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6f241e3683
In 377257f063c, elements of structured bindings are copy-initialized.
They should be direct-initialized because the form of the initializer of
the whole structured bindings is a direct-list-initialization.
> [dcl.struct.bind]/1:
> ... and each element is copy-initialized or direct-initialized from
the corresponding element of the assignment-expression as specified by
the form of the initializer. ...
For example,
```cpp
int arr[2]{};
// elements of `[a, b]` should be direct-initialized
auto [a, b]{arr};
```
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===========================================
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Clang |release| |ReleaseNotesTitle|
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===========================================
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.. contents::
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:local:
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:depth: 2
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Written by the `LLVM Team <https://llvm.org/>`_
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.. only:: PreRelease
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.. warning::
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These are in-progress notes for the upcoming Clang |version| release.
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Release notes for previous releases can be found on
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`the Releases Page <https://llvm.org/releases/>`_.
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Introduction
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============
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This document contains the release notes for the Clang C/C++/Objective-C
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frontend, part of the LLVM Compiler Infrastructure, release |release|. Here we
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describe the status of Clang in some detail, including major
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improvements from the previous release and new feature work. For the
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general LLVM release notes, see `the LLVM
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documentation <https://llvm.org/docs/ReleaseNotes.html>`_. For the libc++ release notes,
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see `this page <https://libcxx.llvm.org/ReleaseNotes.html>`_. All LLVM releases
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may be downloaded from the `LLVM releases web site <https://llvm.org/releases/>`_.
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For more information about Clang or LLVM, including information about the
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latest release, please see the `Clang Web Site <https://clang.llvm.org>`_ or the
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`LLVM Web Site <https://llvm.org>`_.
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Potentially Breaking Changes
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============================
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- The Objective-C ARC migrator (ARCMigrate) has been removed.
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C/C++ Language Potentially Breaking Changes
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-------------------------------------------
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C++ Specific Potentially Breaking Changes
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-----------------------------------------
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- The type trait builtin ``__is_referenceable`` has been removed, since it has
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very few users and all the type traits that could benefit from it in the
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standard library already have their own bespoke builtins.
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ABI Changes in This Version
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---------------------------
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- 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)
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AST Dumping Potentially Breaking Changes
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----------------------------------------
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Clang Frontend Potentially Breaking Changes
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-------------------------------------------
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Clang Python Bindings Potentially Breaking Changes
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--------------------------------------------------
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What's New in Clang |release|?
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==============================
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C++ Language Changes
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--------------------
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C++2c Feature Support
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^^^^^^^^^^^^^^^^^^^^^
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C++23 Feature Support
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^^^^^^^^^^^^^^^^^^^^^
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C++20 Feature Support
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^^^^^^^^^^^^^^^^^^^^^
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C++17 Feature Support
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^^^^^^^^^^^^^^^^^^^^^
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Resolutions to C++ Defect Reports
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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- The flag `-frelaxed-template-template-args`
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and its negation have been removed, having been deprecated since the previous
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two releases. The improvements to template template parameter matching implemented
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in the previous release, as described in P3310 and P3579, made this flag unnecessary.
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C Language Changes
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------------------
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- Clang now allows an ``inline`` specifier on a typedef declaration of a
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function type in Microsoft compatibility mode. #GH124869
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C2y Feature Support
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^^^^^^^^^^^^^^^^^^^
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C23 Feature Support
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^^^^^^^^^^^^^^^^^^^
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Non-comprehensive list of changes in this release
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-------------------------------------------------
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New Compiler Flags
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------------------
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Deprecated Compiler Flags
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-------------------------
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Modified Compiler Flags
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-----------------------
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Removed Compiler Flags
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-------------------------
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Attribute Changes in Clang
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--------------------------
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- The ``no_sanitize`` attribute now accepts both ``gnu`` and ``clang`` names.
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Improvements to Clang's diagnostics
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-----------------------------------
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- Improve the diagnostics for deleted default constructor errors for C++ class
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initializer lists that don't explicitly list a class member and thus attempt
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to implicitly default construct that member.
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- The ``-Wunique-object-duplication`` warning has been added to warn about objects
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which are supposed to only exist once per program, but may get duplicated when
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built into a shared library.
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- Fixed a bug where Clang's Analysis did not correctly model the destructor behavior of ``union`` members (#GH119415).
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Improvements to Clang's time-trace
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----------------------------------
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Improvements to Coverage Mapping
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--------------------------------
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Bug Fixes in This Version
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-------------------------
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Bug Fixes to Compiler Builtins
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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- The behvaiour of ``__add_pointer`` and ``__remove_pointer`` for Objective-C++'s ``id`` and interfaces has been fixed.
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Bug Fixes to Attribute Support
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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- Fixed crash when a parameter to the ``clang::annotate`` attribute evaluates to ``void``. See #GH119125
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Bug Fixes to C++ Support
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^^^^^^^^^^^^^^^^^^^^^^^^
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- Clang is now better at keeping track of friend function template instance contexts. (#GH55509)
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- The initialization kind of elements of structured bindings
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direct-list-initialized from an array is corrected to direct-initialization.
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Bug Fixes to AST Handling
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^^^^^^^^^^^^^^^^^^^^^^^^^
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Miscellaneous Bug Fixes
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^^^^^^^^^^^^^^^^^^^^^^^
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- HTML tags in comments that span multiple lines are now parsed correctly by Clang's comment parser. (#GH120843)
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Miscellaneous Clang Crashes Fixed
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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OpenACC Specific Changes
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------------------------
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Target Specific Changes
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-----------------------
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AMDGPU Support
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^^^^^^^^^^^^^^
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NVPTX Support
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^^^^^^^^^^^^^^
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Hexagon Support
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^^^^^^^^^^^^^^^
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- The default compilation target has been changed from V60 to V68.
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X86 Support
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^^^^^^^^^^^
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- Disable ``-m[no-]avx10.1`` and switch ``-m[no-]avx10.2`` to alias of 512 bit
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options.
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- Change ``-mno-avx10.1-512`` to alias of ``-mno-avx10.1-256`` to disable both
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256 and 512 bit instructions.
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Arm and AArch64 Support
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^^^^^^^^^^^^^^^^^^^^^^^
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Android Support
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^^^^^^^^^^^^^^^
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Windows Support
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^^^^^^^^^^^^^^^
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LoongArch Support
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^^^^^^^^^^^^^^^^^
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RISC-V Support
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^^^^^^^^^^^^^^
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CUDA/HIP Language Changes
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^^^^^^^^^^^^^^^^^^^^^^^^^
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CUDA Support
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^^^^^^^^^^^^
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AIX Support
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^^^^^^^^^^^
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NetBSD Support
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^^^^^^^^^^^^^^
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WebAssembly Support
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^^^^^^^^^^^^^^^^^^^
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AVR Support
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^^^^^^^^^^^
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DWARF Support in Clang
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----------------------
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Floating Point Support in Clang
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-------------------------------
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Fixed Point Support in Clang
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----------------------------
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AST Matchers
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------------
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clang-format
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------------
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- Adds ``BreakBeforeTemplateCloser`` option.
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- Adds ``BinPackLongBracedList`` option to override bin packing options in
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long (20 item or more) braced list initializer lists.
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libclang
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--------
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Code Completion
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---------------
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Static Analyzer
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---------------
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New features
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^^^^^^^^^^^^
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A new flag - `-static-libclosure` was introduced to support statically linking
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the runtime for the Blocks extension on Windows. This flag currently only
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changes the code generation, and even then, only on Windows. This does not
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impact the linker behaviour like the other `-static-*` flags.
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Crash and bug fixes
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^^^^^^^^^^^^^^^^^^^
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Improvements
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^^^^^^^^^^^^
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Moved checkers
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^^^^^^^^^^^^^^
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- After lots of improvements, the checker ``alpha.security.ArrayBoundV2`` is
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renamed to ``security.ArrayBound``. As this checker is stable now, the old
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checker ``alpha.security.ArrayBound`` (which was searching for the same kind
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of bugs with an different, simpler and less accurate algorithm) is removed.
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.. _release-notes-sanitizers:
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Sanitizers
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----------
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Python Binding Changes
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----------------------
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OpenMP Support
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--------------
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- Added support 'no_openmp_constructs' assumption clause.
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Improvements
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^^^^^^^^^^^^
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Additional Information
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======================
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A wide variety of additional information is available on the `Clang web
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page <https://clang.llvm.org/>`_. The web page contains versions of the
|
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API documentation which are up-to-date with the Git version of
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the source code. You can access versions of these documents specific to
|
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this release by going into the "``clang/docs/``" directory in the Clang
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tree.
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If you have any questions or comments about Clang, please feel free to
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contact us on the `Discourse forums (Clang Frontend category)
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<https://discourse.llvm.org/c/clang/6>`_.
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