db8a389f88
When release notes were cleared on ``main``, there were some notes lost because the changes happened after the branch point for 21.x. This restores the lost notes.
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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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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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- For C++20 modules, the Reduced BMI mode will be the default option. This may introduce
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regressions if your build system supports two-phase compilation model but haven't support
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reduced BMI or it is a compiler bug or a bug in users code.
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ABI Changes in This Version
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---------------------------
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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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C Language Changes
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------------------
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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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- Added ``__builtin_elementwise_minnumnum`` and ``__builtin_elementwise_maxnumnum``.
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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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Improvements to Clang's diagnostics
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-----------------------------------
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- Added a separate diagnostic group ``-Wfunction-effect-redeclarations``, for the more pedantic
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diagnostics for function effects (``[[clang::nonblocking]]`` and ``[[clang::nonallocating]]``).
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Moved the warning for a missing (though implied) attribute on a redeclaration into this group.
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Added a new warning in this group for the case where the attribute is missing/implicit on
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an override of a virtual method.
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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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- Fix a crash when marco name is empty in ``#pragma push_macro("")`` or
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``#pragma pop_macro("")``. (#GH149762).
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Bug Fixes to Compiler Builtins
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Bug Fixes to Attribute Support
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Bug Fixes to C++ Support
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^^^^^^^^^^^^^^^^^^^^^^^^
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- Diagnose binding a reference to ``*nullptr`` during constant evaluation. (#GH48665)
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- Suppress ``-Wdeprecated-declarations`` in implicitly generated functions. (#GH147293)
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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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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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X86 Support
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^^^^^^^^^^^
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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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- Ensure ``hasBitWidth`` doesn't crash on bit widths that are dependent on template
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parameters.
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clang-format
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------------
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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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- The Clang Static Analyzer now handles parenthesized initialization.
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(#GH148875)
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New features
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^^^^^^^^^^^^
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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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.. _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 parsing and semantic analysis support for the ``need_device_addr``
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modifier in the ``adjust_args`` clause.
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- Allow array length to be omitted in array section subscript expression.
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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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