clang/docs/ReleaseNotes.rst - external/github.com/llvm/llvm-project.git - Git at Google

 ===========================================
 Clang |release| |ReleaseNotesTitle|
 ===========================================

 .. contents::
    :local:
    :depth: 2

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

 .. only:: PreRelease

   .. warning::
      These are in-progress notes for the upcoming Clang |version| release.
      Release notes for previous releases can be found on
      `the Releases Page <https://llvm.org/releases/>`_.

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

 This document contains the release notes for the Clang C/C++/Objective-C
 frontend, part of the LLVM Compiler Infrastructure, release |release|. Here we
 describe the status of Clang in some detail, including major
 improvements from the previous release and new feature work. For the
 general LLVM release notes, see `the LLVM
 documentation <https://llvm.org/docs/ReleaseNotes.html>`_. For the libc++ release notes,
 see `this page <https://libcxx.llvm.org/ReleaseNotes.html>`_. 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>`_.

 Potentially Breaking Changes
 ============================

 - The Objective-C ARC migrator (ARCMigrate) has been removed.

 C/C++ Language Potentially Breaking Changes
 -------------------------------------------

 C++ Specific Potentially Breaking Changes
 -----------------------------------------

 - The type trait builtin ``__is_referenceable`` has been removed, since it has
   very few users and all the type traits that could benefit from it in the
   standard library already have their own bespoke builtins.

 ABI Changes in This Version
 ---------------------------

 - Return larger CXX records in memory instead of using AVX registers. Code compiled with older clang will be incompatible with newer version of the clang unless -fclang-abi-compat=20 is provided. (#GH120670)

 AST Dumping Potentially Breaking Changes
 ----------------------------------------

 Clang Frontend Potentially Breaking Changes
 -------------------------------------------

 Clang Python Bindings Potentially Breaking Changes
 --------------------------------------------------

 What's New in Clang |release|?
 ==============================

 C++ Language Changes
 --------------------

 C++2c Feature Support
 ^^^^^^^^^^^^^^^^^^^^^

 C++23 Feature Support
 ^^^^^^^^^^^^^^^^^^^^^

 C++20 Feature Support
 ^^^^^^^^^^^^^^^^^^^^^

 C++17 Feature Support
 ^^^^^^^^^^^^^^^^^^^^^

 Resolutions to C++ Defect Reports
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

 - The flag `-frelaxed-template-template-args`
   and its negation have been removed, having been deprecated since the previous
   two releases. The improvements to template template parameter matching implemented
   in the previous release, as described in P3310 and P3579, made this flag unnecessary.

 C Language Changes
 ------------------

 - Clang now allows an ``inline`` specifier on a typedef declaration of a
   function type in Microsoft compatibility mode. #GH124869

 C2y Feature Support
 ^^^^^^^^^^^^^^^^^^^

 C23 Feature Support
 ^^^^^^^^^^^^^^^^^^^

 Non-comprehensive list of changes in this release
 -------------------------------------------------

 New Compiler Flags
 ------------------

 Deprecated Compiler Flags
 -------------------------

 Modified Compiler Flags
 -----------------------

 Removed Compiler Flags
 -------------------------

 Attribute Changes in Clang
 --------------------------

 - The ``no_sanitize`` attribute now accepts both ``gnu`` and ``clang`` names.

 Improvements to Clang's diagnostics
 -----------------------------------

 - Improve the diagnostics for deleted default constructor errors for C++ class
   initializer lists that don't explicitly list a class member and thus attempt
   to implicitly default construct that member.
 - The ``-Wunique-object-duplication`` warning has been added to warn about objects
   which are supposed to only exist once per program, but may get duplicated when
   built into a shared library.

 Improvements to Clang's time-trace
 ----------------------------------

 Improvements to Coverage Mapping
 --------------------------------

 Bug Fixes in This Version
 -------------------------

 Bug Fixes to Compiler Builtins
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

 - The behvaiour of ``__add_pointer`` and ``__remove_pointer`` for Objective-C++'s ``id`` and interfaces has been fixed.

 Bug Fixes to Attribute Support
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  - Fixed crash when a parameter to the ``clang::annotate`` attribute evaluates to ``void``. See #GH119125

 Bug Fixes to C++ Support
 ^^^^^^^^^^^^^^^^^^^^^^^^

 - Clang is now better at keeping track of friend function template instance contexts. (#GH55509)

 Bug Fixes to AST Handling
 ^^^^^^^^^^^^^^^^^^^^^^^^^

 Miscellaneous Bug Fixes
 ^^^^^^^^^^^^^^^^^^^^^^^

 - HTML tags in comments that span multiple lines are now parsed correctly by Clang's comment parser. (#GH120843)

 Miscellaneous Clang Crashes Fixed
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

 OpenACC Specific Changes
 ------------------------

 Target Specific Changes
 -----------------------

 AMDGPU Support
 ^^^^^^^^^^^^^^

 NVPTX Support
 ^^^^^^^^^^^^^^

 Hexagon Support
 ^^^^^^^^^^^^^^^

 -  The default compilation target has been changed from V60 to V68.

 X86 Support
 ^^^^^^^^^^^

 - Disable ``-m[no-]avx10.1`` and switch ``-m[no-]avx10.2`` to alias of 512 bit
   options.
 - Change ``-mno-avx10.1-512`` to alias of ``-mno-avx10.1-256`` to disable both
   256 and 512 bit instructions.

 Arm and AArch64 Support
 ^^^^^^^^^^^^^^^^^^^^^^^

 Android Support
 ^^^^^^^^^^^^^^^

 Windows Support
 ^^^^^^^^^^^^^^^

 LoongArch Support
 ^^^^^^^^^^^^^^^^^

 RISC-V Support
 ^^^^^^^^^^^^^^

 CUDA/HIP Language Changes
 ^^^^^^^^^^^^^^^^^^^^^^^^^

 CUDA Support
 ^^^^^^^^^^^^

 AIX Support
 ^^^^^^^^^^^

 NetBSD Support
 ^^^^^^^^^^^^^^

 WebAssembly Support
 ^^^^^^^^^^^^^^^^^^^

 AVR Support
 ^^^^^^^^^^^

 DWARF Support in Clang
 ----------------------

 Floating Point Support in Clang
 -------------------------------

 Fixed Point Support in Clang
 ----------------------------

 AST Matchers
 ------------

 clang-format
 ------------

 - Adds ``BreakBeforeTemplateCloser`` option.

 libclang
 --------

 Code Completion
 ---------------

 Static Analyzer
 ---------------

 New features
 ^^^^^^^^^^^^

 A new flag - `-static-libclosure` was introduced to support statically linking
 the runtime for the Blocks extension on Windows. This flag currently only
 changes the code generation, and even then, only on Windows. This does not
 impact the linker behaviour like the other `-static-*` flags.

 Crash and bug fixes
 ^^^^^^^^^^^^^^^^^^^

 Improvements
 ^^^^^^^^^^^^

 Moved checkers
 ^^^^^^^^^^^^^^

 .. _release-notes-sanitizers:

 Sanitizers
 ----------

 Python Binding Changes
 ----------------------

 OpenMP Support
 --------------

 Improvements
 ^^^^^^^^^^^^

 Additional Information
 ======================

 A wide variety of additional information is available on the `Clang web
 page <https://clang.llvm.org/>`_. The web page contains versions of the
 API documentation which are up-to-date with the Git version of
 the source code. You can access versions of these documents specific to
 this release by going into the "``clang/docs/``" directory in the Clang
 tree.

 If you have any questions or comments about Clang, please feel free to
 contact us on the `Discourse forums (Clang Frontend category)
 <https://discourse.llvm.org/c/clang/6>`_.
	===========================================
	Clang \|release\| \|ReleaseNotesTitle\|
	===========================================

	.. contents::
	:local:
	:depth: 2

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

	.. only:: PreRelease

	.. warning::
	These are in-progress notes for the upcoming Clang \|version\| release.
	Release notes for previous releases can be found on
	`the Releases Page <https://llvm.org/releases/>`_.

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

	This document contains the release notes for the Clang C/C++/Objective-C
	frontend, part of the LLVM Compiler Infrastructure, release \|release\|. Here we
	describe the status of Clang in some detail, including major
	improvements from the previous release and new feature work. For the
	general LLVM release notes, see `the LLVM
	documentation <https://llvm.org/docs/ReleaseNotes.html>`_. For the libc++ release notes,
	see `this page <https://libcxx.llvm.org/ReleaseNotes.html>`_. 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>`_.

	Potentially Breaking Changes
	============================

	- The Objective-C ARC migrator (ARCMigrate) has been removed.

	C/C++ Language Potentially Breaking Changes
	-------------------------------------------

	C++ Specific Potentially Breaking Changes
	-----------------------------------------

	- The type trait builtin ``__is_referenceable`` has been removed, since it has
	very few users and all the type traits that could benefit from it in the
	standard library already have their own bespoke builtins.

	ABI Changes in This Version
	---------------------------

	- Return larger CXX records in memory instead of using AVX registers. Code compiled with older clang will be incompatible with newer version of the clang unless -fclang-abi-compat=20 is provided. (#GH120670)

	AST Dumping Potentially Breaking Changes
	----------------------------------------

	Clang Frontend Potentially Breaking Changes
	-------------------------------------------

	Clang Python Bindings Potentially Breaking Changes
	--------------------------------------------------

	What's New in Clang \|release\|?
	==============================

	C++ Language Changes
	--------------------

	C++2c Feature Support
	^^^^^^^^^^^^^^^^^^^^^

	C++23 Feature Support
	^^^^^^^^^^^^^^^^^^^^^

	C++20 Feature Support
	^^^^^^^^^^^^^^^^^^^^^

	C++17 Feature Support
	^^^^^^^^^^^^^^^^^^^^^

	Resolutions to C++ Defect Reports
	^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

	- The flag `-frelaxed-template-template-args`
	and its negation have been removed, having been deprecated since the previous
	two releases. The improvements to template template parameter matching implemented
	in the previous release, as described in P3310 and P3579, made this flag unnecessary.

	C Language Changes
	------------------

	- Clang now allows an ``inline`` specifier on a typedef declaration of a
	function type in Microsoft compatibility mode. #GH124869

	C2y Feature Support
	^^^^^^^^^^^^^^^^^^^

	C23 Feature Support
	^^^^^^^^^^^^^^^^^^^

	Non-comprehensive list of changes in this release
	-------------------------------------------------

	New Compiler Flags
	------------------

	Deprecated Compiler Flags
	-------------------------

	Modified Compiler Flags
	-----------------------

	Removed Compiler Flags
	-------------------------

	Attribute Changes in Clang
	--------------------------

	- The ``no_sanitize`` attribute now accepts both ``gnu`` and ``clang`` names.

	Improvements to Clang's diagnostics
	-----------------------------------

	- Improve the diagnostics for deleted default constructor errors for C++ class
	initializer lists that don't explicitly list a class member and thus attempt
	to implicitly default construct that member.
	- The ``-Wunique-object-duplication`` warning has been added to warn about objects
	which are supposed to only exist once per program, but may get duplicated when
	built into a shared library.

	Improvements to Clang's time-trace
	----------------------------------

	Improvements to Coverage Mapping
	--------------------------------

	Bug Fixes in This Version
	-------------------------

	Bug Fixes to Compiler Builtins
	^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

	- The behvaiour of ``__add_pointer`` and ``__remove_pointer`` for Objective-C++'s ``id`` and interfaces has been fixed.

	Bug Fixes to Attribute Support
	^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
	- Fixed crash when a parameter to the ``clang::annotate`` attribute evaluates to ``void``. See #GH119125

	Bug Fixes to C++ Support
	^^^^^^^^^^^^^^^^^^^^^^^^

	- Clang is now better at keeping track of friend function template instance contexts. (#GH55509)

	Bug Fixes to AST Handling
	^^^^^^^^^^^^^^^^^^^^^^^^^

	Miscellaneous Bug Fixes
	^^^^^^^^^^^^^^^^^^^^^^^

	- HTML tags in comments that span multiple lines are now parsed correctly by Clang's comment parser. (#GH120843)

	Miscellaneous Clang Crashes Fixed
	^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

	OpenACC Specific Changes
	------------------------

	Target Specific Changes
	-----------------------

	AMDGPU Support
	^^^^^^^^^^^^^^

	NVPTX Support
	^^^^^^^^^^^^^^

	Hexagon Support
	^^^^^^^^^^^^^^^

	- The default compilation target has been changed from V60 to V68.

	X86 Support
	^^^^^^^^^^^

	- Disable ``-m[no-]avx10.1`` and switch ``-m[no-]avx10.2`` to alias of 512 bit
	options.
	- Change ``-mno-avx10.1-512`` to alias of ``-mno-avx10.1-256`` to disable both
	256 and 512 bit instructions.

	Arm and AArch64 Support
	^^^^^^^^^^^^^^^^^^^^^^^

	Android Support
	^^^^^^^^^^^^^^^

	Windows Support
	^^^^^^^^^^^^^^^

	LoongArch Support
	^^^^^^^^^^^^^^^^^

	RISC-V Support
	^^^^^^^^^^^^^^

	CUDA/HIP Language Changes
	^^^^^^^^^^^^^^^^^^^^^^^^^

	CUDA Support
	^^^^^^^^^^^^

	AIX Support
	^^^^^^^^^^^

	NetBSD Support
	^^^^^^^^^^^^^^

	WebAssembly Support
	^^^^^^^^^^^^^^^^^^^

	AVR Support
	^^^^^^^^^^^

	DWARF Support in Clang
	----------------------

	Floating Point Support in Clang
	-------------------------------

	Fixed Point Support in Clang
	----------------------------

	AST Matchers
	------------

	clang-format
	------------

	- Adds ``BreakBeforeTemplateCloser`` option.

	libclang
	--------

	Code Completion
	---------------

	Static Analyzer
	---------------

	New features
	^^^^^^^^^^^^

	A new flag - `-static-libclosure` was introduced to support statically linking
	the runtime for the Blocks extension on Windows. This flag currently only
	changes the code generation, and even then, only on Windows. This does not
	impact the linker behaviour like the other `-static-*` flags.

	Crash and bug fixes
	^^^^^^^^^^^^^^^^^^^

	Improvements
	^^^^^^^^^^^^

	Moved checkers
	^^^^^^^^^^^^^^

	.. _release-notes-sanitizers:

	Sanitizers
	----------

	Python Binding Changes
	----------------------

	OpenMP Support
	--------------

	Improvements
	^^^^^^^^^^^^

	Additional Information
	======================

	A wide variety of additional information is available on the `Clang web
	page <https://clang.llvm.org/>`_. The web page contains versions of the
	API documentation which are up-to-date with the Git version of
	the source code. You can access versions of these documents specific to
	this release by going into the "``clang/docs/``" directory in the Clang
	tree.

	If you have any questions or comments about Clang, please feel free to
	contact us on the `Discourse forums (Clang Frontend category)
	<https://discourse.llvm.org/c/clang/6>`_.