy/utils/IncludeSorter.cpp 
b/clang-tools-extra/clang-tidy/utils/IncludeSorter.cpp
index f4ab9124cfca1..f87a393f071f3 100644
--- a/clang-tools-extra/clang-tidy/utils/IncludeSorter.cpp
+++ b/clang-tools-extra/clang-tidy/utils/IncludeSorter.cpp
@@ -164,7 +164,7 @@ IncludeSorter::createIncludeInsertion(StringRef FileName, 
bool IsAngled) {
         SourceMgr->getLocForStartOfFile(CurrentFileID), IncludeStmt);
   }
 
-  auto IncludeKind =
+  const auto IncludeKind =
       determineIncludeKind(CanonicalFile, FileName, IsAngled, Style);
 
   if (!IncludeBucket[IncludeKind].empty()) {

diff  --git a/clang-tools-extra/clang-tidy/utils/NamespaceAliaser.cpp 
b/clang-tools-extra/clang-tidy/utils/NamespaceAliaser.cpp
index e039965a68253..8aa47e452cc61 100644
--- a/clang-tools-extra/clang-tidy/utils/NamespaceAliaser.cpp
+++ b/clang-tools-extra/clang-tidy/utils/NamespaceAliaser.cpp
@@ -82,7 +82,7 @@ std::string NamespaceAliaser::getNamespaceName(ASTContext 
&Context,
                                                const Stmt &Statement,
                                                StringRef Namespace) const {
   const auto *Function = getSurroundingFunction(Context, Statement);
-  auto FunctionAliases = AddedAliases.find(Function);
+  const auto FunctionAliases = AddedAliases.find(Function);
   if (FunctionAliases != AddedAliases.end()) {
     if (FunctionAliases->second.contains(Namespace))
       return FunctionAliases->second.find(Namespace)->getValue();

diff  --git a/clang-tools-extra/clang-tidy/utils/RenamerClangTidyCheck.cpp 
b/clang-tools-extra/clang-tidy/utils/RenamerClangTidyCheck.cpp
index bfdcd381b4122..c9ff8f9be754a 100644
--- a/clang-tools-extra/clang-tidy/utils/RenamerClangTidyCheck.cpp
+++ b/clang-tools-extra/clang-tidy/utils/RenamerClangTidyCheck.cpp
@@ -136,7 +136,7 @@ static NameLookup findDeclInBases(const CXXRecordDecl 
&Parent,
   const auto *Definition = Parent.getDefinition();
   if (!Visited.insert(Definition).second)
     return NameLookup(nullptr);
-  auto RemoveFromVisited =
+  const auto RemoveFromVisited =
       llvm::scope_exit([&Visited, Definition] { Visited.erase(Definition); });
 
   if (const NamedDecl *InClassRef = findDecl(Parent, DeclName))
@@ -155,8 +155,8 @@ static NameLookup findDeclInBases(const CXXRecordDecl 
&Parent,
     }
     if (!Record)
       continue;
-    if (auto Search = findDeclInBases(*Record, DeclName,
-                                      AggressiveTemplateLookup, Visited)) {
+    if (const auto Search = findDeclInBases(
+            *Record, DeclName, AggressiveTemplateLookup, Visited)) {
       if (*Search) {
         if (Found)
           return NameLookup(
@@ -493,7 +493,7 @@ void RenamerClangTidyCheck::addUsage(const NamedDecl *Decl,
   if (!Failure.shouldFix())
     return;
   const IdentifierTable &Idents = FailureDecl->getASTContext().Idents;
-  auto CheckNewIdentifier = Idents.find(Failure.Info.Fixup);
+  const auto CheckNewIdentifier = Idents.find(Failure.Info.Fixup);
   if (CheckNewIdentifier != Idents.end()) {
     const IdentifierInfo *Ident = CheckNewIdentifier->second;
     if (Ident->isKeyword(getLangOpts()))
@@ -543,7 +543,7 @@ void RenamerClangTidyCheck::expandMacro(const Token 
&MacroNameTok,
   const StringRef Name = MacroNameTok.getIdentifierInfo()->getName();
   const NamingCheckId ID(MI->getDefinitionLoc(), Name);
 
-  auto Failure = NamingCheckFailures.find(ID);
+  const auto Failure = NamingCheckFailures.find(ID);
   if (Failure == NamingCheckFailures.end())
     return;
 

diff  --git a/clang-tools-extra/clang-tidy/utils/TransformerClangTidyCheck.cpp 
b/clang-tools-extra/clang-tidy/utils/TransformerClangTidyCheck.cpp
index 6fa623022ee9c..2b682091d967a 100644
--- a/clang-tools-extra/clang-tidy/utils/TransformerClangTidyCheck.cpp
+++ b/clang-tools-extra/clang-tidy/utils/TransformerClangTidyCheck.cpp
@@ -43,7 +43,7 @@ static std::string escapeForDiagnostic(std::string ToEscape) {
   Result.append(ToEscape, 0, Pos);
   Result += '%';
 
-  for (auto N = ToEscape.size(); Pos < N; ++Pos) {
+  for (const auto N = ToEscape.size(); Pos < N; ++Pos) {
     const char C = ToEscape.at(Pos);
     Result += C;
     if (C == '%')
@@ -95,7 +95,7 @@ void TransformerClangTidyCheck::registerPPCallbacks(
 void TransformerClangTidyCheck::registerMatchers(
     ast_matchers::MatchFinder *Finder) {
   if (!Rule.Cases.empty())
-    for (auto &Matcher : transformer::detail::buildMatchers(Rule))
+    for (const auto &Matcher : transformer::detail::buildMatchers(Rule))
       Finder->addDynamicMatcher(Matcher, this);
 }
 

diff  --git a/clang-tools-extra/clang-tidy/utils/TypeTraits.cpp 
b/clang-tools-extra/clang-tidy/utils/TypeTraits.cpp
index 136a7b2ed26a8..ac2fcf72fef83 100644
--- a/clang-tools-extra/clang-tidy/utils/TypeTraits.cpp
+++ b/clang-tools-extra/clang-tidy/utils/TypeTraits.cpp
@@ -15,14 +15,14 @@
 namespace clang::tidy::utils::type_traits {
 
 static bool classHasTrivialCopyAndDestroy(QualType Type) {
-  auto *Record = Type->getAsCXXRecordDecl();
+  const auto *Record = Type->getAsCXXRecordDecl();
   return Record && Record->hasDefinition() &&
          !Record->hasNonTrivialCopyConstructor() &&
          !Record->hasNonTrivialDestructor();
 }
 
 static bool hasDeletedCopyConstructor(QualType Type) {
-  auto *Record = Type->getAsCXXRecordDecl();
+  const auto *Record = Type->getAsCXXRecordDecl();
   if (!Record || !Record->hasDefinition())
     return false;
   return llvm::any_of(Record->ctors(), [](const auto *Constructor) {
@@ -136,13 +136,13 @@ bool isTriviallyDestructible(QualType Type) {
 }
 
 bool hasNonTrivialMoveConstructor(QualType Type) {
-  auto *Record = Type->getAsCXXRecordDecl();
+  const auto *Record = Type->getAsCXXRecordDecl();
   return Record && Record->hasDefinition() &&
          Record->hasNonTrivialMoveConstructor();
 }
 
 bool hasNonTrivialMoveAssignment(QualType Type) {
-  auto *Record = Type->getAsCXXRecordDecl();
+  const auto *Record = Type->getAsCXXRecordDecl();
   return Record && Record->hasDefinition() &&
          Record->hasNonTrivialMoveAssignment();
 }

diff  --git a/clang-tools-extra/clang-tidy/utils/UseRangesCheck.cpp 
b/clang-tools-extra/clang-tidy/utils/UseRangesCheck.cpp
index 1dc0376509054..e66e1e541e461 100644
--- a/clang-tools-extra/clang-tidy/utils/UseRangesCheck.cpp
+++ b/clang-tools-extra/clang-tidy/utils/UseRangesCheck.cpp
@@ -117,7 +117,7 @@ void UseRangesCheck::registerMatchers(MatchFinder *Finder) {
   Replacers.clear();
   llvm::DenseSet<Replacer *> SeenRepl;
   for (auto I = Replaces.begin(), E = Replaces.end(); I != E; ++I) {
-    auto Replacer = I->getValue();
+    const auto Replacer = I->getValue();
     if (!SeenRepl.insert(Replacer.get()).second)
       continue;
     Replacers.push_back(Replacer);
@@ -255,9 +255,9 @@ void UseRangesCheck::check(const MatchFinder::MatchResult 
&Result) {
     }
 
     const bool ResultUsed = isResultUsed(*Call, Result);
-    auto ResultPolicy = Replacer->getResultUsePolicy(*Function, false);
+    const auto ResultPolicy = Replacer->getResultUsePolicy(*Function, false);
 
-    auto Diag = createDiag(*Call);
+    const auto Diag = createDiag(*Call);
     if (auto ReplaceName = Replacer->getReplaceName(*Function))
       Diag << FixItHint::CreateReplacement(Call->getCallee()->getSourceRange(),
                                            *ReplaceName);

diff  --git a/clang-tools-extra/clang-tidy/utils/UsingInserter.cpp 
b/clang-tools-extra/clang-tidy/utils/UsingInserter.cpp
index 2040f42231118..f1bed2e53f075 100644
--- a/clang-tools-extra/clang-tidy/utils/UsingInserter.cpp
+++ b/clang-tools-extra/clang-tidy/utils/UsingInserter.cpp
@@ -57,7 +57,7 @@ std::optional<FixItHint> 
UsingInserter::createUsingDeclaration(
     return std::nullopt;
   }
   // Find conflicting declarations and references.
-  auto ConflictingDecl = namedDecl(hasName(UnqualifiedName));
+  const auto ConflictingDecl = namedDecl(hasName(UnqualifiedName));
   const bool HasConflictingDeclaration =
       !match(findAll(ConflictingDecl), *Function, Context).empty();
   const bool HasConflictingDeclRef =


        
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