[clang-tidy] Add support for diagnostics with no location

[njames93]

Summary

Add methods for emitting diagnostics with no location as well as a special diagnostic for configuration errors.
These show up in the errors as [clang-tidy-config].
The reason to use a custom name rather than the check name is to distinguish the error isn't the same category as the check that reported it.

[njames93]

Fix unittest failing.

[aaron.ballman]

clang-tools-extra/clang-tidy/ClangTidyCheck.h

183

checks -> check's

clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.cpp

276

Perhaps this is a bad idea, but would it make sense to have isCheckEnabled() report true for clang-tidy-config? It's not really a check, so that's a bit odd, but it seems like anywhere we're testing this property we wouldn't want to ignore config issues?

clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.h

102

with reading configuration -> with reading the configuration

and add a full stop to the end of the comment.

[njames93]

clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.cpp

276

I didn't personally think that was a good way to go. This is the only real place its used where you would get isCheckEnabled called with clang-tidy-config.

[njames93]

Address comments.

[aaron.ballman]

LGTM!

clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.cpp

276

Okay, that's good enough for me, thank you!

clang-tools-extra/clang-tidy/ClangTidyCheck.h

public:
   /// ``ClangTidyChecks`` that register ASTMatchers should do the actual
   /// work in here.
   virtual void check(const ast_matchers::MatchFinder::MatchResult &Result) {}
 
   /// Add a diagnostic with the check's name.
   DiagnosticBuilder diag(SourceLocation Loc, StringRef Description,
                          DiagnosticIDs::Level Level = DiagnosticIDs::Warning);
 
+  /// Add a diagnostic with the check's name.
+  DiagnosticBuilder diag(StringRef Description,
+                         DiagnosticIDs::Level Level = DiagnosticIDs::Warning);
+
+  /// Adds a diagnostic to report errors in the checks configuration.
+  DiagnosticBuilder
+  configurationDiag(StringRef Description,
+                    DiagnosticIDs::Level Level = DiagnosticIDs::Warning);
+
   /// Should store all options supported by this check with their
   /// current values or default values for options that haven't been overridden.
   ///
   /// The check should use ``Options.store()`` to store each option it supports
   /// whether it has the default value or it has been overridden.
   virtual void storeOptions(ClangTidyOptions::OptionMap &Options) {}
 
   /// Provides access to the ``ClangTidyCheck`` options via check-local
   /// names.
   ///
   /// Methods of this class prepend ``CheckName + "."`` to translate check-local
   /// option names to global option names.
   class OptionsView {
   public:
     /// Initializes the instance using \p CheckName + "." as a prefix.
     OptionsView(StringRef CheckName,
-                const ClangTidyOptions::OptionMap &CheckOptions);
+                const ClangTidyOptions::OptionMap &CheckOptions,
+                ClangTidyContext *Context);
 
     /// Read a named option from the ``Context``.
     ///
     /// Reads the option with the check-local name \p LocalName from the
     /// ``CheckOptions``. If the corresponding key is not present, returns
     /// a ``MissingOptionError``.
     llvm::Expected<std::string> get(StringRef LocalName) const;
 
public:
     /// ``CheckOptions``. If the corresponding key is not present or it can't be
     /// parsed as a ``T``, returns \p Default.
     template <typename T>
     std::enable_if_t<std::is_integral<T>::value, T> get(StringRef LocalName,
                                                         T Default) const {
       if (llvm::Expected<T> ValueOr = get<T>(LocalName))
         return *ValueOr;
       else
-        logIfOptionParsingError(ValueOr.takeError());
+        reportOptionParsingError(ValueOr.takeError());
       return Default;
     }
 
     /// Read a named option from the ``Context`` and parse it as an
     /// integral type ``T``.
     ///
     /// Reads the option with the check-local name \p LocalName from local or
     /// global ``CheckOptions``. Gets local option first. If local is not
public:
     /// present, falls back to get global option. If global option is not
     /// present either or it can't be parsed as a ``T``, returns \p Default.
     template <typename T>
     std::enable_if_t<std::is_integral<T>::value, T>
     getLocalOrGlobal(StringRef LocalName, T Default) const {
       if (llvm::Expected<T> ValueOr = getLocalOrGlobal<T>(LocalName))
         return *ValueOr;
       else
-        logIfOptionParsingError(ValueOr.takeError());
+        reportOptionParsingError(ValueOr.takeError());
       return Default;
     }
 
     /// Read a named option from the ``Context`` and parse it as an
     /// enum type ``T``.
     ///
     /// Reads the option with the check-local name \p LocalName from the
     /// ``CheckOptions``. If the corresponding key is not present, returns a
public:
     /// \ref clang::tidy::OptionEnumMapping must be specialized for ``T`` to
     /// supply the mapping required to convert between ``T`` and a string.
     template <typename T>
     std::enable_if_t<std::is_enum<T>::value, T>
     get(StringRef LocalName, T Default, bool IgnoreCase = false) const {
       if (auto ValueOr = get<T>(LocalName, IgnoreCase))
         return *ValueOr;
       else
-        logIfOptionParsingError(ValueOr.takeError());
+        reportOptionParsingError(ValueOr.takeError());
       return Default;
     }
 
     /// Read a named option from the ``Context`` and parse it as an
     /// enum type ``T``.
     ///
     /// Reads the option with the check-local name \p LocalName from local or
     /// global ``CheckOptions``. Gets local option first. If local is not
public:
     /// supply the mapping required to convert between ``T`` and a string.
     template <typename T>
     std::enable_if_t<std::is_enum<T>::value, T>
     getLocalOrGlobal(StringRef LocalName, T Default,
                      bool IgnoreCase = false) const {
       if (auto ValueOr = getLocalOrGlobal<T>(LocalName, IgnoreCase))
         return *ValueOr;
       else
-        logIfOptionParsingError(ValueOr.takeError());
+        reportOptionParsingError(ValueOr.takeError());
       return Default;
     }
 
     /// Returns the value for the option \p LocalName represented as a ``T``.
     /// If the option is missing returns None, if the option can't be parsed
     /// as a ``T``, log that to stderr and return None.
     template <typename T = std::string>
     llvm::Optional<T> getOptional(StringRef LocalName) const {
       if (auto ValueOr = get<T>(LocalName))
         return *ValueOr;
       else
-        logIfOptionParsingError(ValueOr.takeError());
+        reportOptionParsingError(ValueOr.takeError());
       return llvm::None;
     }
 
     /// Returns the value for the local or global option \p LocalName
     /// represented as a ``T``.
     /// If the option is missing returns None, if the
     /// option can't be parsed as a ``T``, log that to stderr and return None.
     template <typename T = std::string>
     llvm::Optional<T> getOptionalLocalOrGlobal(StringRef LocalName) const {
       if (auto ValueOr = getLocalOrGlobal<T>(LocalName))
         return *ValueOr;
       else
-        logIfOptionParsingError(ValueOr.takeError());
+        reportOptionParsingError(ValueOr.takeError());
       return llvm::None;
     }
 
     /// Stores an option with the check-local name \p LocalName with
     /// string value \p Value to \p Options.
     void store(ClangTidyOptions::OptionMap &Options, StringRef LocalName,
                StringRef Value) const;
 
typeEraseMapping() const {
                             MappedItem.second);
       }
       return Result;
     }
 
     void storeInt(ClangTidyOptions::OptionMap &Options, StringRef LocalName,
                   int64_t Value) const;
 
-    /// Logs an Error to stderr if a \p Err is not a MissingOptionError.
-    static void logIfOptionParsingError(llvm::Error &&Err);
+    /// Emits a diagnostic if \p Err is not a MissingOptionError.
+    void reportOptionParsingError(llvm::Error &&Err) const;
 
     std::string NamePrefix;
     const ClangTidyOptions::OptionMap &CheckOptions;
+    ClangTidyContext *Context;
   };
 
 private:
   void run(const ast_matchers::MatchFinder::MatchResult &Result) override;
   StringRef getID() const override { return CheckName; }
   std::string CheckName;
   ClangTidyContext *Context;
 

clang-tools-extra/clang-tidy/ClangTidyCheck.cpp

std::string UnparseableIntegerOptionError::message() const {
   Output << "invalid configuration value '" << LookupValue << "' for option '"
          << LookupName << "'; expected "
          << (IsBoolean ? "a bool" : "an integer value");
   return std::string(Buffer);
 }
 
 ClangTidyCheck::ClangTidyCheck(StringRef CheckName, ClangTidyContext *Context)
     : CheckName(CheckName), Context(Context),
-      Options(CheckName, Context->getOptions().CheckOptions) {
+      Options(CheckName, Context->getOptions().CheckOptions, Context) {
   assert(Context != nullptr);
   assert(!CheckName.empty());
 }
 
 DiagnosticBuilder ClangTidyCheck::diag(SourceLocation Loc, StringRef Message,
                                        DiagnosticIDs::Level Level) {
   return Context->diag(CheckName, Loc, Message, Level);
 }
 
+DiagnosticBuilder ClangTidyCheck::diag(StringRef Message,
+                                       DiagnosticIDs::Level Level) {
+  return Context->diag(CheckName, Message, Level);
+}
+
+DiagnosticBuilder
+ClangTidyCheck::configurationDiag(StringRef Description,
+                                  DiagnosticIDs::Level Level) {
+  return Context->configurationDiag(Description, Level);
+}
+
 void ClangTidyCheck::run(const ast_matchers::MatchFinder::MatchResult &Result) {
   // For historical reasons, checks don't implement the MatchFinder run()
   // callback directly. We keep the run()/check() distinction to avoid interface
   // churn, and to allow us to add cross-cutting logic in the future.
   check(Result);
 }
 
-ClangTidyCheck::OptionsView::OptionsView(StringRef CheckName,
-                         const ClangTidyOptions::OptionMap &CheckOptions)
-    : NamePrefix(CheckName.str() + "."), CheckOptions(CheckOptions) {}
+ClangTidyCheck::OptionsView::OptionsView(
+    StringRef CheckName, const ClangTidyOptions::OptionMap &CheckOptions,
+    ClangTidyContext *Context)
+    : NamePrefix(CheckName.str() + "."), CheckOptions(CheckOptions),
+      Context(Context) {}
 
 llvm::Expected<std::string>
 ClangTidyCheck::OptionsView::get(StringRef LocalName) const {
   const auto &Iter = CheckOptions.find(NamePrefix + LocalName.str());
   if (Iter != CheckOptions.end())
     return Iter->getValue().Value;
   return llvm::make_error<MissingOptionError>((NamePrefix + LocalName).str());
 }

 }
 
 template <>
 bool ClangTidyCheck::OptionsView::get<bool>(StringRef LocalName,
                                             bool Default) const {
   llvm::Expected<bool> ValueOr = get<bool>(LocalName);
   if (ValueOr)
     return *ValueOr;
-  logIfOptionParsingError(ValueOr.takeError());
+  reportOptionParsingError(ValueOr.takeError());
   return Default;
 }
 
 template <>
 llvm::Expected<bool>
 ClangTidyCheck::OptionsView::getLocalOrGlobal<bool>(StringRef LocalName) const {
   auto Iter = findPriorityOption(CheckOptions, NamePrefix, LocalName);
   if (Iter != CheckOptions.end())
     return getAsBool(Iter->getValue().Value, Iter->getKey());
   return llvm::make_error<MissingOptionError>((NamePrefix + LocalName).str());
 }
 
 template <>
 bool ClangTidyCheck::OptionsView::getLocalOrGlobal<bool>(StringRef LocalName,
                                                          bool Default) const {
   llvm::Expected<bool> ValueOr = getLocalOrGlobal<bool>(LocalName);
   if (ValueOr)
     return *ValueOr;
-  logIfOptionParsingError(ValueOr.takeError());
+  reportOptionParsingError(ValueOr.takeError());
   return Default;
 }
 
 void ClangTidyCheck::OptionsView::store(ClangTidyOptions::OptionMap &Options,
                                         StringRef LocalName,
                                         StringRef Value) const {
   Options[NamePrefix + LocalName.str()] = Value;
 }
llvm::Expected<int64_t> ClangTidyCheck::OptionsView::getEnumInt(
   }
   if (EditDistance < 3)
     return llvm::make_error<UnparseableEnumOptionError>(
         Iter->getKey().str(), Iter->getValue().Value, Closest.str());
   return llvm::make_error<UnparseableEnumOptionError>(Iter->getKey().str(),
                                                       Iter->getValue().Value);
 }
 
-void ClangTidyCheck::OptionsView::logIfOptionParsingError(llvm::Error &&Err) {
+void ClangTidyCheck::OptionsView::reportOptionParsingError(
+    llvm::Error &&Err) const {
   if (auto RemainingErrors =
           llvm::handleErrors(std::move(Err), [](const MissingOptionError &) {}))
-    llvm::logAllUnhandledErrors(std::move(RemainingErrors),
-                                llvm::WithColor::warning());
+    Context->configurationDiag(llvm::toString(std::move(RemainingErrors)));
 }
 
 template <>
 Optional<std::string> ClangTidyCheck::OptionsView::getOptional<std::string>(
     StringRef LocalName) const {
   if (auto ValueOr = get(LocalName))
     return *ValueOr;
   else

clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.h

public:
   ///
   /// This is still under heavy development and will likely change towards using
   /// tablegen'd diagnostic IDs.
   /// FIXME: Figure out a way to manage ID spaces.
   DiagnosticBuilder diag(StringRef CheckName, SourceLocation Loc,
                          StringRef Message,
                          DiagnosticIDs::Level Level = DiagnosticIDs::Warning);
 
+  DiagnosticBuilder diag(StringRef CheckName, StringRef Message,
+                         DiagnosticIDs::Level Level = DiagnosticIDs::Warning);
+
+  /// Report any errors to do with reading configuration using this method
+  DiagnosticBuilder
+  configurationDiag(StringRef Message,
+                    DiagnosticIDs::Level Level = DiagnosticIDs::Warning);
+
   /// Sets the \c SourceManager of the used \c DiagnosticsEngine.
   ///
   /// This is called from the \c ClangTidyCheck base class.
   void setSourceManager(SourceManager *SourceMgr);
 
   /// Should be called when starting to process new translation unit.
   void setCurrentFile(StringRef File);
 

clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.cpp

DiagnosticBuilder ClangTidyContext::diag(
     DiagnosticIDs::Level Level /* = DiagnosticIDs::Warning*/) {
   assert(Loc.isValid());
   unsigned ID = DiagEngine->getDiagnosticIDs()->getCustomDiagID(
       Level, (Description + " [" + CheckName + "]").str());
   CheckNamesByDiagnosticID.try_emplace(ID, CheckName);
   return DiagEngine->Report(Loc, ID);
 }
 
+DiagnosticBuilder ClangTidyContext::diag(
+    StringRef CheckName, StringRef Description,
+    DiagnosticIDs::Level Level /* = DiagnosticIDs::Warning*/) {
+  unsigned ID = DiagEngine->getDiagnosticIDs()->getCustomDiagID(
+      Level, (Description + " [" + CheckName + "]").str());
+  CheckNamesByDiagnosticID.try_emplace(ID, CheckName);
+  return DiagEngine->Report(ID);
+}
+
+DiagnosticBuilder ClangTidyContext::configurationDiag(
+    StringRef Message,
+    DiagnosticIDs::Level Level /* = DiagnosticIDs::Warning*/) {
+  return diag("clang-tidy-config", Message, Level);
+}
+
 void ClangTidyContext::setSourceManager(SourceManager *SourceMgr) {
   DiagEngine->setSourceManager(SourceMgr);
 }
 
 void ClangTidyContext::setCurrentFile(StringRef File) {
   CurrentFile = std::string(File);
   CurrentOptions = getOptionsForFile(CurrentFile);
   CheckFilter = std::make_unique<CachedGlobList>(*getOptions().Checks);
ClangTidyDiagnosticConsumer::ClangTidyDiagnosticConsumer(
     : Context(Ctx), ExternalDiagEngine(ExternalDiagEngine),
       RemoveIncompatibleErrors(RemoveIncompatibleErrors),
       LastErrorRelatesToUserCode(false), LastErrorPassesLineFilter(false),
       LastErrorWasIgnored(false) {}
 
 void ClangTidyDiagnosticConsumer::finalizeLastError() {
   if (!Errors.empty()) {
     ClangTidyError &Error = Errors.back();
-    if (!Context.isCheckEnabled(Error.DiagnosticName) &&
+    if (Error.DiagnosticName == "clang-tidy-config") {
+      // Never ignore these.
+    } else if (!Context.isCheckEnabled(Error.DiagnosticName) &&
                Error.DiagLevel != ClangTidyError::Error) {
       ++Context.Stats.ErrorsIgnoredCheckFilter;
       Errors.pop_back();
     } else if (!LastErrorRelatesToUserCode) {
       ++Context.Stats.ErrorsIgnoredNonUserCode;
       Errors.pop_back();
     } else if (!LastErrorPassesLineFilter) {
       ++Context.Stats.ErrorsIgnoredLineFilter;
       Errors.pop_back();

clang-tools-extra/clang-tidy/bugprone/DynamicStaticInitializersCheck.cpp

 DynamicStaticInitializersCheck::DynamicStaticInitializersCheck(StringRef Name,
                                                                ClangTidyContext *Context)
     : ClangTidyCheck(Name, Context),
       RawStringHeaderFileExtensions(Options.getLocalOrGlobal(
         "HeaderFileExtensions", utils::defaultHeaderFileExtensions())) {
   if (!utils::parseFileExtensions(RawStringHeaderFileExtensions,
                                   HeaderFileExtensions,
                                   utils::defaultFileExtensionDelimiters())) {
-    llvm::errs() << "Invalid header file extension: "
-                 << RawStringHeaderFileExtensions << "\n";
+    this->configurationDiag("Invalid header file extension: '%0'")
+        << RawStringHeaderFileExtensions;
   }
 }
 
 void DynamicStaticInitializersCheck::storeOptions(
     ClangTidyOptions::OptionMap &Opts) {
   Options.store(Opts, "HeaderFileExtensions", RawStringHeaderFileExtensions);
 }
 

clang-tools-extra/clang-tidy/bugprone/SuspiciousIncludeCheck.cpp

: ClangTidyCheck(Name, Context),
       RawStringHeaderFileExtensions(Options.getLocalOrGlobal(
           "HeaderFileExtensions", utils::defaultHeaderFileExtensions())),
       RawStringImplementationFileExtensions(Options.getLocalOrGlobal(
           "ImplementationFileExtensions",
           utils::defaultImplementationFileExtensions())) {
   if (!utils::parseFileExtensions(RawStringImplementationFileExtensions,
                                   ImplementationFileExtensions,
                                   utils::defaultFileExtensionDelimiters())) {
-    llvm::errs() << "Invalid implementation file extension: "
-                 << RawStringImplementationFileExtensions << "\n";
+    this->configurationDiag("Invalid implementation file extension: '%0'")
+        << RawStringImplementationFileExtensions;
   }
 
   if (!utils::parseFileExtensions(RawStringHeaderFileExtensions,
                                   HeaderFileExtensions,
                                   utils::defaultFileExtensionDelimiters())) {
-    llvm::errs() << "Invalid header file extension: "
-                 << RawStringHeaderFileExtensions << "\n";
+    this->configurationDiag("Invalid header file extension: '%0'")
+        << RawStringHeaderFileExtensions;
   }
 }
 
 void SuspiciousIncludeCheck::storeOptions(ClangTidyOptions::OptionMap &Opts) {
   Options.store(Opts, "ImplementationFileExtensions",
                 RawStringImplementationFileExtensions);
   Options.store(Opts, "HeaderFileExtensions", RawStringHeaderFileExtensions);
 }

clang-tools-extra/clang-tidy/cppcoreguidelines/PreferMemberInitializerCheck.cpp

 }
 
 PreferMemberInitializerCheck::PreferMemberInitializerCheck(
     StringRef Name, ClangTidyContext *Context)
     : ClangTidyCheck(Name, Context),
       IsUseDefaultMemberInitEnabled(
           Context->isCheckEnabled("modernize-use-default-member-init")),
       UseAssignment(OptionsView("modernize-use-default-member-init",
-                                Context->getOptions().CheckOptions)
+                                Context->getOptions().CheckOptions, Context)
                         .get("UseAssignment", false)) {}
 
 void PreferMemberInitializerCheck::storeOptions(
     ClangTidyOptions::OptionMap &Opts) {
   Options.store(Opts, "UseAssignment", UseAssignment);
 }
 
 void PreferMemberInitializerCheck::registerMatchers(MatchFinder *Finder) {

clang-tools-extra/clang-tidy/google/GlobalNamesInHeadersCheck.cpp

 GlobalNamesInHeadersCheck::GlobalNamesInHeadersCheck(StringRef Name,
                                                      ClangTidyContext *Context)
     : ClangTidyCheck(Name, Context),
       RawStringHeaderFileExtensions(Options.getLocalOrGlobal(
           "HeaderFileExtensions", utils::defaultHeaderFileExtensions())) {
   if (!utils::parseFileExtensions(RawStringHeaderFileExtensions,
                                   HeaderFileExtensions,
                                   utils::defaultFileExtensionDelimiters())) {
-    llvm::errs() << "Invalid header file extension: "
-                 << RawStringHeaderFileExtensions << "\n";
+    this->configurationDiag("Invalid header file extension: '%0'")
+        << RawStringHeaderFileExtensions;
   }
 }
 
 void GlobalNamesInHeadersCheck::storeOptions(
     ClangTidyOptions::OptionMap &Opts) {
   Options.store(Opts, "HeaderFileExtensions", RawStringHeaderFileExtensions);
 }
 

clang-tools-extra/clang-tidy/google/UnnamedNamespaceInHeaderCheck.cpp

 UnnamedNamespaceInHeaderCheck::UnnamedNamespaceInHeaderCheck(
     StringRef Name, ClangTidyContext *Context)
     : ClangTidyCheck(Name, Context),
       RawStringHeaderFileExtensions(Options.getLocalOrGlobal(
           "HeaderFileExtensions", utils::defaultHeaderFileExtensions())) {
   if (!utils::parseFileExtensions(RawStringHeaderFileExtensions,
                                   HeaderFileExtensions,
                                   utils::defaultFileExtensionDelimiters())) {
-    llvm::errs() << "Invalid header file extension: "
-                 << RawStringHeaderFileExtensions << "\n";
+    this->configurationDiag("Invalid header file extension: '%0'")
+        << RawStringHeaderFileExtensions;
   }
 }
 
 void UnnamedNamespaceInHeaderCheck::storeOptions(
     ClangTidyOptions::OptionMap &Opts) {
   Options.store(Opts, "HeaderFileExtensions", RawStringHeaderFileExtensions);
 }
 

clang-tools-extra/clang-tidy/misc/DefinitionsInHeadersCheck.cpp

DefinitionsInHeadersCheck::DefinitionsInHeadersCheck(StringRef Name,
                                                      ClangTidyContext *Context)
     : ClangTidyCheck(Name, Context),
       UseHeaderFileExtension(Options.get("UseHeaderFileExtension", true)),
       RawStringHeaderFileExtensions(Options.getLocalOrGlobal(
           "HeaderFileExtensions", utils::defaultHeaderFileExtensions())) {
   if (!utils::parseFileExtensions(RawStringHeaderFileExtensions,
                                   HeaderFileExtensions,
                                   utils::defaultFileExtensionDelimiters())) {
-    // FIXME: Find a more suitable way to handle invalid configuration
-    // options.
-    llvm::errs() << "Invalid header file extension: "
-                 << RawStringHeaderFileExtensions << "\n";
+    this->configurationDiag("Invalid header file extension: '%0'")
+        << RawStringHeaderFileExtensions;
   }
 }
 
 void DefinitionsInHeadersCheck::storeOptions(
     ClangTidyOptions::OptionMap &Opts) {
   Options.store(Opts, "UseHeaderFileExtension", UseHeaderFileExtension);
   Options.store(Opts, "HeaderFileExtensions", RawStringHeaderFileExtensions);
 }

clang-tools-extra/clang-tidy/modernize/LoopConvertCheck.cpp

 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Lex/Lexer.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/StringSwitch.h"
 #include "llvm/Support/Casting.h"
-#include "llvm/Support/WithColor.h"
 #include "llvm/Support/raw_ostream.h"
 #include <cassert>
 #include <cstring>
 #include <utility>
 
 using namespace clang::ast_matchers;
 using namespace llvm;
 
: ClangTidyCheck(Name, Context), TUInfo(new TUTrackingInfo),
       NamingStyle(Options.get("NamingStyle", VariableNamer::NS_CamelCase)),
       Inserter(Options.getLocalOrGlobal("IncludeStyle",
                                         utils::IncludeSorter::IS_LLVM)),
       UseCxx20IfAvailable(Options.get("UseCxx20ReverseRanges", true)),
       ReverseFunction(Options.get("MakeReverseRangeFunction", "")),
       ReverseHeader(Options.get("MakeReverseRangeHeader", "")) {
 
   if (ReverseFunction.empty() && !ReverseHeader.empty()) {
-    llvm::WithColor::warning()
-        << "modernize-loop-convert: 'MakeReverseRangeHeader' is set but "
-           "'MakeReverseRangeFunction' is not, disabling reverse loop "
-           "transformation\n";
+    configurationDiag(
+        "modernize-loop-convert: 'MakeReverseRangeHeader' is set but "
+        "transformation");
     UseReverseRanges = false;
   } else if (ReverseFunction.empty()) {
     UseReverseRanges = UseCxx20IfAvailable && getLangOpts().CPlusPlus20;
   } else {
     UseReverseRanges = true;
   }
 }
 

clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.cpp

IdentifierNamingCheck::getStyleForFile(StringRef FileName) const {
   StringRef Parent = llvm::sys::path::parent_path(FileName);
   auto Iter = NamingStylesCache.find(Parent);
   if (Iter != NamingStylesCache.end())
     return Iter->getValue();
 
   ClangTidyOptions Options = Context->getOptionsForFile(FileName);
   if (Options.Checks && GlobList(*Options.Checks).contains(CheckName)) {
     auto It = NamingStylesCache.try_emplace(
-        Parent, getFileStyleFromOptions({CheckName, Options.CheckOptions}));
+        Parent,
+        getFileStyleFromOptions({CheckName, Options.CheckOptions, Context}));
     assert(It.second);
     return It.first->getValue();
   }
   // Default construction gives an empty style.
   auto It = NamingStylesCache.try_emplace(Parent);
   assert(It.second);
   return It.first->getValue();
 }
 
 } // namespace readability
 } // namespace tidy
 } // namespace clang

clang-tools-extra/test/clang-tidy/checkers/readability-identifier-naming-case-violation.cpp

 // RUN: clang-tidy %s -checks=readability-identifier-naming \
 // RUN:   -config="{CheckOptions: [\
 // RUN:   {key: readability-identifier-naming.FunctionCase, value: camelback}, \
 // RUN:   {key: readability-identifier-naming.VariableCase, value: camelBack}, \
 // RUN:   {key: readability-identifier-naming.ClassCase, value: UUPER_CASE}, \
 // RUN:   {key: readability-identifier-naming.StructCase, value: CAMEL}, \
 // RUN:   {key: readability-identifier-naming.EnumCase, value: AnY_cASe}, \
-// RUN:   ]}" 2>&1 | FileCheck %s --implicit-check-not warning
+// RUN:   ]}" 2>&1 | FileCheck %s --implicit-check-not="{{warning|error}}:"
 
-// CHECK-DAG: warning: invalid configuration value 'camelback' for option 'readability-identifier-naming.FunctionCase'; did you mean 'camelBack'?{{$}}
-// CHECK-DAG: warning: invalid configuration value 'UUPER_CASE' for option 'readability-identifier-naming.ClassCase'; did you mean 'UPPER_CASE'?{{$}}
+// CHECK-DAG: warning: invalid configuration value 'camelback' for option 'readability-identifier-naming.FunctionCase'; did you mean 'camelBack'? [clang-tidy-config]
+// CHECK-DAG: warning: invalid configuration value 'UUPER_CASE' for option 'readability-identifier-naming.ClassCase'; did you mean 'UPPER_CASE'? [clang-tidy-config]
 // Don't try to suggest an alternative for 'CAMEL'
-// CHECK-DAG: warning: invalid configuration value 'CAMEL' for option 'readability-identifier-naming.StructCase'{{$}}
+// CHECK-DAG: warning: invalid configuration value 'CAMEL' for option 'readability-identifier-naming.StructCase' [clang-tidy-config]
 // This fails on the EditDistance, but as it matches ignoring case suggest the correct value
-// CHECK-DAG: warning: invalid configuration value 'AnY_cASe' for option 'readability-identifier-naming.EnumCase'; did you mean 'aNy_CasE'?{{$}}
+// CHECK-DAG: warning: invalid configuration value 'AnY_cASe' for option 'readability-identifier-naming.EnumCase'; did you mean 'aNy_CasE'? [clang-tidy-config]

clang-tools-extra/unittests/clang-tidy/ClangTidyDiagnosticConsumerTest.cpp

 #include "ClangTidy.h"
 #include "ClangTidyTest.h"
 #include "gtest/gtest.h"
 
 namespace clang {
 namespace tidy {
 namespace test {
 
 namespace {
 class TestCheck : public ClangTidyCheck {
 public:
   TestCheck(StringRef Name, ClangTidyContext *Context)
-      : ClangTidyCheck(Name, Context) {}
+      : ClangTidyCheck(Name, Context) {
+    diag("DiagWithNoLoc");
+  }
   void registerMatchers(ast_matchers::MatchFinder *Finder) override {
     Finder->addMatcher(ast_matchers::varDecl().bind("var"), this);
   }
   void check(const ast_matchers::MatchFinder::MatchResult &Result) override {
     const auto *Var = Result.Nodes.getNodeAs<VarDecl>("var");
     // Add diagnostics in the wrong order.
     diag(Var->getLocation(), "variable");
     diag(Var->getTypeSpecStartLoc(), "type specifier");
   }
 };
 } // namespace
 
 TEST(ClangTidyDiagnosticConsumer, SortsErrors) {
   std::vector<ClangTidyError> Errors;
   runCheckOnCode<TestCheck>("int a;", &Errors);
-  EXPECT_EQ(2ul, Errors.size());
-  EXPECT_EQ("type specifier", Errors[0].Message.Message);
-  EXPECT_EQ("variable", Errors[1].Message.Message);
+  EXPECT_EQ(3ul, Errors.size());
+  EXPECT_EQ("DiagWithNoLoc", Errors[0].Message.Message);
+  EXPECT_EQ("type specifier", Errors[1].Message.Message);
+  EXPECT_EQ("variable", Errors[2].Message.Message);
 }
 
 } // namespace test
 } // namespace tidy
 } // namespace clang