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=======================================
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Clang 6.0.0 (In-Progress) Release Notes
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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 <http://llvm.org/>`_
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.. warning::
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These are in-progress notes for the upcoming Clang 6 release.
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Release notes for previous releases can be found on
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`the Download Page <http://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 6.0.0. 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 <http://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 <http://llvm.org/releases/>`_.
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For more information about Clang or LLVM, including information about
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the latest release, please check out the main please see the `Clang Web
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Site <http://clang.llvm.org>`_ or the `LLVM Web
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Site <http://llvm.org>`_.
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Note that if you are reading this file from a Subversion 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 <http://llvm.org/releases/>`_.
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What's New in Clang 6.0.0?
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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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- ``-Wpragma-pack`` is a new warning that warns in the following cases:
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- When a translation unit is missing terminating ``#pragma pack (pop)``
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directives.
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- When leaving an included file that changes the current alignment value,
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i.e. when the alignment before ``#include`` is different to the alignment
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after ``#include``.
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- ``-Wpragma-pack-suspicious-include`` (disabled by default) warns on an
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``#include`` when the included file contains structures or unions affected by
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a non-default alignment that has been specified using a ``#pragma pack``
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directive prior to the ``#include``.
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Non-comprehensive list of changes in this release
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-------------------------------------------------
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- Bitrig OS was merged back into OpenBSD, so Bitrig support has been
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removed from Clang/LLVM.
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New Compiler Flags
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------------------
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- --autocomplete was implemented to obtain a list of flags and its arguments. This is used for shell autocompletion.
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Deprecated Compiler Flags
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-------------------------
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The following options are deprecated and ignored. They will be removed in
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future versions of Clang.
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- ...
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New Pragmas in Clang
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-----------------------
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Clang now supports the ...
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Attribute Changes in Clang
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--------------------------
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- The presence of __attribute__((availability(...))) on a declaration no longer
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implies default visibility for that declaration on macOS.
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- ...
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Windows Support
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---------------
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Clang's support for building native Windows programs ...
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C Language Changes in Clang
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---------------------------
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- ...
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...
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C11 Feature Support
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^^^^^^^^^^^^^^^^^^^
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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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...
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OpenCL C Language Changes in Clang
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----------------------------------
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...
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OpenMP Support in Clang
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----------------------------------
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...
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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 4.0.0 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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- ...
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AST Matchers
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------------
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The hasDeclaration matcher now works the same for Type and QualType and only
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ever looks through one level of sugaring in a limited number of cases.
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There are two main patterns affected by this:
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- qualType(hasDeclaration(recordDecl(...))): previously, we would look through
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sugar like TypedefType to get at the underlying recordDecl; now, we need
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to explicitly remove the sugaring:
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qualType(hasUnqualifiedDesugaredType(hasDeclaration(recordDecl(...))))
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- hasType(recordDecl(...)): hasType internally uses hasDeclaration; previously,
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this matcher used to match for example TypedefTypes of the RecordType, but
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after the change they don't; to fix, use:
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::
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hasType(hasUnqualifiedDesugaredType(
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recordType(hasDeclaration(recordDecl(...)))))
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- templateSpecializationType(hasDeclaration(classTemplateDecl(...))):
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previously, we would directly match the underlying ClassTemplateDecl;
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now, we can explicitly match the ClassTemplateSpecializationDecl, but that
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requires to explicitly get the ClassTemplateDecl:
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::
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templateSpecializationType(hasDeclaration(
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classTemplateSpecializationDecl(
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hasSpecializedTemplate(classTemplateDecl(...)))))
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clang-format
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------------
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...
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* Option -verbose added to the command line.
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Shows the list of processed files.
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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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Undefined Behavior Sanitizer (UBSan)
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------------------------------------
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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 <http://clang.llvm.org/>`_. The web page contains versions of the
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API documentation which are up-to-date with the Subversion 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 via the `mailing
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list <http://lists.llvm.org/mailman/listinfo/cfe-dev>`_.
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