docs/ReleaseNotes.rst - clang-tools-extra - Git at Google

 ===================================================
 Extra Clang Tools 8.0.0 (In-Progress) Release Notes
 ===================================================

 .. contents::
    :local:
    :depth: 3

 Written by the `LLVM Team <https://llvm.org/>`_

 .. warning::

    These are in-progress notes for the upcoming Extra Clang Tools 8 release.
    Release notes for previous releases can be found on
    `the Download Page <https://releases.llvm.org/download.html>`_.

 Introduction
 ============

 This document contains the release notes for the Extra Clang Tools, part of the
 Clang release 8.0.0. 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 <https://llvm.org/releases/>`_.

 For more information about Clang or LLVM, including information about
 the latest release, please see the `Clang Web Site <https://clang.llvm.org>`_ or
 the `LLVM Web Site <https://llvm.org>`_.

 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 <https://llvm.org/releases/>`_.

 What's New in Extra Clang Tools 8.0.0?
 ======================================

 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.

 Major New Features
 ------------------

 ...

 Improvements to clangd
 ----------------------

 The improvements are...

 Improvements to clang-doc
 -------------------------

 The improvements are...

 Improvements to clang-query
 ---------------------------

 The improvements are...

 Improvements to clang-rename
 ----------------------------

 The improvements are...

 Improvements to clang-tidy
 --------------------------

 - New :doc:`abseil-duration-comparison
   <clang-tidy/checks/abseil-duration-comparison>` check.

   Checks for comparisons which should be done in the ``absl::Duration`` domain
   instead of the float of integer domains.

 - New :doc:`abseil-duration-division
   <clang-tidy/checks/abseil-duration-division>` check.

   Checks for uses of ``absl::Duration`` division that is done in a
   floating-point context, and recommends the use of a function that
   returns a floating-point value.

 - New :doc:`abseil-duration-factory-float
   <clang-tidy/checks/abseil-duration-factory-float>` check.

   Checks for cases where the floating-point overloads of various
   ``absl::Duration`` factory functions are called when the more-efficient
   integer versions could be used instead.

 - New :doc:`abseil-duration-factory-scale
   <clang-tidy/checks/abseil-duration-factory-scale>` check.

   Checks for cases where arguments to ``absl::Duration`` factory functions are
   scaled internally and could be changed to a different factory function.

 - New :doc:`abseil-duration-subtraction
   <clang-tidy/checks/abseil-duration-subtraction>` check.

   Checks for cases where subtraction should be performed in the
   ``absl::Duration`` domain.

 - New :doc:`abseil-faster-strsplit-delimiter
   <clang-tidy/checks/abseil-faster-strsplit-delimiter>` check.

   Finds instances of ``absl::StrSplit()`` or ``absl::MaxSplits()`` where the
   delimiter is a single character string literal and replaces with a character.

 - New :doc:`abseil-no-internal-dependencies
   <clang-tidy/checks/abseil-no-internal-dependencies>` check.

   Gives a warning if code using Abseil depends on internal details.

 - New :doc:`abseil-no-namespace
   <clang-tidy/checks/abseil-no-namespace>` check.

   Ensures code does not open ``namespace absl`` as that violates Abseil's
   compatibility guidelines.

 - New :doc:`abseil-redundant-strcat-calls
   <clang-tidy/checks/abseil-redundant-strcat-calls>` check.

   Suggests removal of unnecessary calls to ``absl::StrCat`` when the result is
   being passed to another ``absl::StrCat`` or ``absl::StrAppend``.

 - New :doc:`abseil-str-cat-append
   <clang-tidy/checks/abseil-str-cat-append>` check.

   Flags uses of ``absl::StrCat()`` to append to a ``std::string``. Suggests
   ``absl::StrAppend()`` should be used instead.

 - New :doc:`abseil-upgrade-duration-conversions
   <clang-tidy/checks/abseil-upgrade-duration-conversions>` check.

   Finds calls to ``absl::Duration`` arithmetic operators and factories whose
   argument needs an explicit cast to continue compiling after upcoming API
   changes.

 - New :doc:`bugprone-too-small-loop-variable
   <clang-tidy/checks/bugprone-too-small-loop-variable>` check.

   Detects those ``for`` loops that have a loop variable with a "too small" type
   which means this type can't represent all values which are part of the
   iteration range.

 - New :doc:`cppcoreguidelines-macro-usage
   <clang-tidy/checks/cppcoreguidelines-macro-usage>` check.

   Finds macro usage that is considered problematic because better language
   constructs exist for the task.

 - New :doc:`google-objc-function-naming
   <clang-tidy/checks/google-objc-function-naming>` check.

   Checks that function names in function declarations comply with the naming
   conventions described in the Google Objective-C Style Guide.

 - New :doc:`misc-non-private-member-variables-in-classes
   <clang-tidy/checks/misc-non-private-member-variables-in-classes>` check.

   Finds classes that not only contain the data (non-static member variables),
   but also have logic (non-static member functions), and diagnoses all member
   variables that have any other scope other than ``private``.

 - New :doc:`modernize-avoid-c-arrays
   <clang-tidy/checks/modernize-avoid-c-arrays>` check.

   Finds C-style array types and recommend to use ``std::array<>`` /
   ``std::vector<>``.

 - New :doc:`modernize-concat-nested-namespaces
   <clang-tidy/checks/modernize-concat-nested-namespaces>` check.

   Checks for uses of nested namespaces in the form of
   ``namespace a { namespace b { ... }}`` and offers change to
   syntax introduced in C++17 standard: ``namespace a::b { ... }``.

 - New :doc:`modernize-deprecated-ios-base-aliases
   <clang-tidy/checks/modernize-deprecated-ios-base-aliases>` check.

   Detects usage of the deprecated member types of ``std::ios_base`` and replaces
   those that have a non-deprecated equivalent.

 - New :doc:`readability-isolate-decl
   <clang-tidy/checks/readability-isolate-declaration>` check.

   Detects local variable declarations declaring more than one variable and
   tries to refactor the code to one statement per declaration.

 - New :doc:`readability-const-return-type
   <clang-tidy/checks/readability-const-return-type>` check.

   Checks for functions with a ``const``-qualified return type and recommends
   removal of the ``const`` keyword.

 - New :doc:`readability-magic-numbers
   <clang-tidy/checks/readability-magic-numbers>` check.

   Detects usage of magic numbers, numbers that are used as literals instead of
   introduced via constants or symbols.

 - New :doc:`readability-uppercase-literal-suffix
   <clang-tidy/checks/readability-uppercase-literal-suffix>` check.

   Detects when the integral literal or floating point literal has non-uppercase
   suffix, and suggests to make the suffix uppercase. The list of destination
   suffixes can be optionally provided.

 - New alias :doc:`cert-dcl16-c
   <clang-tidy/checks/cert-dcl16-c>` to :doc:`readability-uppercase-literal-suffix
   <clang-tidy/checks/readability-uppercase-literal-suffix>`
   added.

 - New alias :doc:`cppcoreguidelines-avoid-c-arrays
   <clang-tidy/checks/cppcoreguidelines-avoid-c-arrays>`
   to :doc:`modernize-avoid-c-arrays
   <clang-tidy/checks/modernize-avoid-c-arrays>` added.

 - New alias :doc:`cppcoreguidelines-non-private-member-variables-in-classes
   <clang-tidy/checks/cppcoreguidelines-non-private-member-variables-in-classes>`
   to :doc:`misc-non-private-member-variables-in-classes
   <clang-tidy/checks/misc-non-private-member-variables-in-classes>`
   added.

 - New alias :doc:`hicpp-avoid-c-arrays
   <clang-tidy/checks/hicpp-avoid-c-arrays>`
   to :doc:`modernize-avoid-c-arrays
   <clang-tidy/checks/modernize-avoid-c-arrays>` added.

 - New alias :doc:`hicpp-uppercase-literal-suffix
   <clang-tidy/checks/hicpp-uppercase-literal-suffix>` to
   :doc:`readability-uppercase-literal-suffix
   <clang-tidy/checks/readability-uppercase-literal-suffix>`
   added.

 - The :doc:`readability-redundant-smartptr-get
   <clang-tidy/checks/readability-redundant-smartptr-get>` check does not warn
   about calls inside macros anymore by default.

 - The :doc:`cppcoreguidelines-narrowing-conversions
   <clang-tidy/checks/cppcoreguidelines-narrowing-conversions>` check now
   detects more narrowing conversions:
   - integer to narrower signed integer (this is compiler implementation defined),
   - integer - floating point narrowing conversions,
   - floating point - integer narrowing conversions,
   - constants with narrowing conversions (even in ternary operator).

 - The :doc:`objc-property-declaration
   <clang-tidy/checks/objc-property-declaration>` check now ignores the
   `Acronyms` and `IncludeDefaultAcronyms` options.

 Improvements to include-fixer
 -----------------------------

 The improvements are...

 Improvements to modularize
 --------------------------

 The improvements are...
	===================================================
	Extra Clang Tools 8.0.0 (In-Progress) Release Notes
	===================================================

	.. contents::
	:local:
	:depth: 3

	Written by the `LLVM Team <https://llvm.org/>`_

	.. warning::

	These are in-progress notes for the upcoming Extra Clang Tools 8 release.
	Release notes for previous releases can be found on
	`the Download Page <https://releases.llvm.org/download.html>`_.

	Introduction
	============

	This document contains the release notes for the Extra Clang Tools, part of the
	Clang release 8.0.0. 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 <https://llvm.org/releases/>`_.

	For more information about Clang or LLVM, including information about
	the latest release, please see the `Clang Web Site <https://clang.llvm.org>`_ or
	the `LLVM Web Site <https://llvm.org>`_.

	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 <https://llvm.org/releases/>`_.

	What's New in Extra Clang Tools 8.0.0?
	======================================

	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.

	Major New Features
	------------------

	...

	Improvements to clangd
	----------------------

	The improvements are...

	Improvements to clang-doc
	-------------------------

	The improvements are...

	Improvements to clang-query
	---------------------------

	The improvements are...

	Improvements to clang-rename
	----------------------------

	The improvements are...

	Improvements to clang-tidy
	--------------------------

	- New :doc:`abseil-duration-comparison
	<clang-tidy/checks/abseil-duration-comparison>` check.

	Checks for comparisons which should be done in the ``absl::Duration`` domain
	instead of the float of integer domains.

	- New :doc:`abseil-duration-division
	<clang-tidy/checks/abseil-duration-division>` check.

	Checks for uses of ``absl::Duration`` division that is done in a
	floating-point context, and recommends the use of a function that
	returns a floating-point value.

	- New :doc:`abseil-duration-factory-float
	<clang-tidy/checks/abseil-duration-factory-float>` check.

	Checks for cases where the floating-point overloads of various
	``absl::Duration`` factory functions are called when the more-efficient
	integer versions could be used instead.

	- New :doc:`abseil-duration-factory-scale
	<clang-tidy/checks/abseil-duration-factory-scale>` check.

	Checks for cases where arguments to ``absl::Duration`` factory functions are
	scaled internally and could be changed to a different factory function.

	- New :doc:`abseil-duration-subtraction
	<clang-tidy/checks/abseil-duration-subtraction>` check.

	Checks for cases where subtraction should be performed in the
	``absl::Duration`` domain.

	- New :doc:`abseil-faster-strsplit-delimiter
	<clang-tidy/checks/abseil-faster-strsplit-delimiter>` check.

	Finds instances of ``absl::StrSplit()`` or ``absl::MaxSplits()`` where the
	delimiter is a single character string literal and replaces with a character.

	- New :doc:`abseil-no-internal-dependencies
	<clang-tidy/checks/abseil-no-internal-dependencies>` check.

	Gives a warning if code using Abseil depends on internal details.

	- New :doc:`abseil-no-namespace
	<clang-tidy/checks/abseil-no-namespace>` check.

	Ensures code does not open ``namespace absl`` as that violates Abseil's
	compatibility guidelines.

	- New :doc:`abseil-redundant-strcat-calls
	<clang-tidy/checks/abseil-redundant-strcat-calls>` check.

	Suggests removal of unnecessary calls to ``absl::StrCat`` when the result is
	being passed to another ``absl::StrCat`` or ``absl::StrAppend``.

	- New :doc:`abseil-str-cat-append
	<clang-tidy/checks/abseil-str-cat-append>` check.

	Flags uses of ``absl::StrCat()`` to append to a ``std::string``. Suggests
	``absl::StrAppend()`` should be used instead.

	- New :doc:`abseil-upgrade-duration-conversions
	<clang-tidy/checks/abseil-upgrade-duration-conversions>` check.

	Finds calls to ``absl::Duration`` arithmetic operators and factories whose
	argument needs an explicit cast to continue compiling after upcoming API
	changes.

	- New :doc:`bugprone-too-small-loop-variable
	<clang-tidy/checks/bugprone-too-small-loop-variable>` check.

	Detects those ``for`` loops that have a loop variable with a "too small" type
	which means this type can't represent all values which are part of the
	iteration range.

	- New :doc:`cppcoreguidelines-macro-usage
	<clang-tidy/checks/cppcoreguidelines-macro-usage>` check.

	Finds macro usage that is considered problematic because better language
	constructs exist for the task.

	- New :doc:`google-objc-function-naming
	<clang-tidy/checks/google-objc-function-naming>` check.

	Checks that function names in function declarations comply with the naming
	conventions described in the Google Objective-C Style Guide.

	- New :doc:`misc-non-private-member-variables-in-classes
	<clang-tidy/checks/misc-non-private-member-variables-in-classes>` check.

	Finds classes that not only contain the data (non-static member variables),
	but also have logic (non-static member functions), and diagnoses all member
	variables that have any other scope other than ``private``.

	- New :doc:`modernize-avoid-c-arrays
	<clang-tidy/checks/modernize-avoid-c-arrays>` check.

	Finds C-style array types and recommend to use ``std::array<>`` /
	``std::vector<>``.

	- New :doc:`modernize-concat-nested-namespaces
	<clang-tidy/checks/modernize-concat-nested-namespaces>` check.

	Checks for uses of nested namespaces in the form of
	``namespace a { namespace b { ... }}`` and offers change to
	syntax introduced in C++17 standard: ``namespace a::b { ... }``.

	- New :doc:`modernize-deprecated-ios-base-aliases
	<clang-tidy/checks/modernize-deprecated-ios-base-aliases>` check.

	Detects usage of the deprecated member types of ``std::ios_base`` and replaces
	those that have a non-deprecated equivalent.

	- New :doc:`readability-isolate-decl
	<clang-tidy/checks/readability-isolate-declaration>` check.

	Detects local variable declarations declaring more than one variable and
	tries to refactor the code to one statement per declaration.

	- New :doc:`readability-const-return-type
	<clang-tidy/checks/readability-const-return-type>` check.

	Checks for functions with a ``const``-qualified return type and recommends
	removal of the ``const`` keyword.

	- New :doc:`readability-magic-numbers
	<clang-tidy/checks/readability-magic-numbers>` check.

	Detects usage of magic numbers, numbers that are used as literals instead of
	introduced via constants or symbols.

	- New :doc:`readability-uppercase-literal-suffix
	<clang-tidy/checks/readability-uppercase-literal-suffix>` check.

	Detects when the integral literal or floating point literal has non-uppercase
	suffix, and suggests to make the suffix uppercase. The list of destination
	suffixes can be optionally provided.

	- New alias :doc:`cert-dcl16-c
	<clang-tidy/checks/cert-dcl16-c>` to :doc:`readability-uppercase-literal-suffix
	<clang-tidy/checks/readability-uppercase-literal-suffix>`
	added.

	- New alias :doc:`cppcoreguidelines-avoid-c-arrays
	<clang-tidy/checks/cppcoreguidelines-avoid-c-arrays>`
	to :doc:`modernize-avoid-c-arrays
	<clang-tidy/checks/modernize-avoid-c-arrays>` added.

	- New alias :doc:`cppcoreguidelines-non-private-member-variables-in-classes
	<clang-tidy/checks/cppcoreguidelines-non-private-member-variables-in-classes>`
	to :doc:`misc-non-private-member-variables-in-classes
	<clang-tidy/checks/misc-non-private-member-variables-in-classes>`
	added.

	- New alias :doc:`hicpp-avoid-c-arrays
	<clang-tidy/checks/hicpp-avoid-c-arrays>`
	to :doc:`modernize-avoid-c-arrays
	<clang-tidy/checks/modernize-avoid-c-arrays>` added.

	- New alias :doc:`hicpp-uppercase-literal-suffix
	<clang-tidy/checks/hicpp-uppercase-literal-suffix>` to
	:doc:`readability-uppercase-literal-suffix
	<clang-tidy/checks/readability-uppercase-literal-suffix>`
	added.

	- The :doc:`readability-redundant-smartptr-get
	<clang-tidy/checks/readability-redundant-smartptr-get>` check does not warn
	about calls inside macros anymore by default.

	- The :doc:`cppcoreguidelines-narrowing-conversions
	<clang-tidy/checks/cppcoreguidelines-narrowing-conversions>` check now
	detects more narrowing conversions:
	- integer to narrower signed integer (this is compiler implementation defined),
	- integer - floating point narrowing conversions,
	- floating point - integer narrowing conversions,
	- constants with narrowing conversions (even in ternary operator).

	- The :doc:`objc-property-declaration
	<clang-tidy/checks/objc-property-declaration>` check now ignores the
	`Acronyms` and `IncludeDefaultAcronyms` options.

	Improvements to include-fixer
	-----------------------------

	The improvements are...

	Improvements to modularize
	--------------------------

	The improvements are...