2020-02-14 05:46:33 +08:00
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========================================
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2021-01-27 11:37:08 +08:00
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Clang 13.0.0 (In-Progress) Release Notes
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2020-02-14 05:46:33 +08:00
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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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.. warning::
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2021-01-27 11:37:08 +08:00
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These are in-progress notes for the upcoming Clang 13 release.
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2020-02-14 05:46:33 +08:00
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Release notes for previous releases can be found on
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`the Download Page <https://releases.llvm.org/download.html>`_.
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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 13.0.0. Here we
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2020-02-14 05:46:33 +08:00
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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>`_. All LLVM
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releases may be downloaded from the `LLVM releases web
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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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Note that if you are reading this file from a Git checkout or the
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main Clang web page, this document applies to the *next* release, not
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the current one. To see the release notes for a specific release, please
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see the `releases page <https://llvm.org/releases/>`_.
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2021-01-27 11:37:08 +08:00
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What's New in Clang 13.0.0?
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2020-02-14 05:46:33 +08:00
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===========================
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Some of the major new features and improvements to Clang are listed
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here. Generic improvements to Clang as a whole or to its underlying
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infrastructure are described first, followed by language-specific
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sections with improvements to Clang's support for those languages.
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Major New Features
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------------------
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- ...
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Improvements to Clang's diagnostics
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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2020-07-15 17:40:53 +08:00
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- ...
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2020-06-05 00:45:04 +08:00
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2020-02-14 05:46:33 +08:00
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Non-comprehensive list of changes in this release
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-------------------------------------------------
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- ...
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2020-05-26 02:44:35 +08:00
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2020-02-14 05:46:33 +08:00
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New Compiler Flags
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------------------
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2020-07-15 17:40:53 +08:00
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- ...
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2020-07-11 21:07:27 +08:00
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2020-02-14 05:46:33 +08:00
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Deprecated Compiler Flags
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-------------------------
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- ...
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Modified Compiler Flags
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-----------------------
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- ...
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2020-12-17 22:23:02 +08:00
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Removed Compiler Flags
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-------------------------
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2021-02-02 21:10:26 +08:00
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- The clang-cl ``/fallback`` flag, which made clang-cl invoke Microsoft Visual
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C++ on files it couldn't compile itself, has been removed.
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2020-02-14 05:46:33 +08:00
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New Pragmas in Clang
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--------------------
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- ...
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Attribute Changes in Clang
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--------------------------
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- ...
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Windows Support
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---------------
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C Language Changes in Clang
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---------------------------
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2020-03-03 01:33:14 +08:00
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- ...
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C++ Language Changes in Clang
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-----------------------------
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- ...
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C++1z Feature Support
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^^^^^^^^^^^^^^^^^^^^^
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...
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Objective-C Language Changes in Clang
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-------------------------------------
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OpenCL C Language Changes in Clang
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----------------------------------
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...
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ABI Changes in Clang
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--------------------
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OpenMP Support in Clang
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-----------------------
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CUDA Support in Clang
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---------------------
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2020-08-21 04:37:51 +08:00
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X86 Support in Clang
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--------------------
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- ...
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2020-10-30 12:58:05 +08:00
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2020-02-14 05:46:33 +08:00
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Internal API Changes
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--------------------
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These are major API changes that have happened since the 12.0.0 release of
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Clang. If upgrading an external codebase that uses Clang as a library,
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this section should help get you past the largest hurdles of upgrading.
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2020-07-15 17:40:53 +08:00
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- ...
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Removed a RecursiveASTVisitor feature to visit operator kinds with different methods
Summary:
This feature was only used in two places, but contributed a non-trivial
amount to the complexity of RecursiveASTVisitor, and was buggy (see my
recent patches where I was fixing the bugs that I noticed). I don't
think the convenience benefit of this feature is worth the complexity.
Besides complexity, another issue with the current state of
RecursiveASTVisitor is the non-uniformity in how it handles different
AST nodes. All AST nodes follow a regular pattern, but operators are
special -- and this special behavior not documented. Correct usage of
RecursiveASTVisitor relies on shadowing member functions with specific
names and signatures. Near misses don't cause any compile-time errors,
incorrectly named or typed methods are just silently ignored. Therefore,
predictability of RecursiveASTVisitor API is quite important.
This change reduces the size of the `clang` binary by 38 KB (0.2%) in
release mode, and by 7 MB (0.3%) in debug mode. The `clang-tidy` binary
is reduced by 205 KB (0.3%) in release mode, and by 5 MB (0.4%) in debug
mode. I don't think these code size improvements are significant enough
to justify this change on its own (for me, the primary motivation is
reducing code complexity), but they I think are a nice side-effect.
Reviewers: rsmith, sammccall, ymandel, aaron.ballman
Reviewed By: rsmith, sammccall, ymandel, aaron.ballman
Subscribers: cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D82921
2020-07-03 23:01:01 +08:00
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2020-02-14 05:46:33 +08:00
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Build System Changes
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--------------------
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2021-01-27 11:37:08 +08:00
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These are major changes to the build system that have happened since the 12.0.0
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release of Clang. Users of the build system should adjust accordingly.
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2020-07-15 17:40:53 +08:00
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- ...
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2020-02-14 05:46:33 +08:00
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AST Matchers
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------------
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2021-01-27 11:37:08 +08:00
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- ...
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2020-05-23 09:12:51 +08:00
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2020-02-14 05:46:33 +08:00
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clang-format
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------------
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2021-01-30 05:01:42 +08:00
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- Option ``SpacesInLineCommentPrefix`` has been added to control the
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number of spaces in a line comments prefix.
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2020-12-27 05:04:30 +08:00
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2021-02-02 21:41:55 +08:00
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- Option ``SortIncludes`` has been updated from a ``bool`` to an
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``enum`` with backwards compatibility. In addition to the previous
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``true``/``false`` states (now ``CaseInsensitive``/``Never``), a third
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state has been added (``CaseSensitive``) which causes an alphabetical sort
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with case used as a tie-breaker.
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.. code-block:: c++
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// Never (previously false)
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#include "B/A.h"
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#include "A/B.h"
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#include "a/b.h"
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#include "A/b.h"
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#include "B/a.h"
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// CaseInsensitive (previously true)
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#include "A/B.h"
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#include "A/b.h"
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#include "B/A.h"
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#include "B/a.h"
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#include "a/b.h"
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// CaseSensitive
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#include "A/B.h"
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#include "A/b.h"
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#include "a/b.h"
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#include "B/A.h"
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#include "B/a.h"
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2021-01-29 16:29:00 +08:00
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- ``BasedOnStyle: InheritParentConfig`` allows to use the ``.clang-format`` of
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the parent directories to overwrite only parts of it.
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2020-02-14 05:46:33 +08:00
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libclang
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--------
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- ...
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Static Analyzer
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---------------
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- ...
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.. _release-notes-ubsan:
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Undefined Behavior Sanitizer (UBSan)
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------------------------------------
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Core Analysis Improvements
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==========================
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- ...
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New Issues Found
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================
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- ...
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Python Binding Changes
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----------------------
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The following methods have been added:
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- ...
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Significant Known Problems
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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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2020-03-23 05:18:40 +08:00
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API documentation which are up-to-date with the Git version of
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2020-02-14 05:46:33 +08:00
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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 via the `mailing
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list <https://lists.llvm.org/mailman/listinfo/cfe-dev>`_.
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