Extra Clang Tools 9.0.0 (In-Progress) Release Notes

Written by the LLVM Team


These are in-progress notes for the upcoming Extra Clang Tools 9 release. Release notes for previous releases can be found on the Download Page.


This document contains the release notes for the Extra Clang Tools, part of the Clang release 9.0.0. 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 Subversion 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 9.0.0?

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

The improvements are…

Improvements to clang-doc

The improvements are…

Improvements to clang-rename

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Improvements to clang-tidy

  • New OpenMP module.

    For checks specific to OpenMP API.

  • New abseil-duration-addition check.

    Checks for cases where addition should be performed in the absl::Time domain.

  • New abseil-duration-conversion-cast check.

    Checks for casts of absl::Duration conversion functions, and recommends the right conversion function instead.

  • New abseil-duration-unnecessary-conversion check.

    Finds and fixes cases where absl::Duration values are being converted to numeric types and back again.

  • New abseil-time-comparison check.

    Prefer comparisons in the absl::Time domain instead of the integer domain.

  • New abseil-time-subtraction check.

    Finds and fixes absl::Time subtraction expressions to do subtraction in the Time domain instead of the numeric domain.

  • New google-readability-avoid-underscore-in-googletest-name check.

    Checks whether there are underscores in googletest test and test case names in test macros, which is prohibited by the Googletest FAQ.

  • New objc-super-self check.

    Finds invocations of -self on super instances in initializers of subclasses of NSObject and recommends calling a superclass initializer instead.

  • New alias cppcoreguidelines-explicit-virtual-functions to modernize-use-override was added.

  • The bugprone-argument-comment now supports CommentBoolLiterals, CommentIntegerLiterals, CommentFloatLiterals, CommentUserDefiniedLiterals, CommentStringLiterals, CommentCharacterLiterals & CommentNullPtrs options.

  • The bugprone-too-small-loop-variable now supports MagnitudeBitsUpperLimit option. The default value was set to 16, which greatly reduces warnings related to loops which are unlikely to cause an actual functional bug.

  • The google-runtime-int check has been disabled in Objective-C++.

  • The Acronyms and IncludeDefaultAcronyms options for the objc-property-declaration check have been removed.

  • The modernize-use-override now supports OverrideSpelling and FinalSpelling options.

  • New openmp-exception-escape check.

    Analyzes OpenMP Structured Blocks and checks that no exception escapes out of the Structured Block it was thrown in.

  • New openmp-use-default-none check.

    Finds OpenMP directives that are allowed to contain a default clause, but either don’t specify it or the clause is specified but with the kind other than none, and suggests to use the default(none) clause.

Improvements to clang-include-fixer

The improvements are…

Improvements to modularize

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Improvements to pp-trace

  • Added a new option -callbacks to filter preprocessor callbacks. It replaces the -ignore option.