Extra Clang Tools 5.0.0 Release Notes — Extra Clang Tools 5 documentation

# Extra Clang Tools 5 documentation

## Extra Clang Tools 5.0.0 Release Notes

- Introduction
- What’s New in Extra Clang Tools 5.0.0?
  - Improvements to clang-tidy

Written by the LLVM Team

## Introduction

This document contains the release notes for the Extra Clang Tools, part of the Clang release 5.0.0. 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.

## What’s New in Extra Clang Tools 5.0.0?

### Improvements to clang-tidy

- New android-cloexec-creat check

  Detect usage of `creat()`.

- New android-cloexec-open check

  Checks if the required file flag `O_CLOEXEC` exists in `open()`, `open64()` and `openat()`.

- New android-cloexec-fopen check

  Checks if the required mode `e` exists in the mode argument of `fopen()`.

- New android-cloexec-socket check

  Checks if the required file flag `SOCK_CLOEXEC` is present in the argument of `socket()`.

- New bugprone-suspicious-memset-usage check

  Finds `memset()` calls with potential mistakes in their arguments. Replaces and extends the `google-runtime-memset` check.

- New bugprone-undefined-memory-manipulation check

  Finds calls of memory manipulation functions `memset()`, `memcpy()` and `memmove()` on not TriviallyCopyable objects resulting in undefined behavior.

- New cert-dcl21-cpp check

  Checks if the overloaded postfix `operator++/--` returns a constant object.

- New cert-dcl58-cpp check

  Finds modification of the `std` or `posix` namespace.

- Improved cppcoreguidelines-no-malloc check

  Allow custom memory management functions to be considered as well.

- New misc-forwarding-reference-overload check

  Finds perfect forwarding constructors that can unintentionally hide copy or move constructors.

- New misc-lambda-function-name check

  Finds uses of `__func__` or `__FUNCTION__` inside lambdas.

- New modernize-replace-random-shuffle check

  Finds and fixes usage of `std::random_shuffle` as the function has been removed from C++17.

- New modernize-return-braced-init-list check

  Finds and replaces explicit calls to the constructor in a return statement by a braced initializer list so that the return type is not needlessly repeated.

- New modernize-unary-static-assert-check check

  The check diagnoses any `static_assert` declaration with an empty string literal and provides a fix-it to replace the declaration with a single-argument `static_assert` declaration.

- Improved modernize-use-emplace check

  Removes unnecessary `std::make_pair` and `std::make_tuple` calls in push_back calls and turns them into emplace_back. The check now also is able to remove user-defined make functions from `push_back` calls on containers of custom tuple-like types by providing TupleTypes and TupleMakeFunctions.

- New modernize-use-noexcept check

  Replaces dynamic exception specifications with `noexcept` or a user defined macro.

- New performance-inefficient-vector-operation check

  Finds possible inefficient vector operations in for loops that may cause unnecessary memory reallocations.

- Added NestingThreshold to readability-function-size check

  Finds compound statements which create next nesting level after NestingThreshold and emits a warning.

- Added ParameterThreshold to readability-function-size check

  Finds functions that have more than ParameterThreshold parameters and emits a warning.

- New readability-misleading-indentation check

  Finds misleading indentation where braces should be introduced or the code should be reformatted.

- Support clang-formatting of the code around applied fixes (`-format-style` command-line option).

- New bugprone module

  Adds checks that target bugprone code constructs.

- New hicpp module

  Adds checks that implement the High Integrity C++ Coding Standard and other safety standards. Many checks are aliased to other modules.