Extra Clang Tools 14.0.0 (In-Progress) Release Notes¶

Introduction
What’s New in Extra Clang Tools 14.0.0?

Written by the LLVM Team

Warning

These are in-progress notes for the upcoming Extra Clang Tools 14 release. Release notes for previous releases can be found on the Download Page.

Introduction ¶

This document contains the release notes for the Extra Clang Tools, part of the Clang release 14.0.0. 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.

Make the cppcoreguidelines-pro-bounds-array-to-pointer-decay check accept string literal to pointer decay in conditional operator even if operands are of the same length.
Ignore warnings from macros defined in system headers, if not using the -system-headers flag.
Added support for globbing in NOLINT* expressions, to simplify suppressing multiple warnings in the same line.
Added support for NOLINTBEGIN … NOLINTEND comments to suppress Clang-Tidy warnings over multiple lines.
Generalized the modernize-use-default-member-init check to handle non-default constructors.
Eliminated false positives for cppcoreguidelines-macro-usage by restricting the warning about using constants to only macros that expand to literals.

New checks ¶

New bugprone-stringview-nullptr check.

Checks for various ways that the const CharT* constructor of std::basic_string_view can be passed a null argument.
New abseil-cleanup-ctad check.

Suggests switching the initialization pattern of absl::Cleanup instances from the factory function to class template argument deduction (CTAD), in C++17 and higher.
New bugprone-suspicious-memory-comparison check.

Finds potentially incorrect calls to memcmp() based on properties of the arguments.
New cppcoreguidelines-virtual-class-destructor check.

Finds virtual classes whose destructor is neither public and virtual nor protected and non-virtual.
New misc-misleading-identifier check.

Reports identifier with unicode right-to-left characters.
New readability-container-data-pointer check.

Finds cases where code could use data() rather than the address of the element at index 0 in a container.
New readability-identifier-length check.

Reports identifiers whose names are too short. Currently checks local variables and function parameters only.
New misc-misleading-bidirectional check.

Inspects string literal and comments for unterminated bidirectional Unicode characters.

New check aliases ¶

New alias cert-err33-c to bugprone-unused-return-value was added.
New alias cert-exp42-c to bugprone-suspicious-memory-comparison was added.
New alias cert-flp37-c to bugprone-suspicious-memory-comparison was added.

Changes in existing checks ¶

Removed default setting cppcoreguidelines-explicit-virtual-functions.IgnoreDestructors = "true", to match the current state of the C++ Core Guidelines.
Updated google-readability-casting to diagnose and fix functional casts, to achieve feature parity with the corresponding cpplint.py check.
Fixed a false positive in fuchsia-trailing-return for C++17 deduction guides.
Fixed a false positive in bugprone-throw-keyword-missing when creating an exception object using placement new
cppcoreguidelines-narrowing-conversions check now supports a WarnOnIntegerToFloatingPointNarrowingConversion option to control whether to warn on narrowing integer to floating-point conversions.

Extra Clang Tools 14 documentation