Extra Clang Tools 13.0.0 Release Notes

Written by the LLVM Team


This document contains the release notes for the Extra Clang Tools, part of the Clang release 13.0.0. Here we describe the status of the Extra Clang Tools in some detail, including major improvements from the previous release and new feature work. All LLVM releases may be downloaded from the LLVM releases web site.

For more information about Clang or LLVM, including information about the latest release, please see the Clang Web Site or the LLVM Web Site.

Note that if you are reading this file from a Git checkout or the main Clang web page, this document applies to the next release, not the current one. To see the release notes for a specific release, please see the releases page.

What’s New in Extra Clang Tools 13.0.0?

Some of the major new features and improvements to Extra Clang Tools are listed here. Generic improvements to Extra Clang Tools as a whole or to its underlying infrastructure are described first, followed by tool-specific sections.

Improvements to clangd

Code Completion

  • ML based model is used by default for ranking completion candidates.

  • Support for completion of attributes.

  • Improved handling of Objective-C(++) constructs.


  • Shows documentation for Attributes.

  • Displays resolved paths for includes.

  • Shows padding for fields.

Document Outline

  • Contains information in detail field about extra type information

  • Macro expansions now show up in the tree

  • Improved handling of Objective-C(++) constructs.

Code Navigation

  • Cross references surfaces occurrences for calls to overridden methods and declarations.

Semantic Highlighting

  • Support for legacy semantic tokens extension is dropped.

  • Better support for Objective-C(++) constructs and dependent code.


  • Diagnostics for unused/deprecated code are tagged according to LSP.

  • Clang-tidy checks that operate at translation-unit level are now available.

System Integration

  • Compile flag parsing has been improved to be more resilient against multiple jobs.

  • Better error reporting when compile flags are unusable.


  • Better support for TUs with circular includes (e.g. templated header vs implementation file).

  • Compile flags for headers are inferred from files known to be including them when possible.

  • Version info contains information about compile-time setup of clangd

  • FeatureModule mechanism has been introduced to make contribution of vertical features to clangd easier, by making it possible to write features that can interact with clangd-core without touching it.

  • There’s an extension for inlay-hints for deduced types and parameter names, hidden behind -inlay-hints flag.

  • Rename is more robust:

    • Won’t trigger on non-identifiers.

    • Makes use of dirty buffers for open files.

  • Improvements to dex query latency.

  • There’s a remote-index service for LLVM at http://clangd-index.llvm.org/.

  • There’s a remote-index service for Chromium at https://linux.clangd-index.chromium.org/.

Improvements to clang-doc

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Improvements to clang-query

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Improvements to clang-rename

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Improvements to clang-tidy

  • The run-clang-tidy.py helper script is now installed in bin/ as run-clang-tidy. It was previously installed in share/clang/.

  • Added command line option –fix-notes to apply fixes found in notes attached to warnings. These are typically cases where we are less confident the fix will have the desired effect.

  • libToolingCore and Clang-Tidy was refactored and now checks can produce highlights (^~~~~ under fragments of the source code) in diagnostics. Existing and new checks in the future can be expected to start implementing this functionality. This change only affects the visual rendering of diagnostics, and does not alter the behavior of generated fixes.

New checks

Changes in existing checks

  • Improved bugprone-signal-handler check.

    Added an option to choose the set of allowed functions.

  • Improved cppcoreguidelines-init-variables check.

    Removed generating fixes for enums because the code generated was broken, trying to initialize the enum from an integer.

    The check now also warns for uninitialized scoped enums.

  • Improved readability-uniqueptr-delete-release check.

    Added an option to choose whether to refactor by calling the reset member function or assignment to nullptr. Added support for pointers to std::unique_ptr.

Removed checks

  • The readability-deleted-default check has been removed.

    The clang warning Wdefaulted-function-deleted will diagnose the same issues and is enabled by default.

Improvements to include-fixer

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Improvements to clang-include-fixer

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Improvements to modularize

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Improvements to pp-trace

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