Update docs version and clear release notes for 7.0.0
llvm-svn: 321728
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Hans Wennborg
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5bd4a66873
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=======================================
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Clang 6.0.0 (In-Progress) Release Notes
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Clang 7.0.0 (In-Progress) Release Notes
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=======================================
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.. contents::
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@ -10,7 +10,7 @@ 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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These are in-progress notes for the upcoming Clang 7 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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@ -18,7 +18,7 @@ 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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frontend, part of the LLVM Compiler Infrastructure, release 7.0.0. 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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@ -35,7 +35,7 @@ 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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What's New in Clang 7.0.0?
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==========================
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Some of the major new features and improvements to Clang are listed
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@ -51,86 +51,17 @@ Major New Features
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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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- ``-Wobjc-messaging-id`` is a new, non-default warning that warns about
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message sends to unqualified ``id`` in Objective-C. This warning is useful
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for projects that would like to avoid any potential future compiler
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errors/warnings, as the system frameworks might add a method with the same
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selector which could make the message send to ``id`` ambiguous.
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- ``-Wtautological-compare`` now warns when comparing an unsigned integer and 0
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regardless of whether the constant is signed or unsigned."
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- ``-Wtautological-compare`` now warns about comparing a signed integer and 0
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when the signed integer is coerced to an unsigned type for the comparison.
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``-Wsign-compare`` was adjusted not to warn in this case.
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- ``-Wtautological-constant-compare`` is a new warning that warns on
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tautological comparisons between integer variable of the type ``T`` and the
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largest/smallest possible integer constant of that same type.
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- For C code, ``-Wsign-compare``, ``-Wsign-conversion``,
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``-Wtautological-constant-compare`` and
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``-Wtautological-constant-out-of-range-compare`` were adjusted to use the
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underlying datatype of ``enum``.
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- ``-Wnull-pointer-arithmetic`` now warns about performing pointer arithmetic
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on a null pointer. Such pointer arithmetic has an undefined behavior if the
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offset is nonzero. It also now warns about arithmetic on a null pointer
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treated as a cast from integer to pointer (GNU extension).
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- ``-Wzero-as-null-pointer-constant`` was adjusted not to warn on null pointer
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constants that originate from system macros, except ``NULL`` macro.
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- ...
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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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- The default value of _MSC_VER was raised from 1800 to 1911, making it
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compatible with the Visual Studio 2015 and 2017 C++ standard library headers.
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Users should generally expect this to be regularly raised to match the most
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recently released version of the Visual C++ compiler.
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- clang now defaults to ``.init_array`` if no gcc installation can be found.
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If a gcc installation is found, it still prefers ``.ctors`` if the found
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gcc is older than 4.7.0.
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- The new builtin preprocessor macros ``__is_target_arch``,
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``__is_target_vendor``, ``__is_target_os``, and ``__is_target_environment``
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can be used to to examine the individual components of the target triple.
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- ...
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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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- The ``-fdouble-square-bracket-attributes`` and corresponding
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``-fno-double-square-bracket-attributes`` flags were added to enable or
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disable [[]] attributes in any language mode. Currently, only a limited
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number of attributes are supported outside of C++ mode. See the Clang
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attribute documentation for more information about which attributes are
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supported for each syntax.
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- Added the ``-std=c17``, ``-std=gnu17``, and ``-std=iso9899:2017`` language
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mode flags for compatibility with GCC. This enables support for the next
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version of the C standard, expected to be published by ISO in 2018. The only
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difference between the ``-std=c17`` and ``-std=c11`` language modes is the
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value of the ``__STDC_VERSION__`` macro, as C17 is a bug fix release.
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- ...
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Deprecated Compiler Flags
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-------------------------
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@ -149,20 +80,6 @@ Clang now supports the ...
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Attribute Changes in Clang
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--------------------------
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- Clang now supports the majority of its attributes under both the GNU-style
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spelling (``__attribute((name))``) and the double square-bracket spelling
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in the ``clang`` vendor namespace (``[[clang::name]]``). Attributes whose
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syntax is specified by some other standard (such as CUDA and OpenCL
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attributes) continue to follow their respective specification.
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- Added the ``__has_c_attribute()`` builtin preprocessor macro which allows
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users to dynamically detect whether a double square-bracket attribute is
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supported in C mode. This attribute syntax can be enabled with the
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``-fdouble-square-bracket-attributes`` flag.
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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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@ -186,10 +103,7 @@ C11 Feature Support
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C++ Language Changes in Clang
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-----------------------------
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- Clang's default C++ dialect is now ``gnu++14`` instead of ``gnu++98``. This
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means Clang will by default accept code using features from C++14 and
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conforming GNU extensions. Projects incompatible with C++14 can add
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``-std=gnu++98`` to their build settings to restore the previous behaviour.
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- ...
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C++1z Feature Support
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^^^^^^^^^^^^^^^^^^^^^
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@ -209,23 +123,12 @@ OpenCL C Language Changes in Clang
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OpenMP Support in Clang
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----------------------------------
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- Added options `-f[no]-openmp-simd` that support code emission only foe OpenMP
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SIMD-based directives, like `#pragma omp simd`, `#pragma omp parallel for simd`
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etc. The code is emitted only for simd-based part of the combined directives
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and clauses.
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- Added support for almost all target-based directives except for
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`#pragma omp target teams distribute parallel for [simd]`. Although, please
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note that `depend` clauses on target-based directives are not supported yet.
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Clang supports offloading to X86_64, AArch64 and PPC64[LE] devices.
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- Added support for `reduction`-based clauses on `task`-based directives from
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upcoming OpenMP 5.0.
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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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These are major API changes that have happened since the 6.0.0 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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@ -234,67 +137,12 @@ this section should help get you past the largest hurdles of upgrading.
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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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- ...
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clang-format
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------------
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* Option *IndentPPDirectives* added to indent preprocessor directives on
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conditionals.
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+----------------------+----------------------+
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| Before | After |
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+======================+======================+
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| .. code-block:: c++ | .. code-block:: c++ |
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| | |
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| #if FOO | #if FOO |
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| #if BAR | # if BAR |
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| #include <foo> | # include <foo> |
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| #endif | # endif |
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| #endif | #endif |
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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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* Option *IncludeBlocks* added to merge and regroup multiple ``#include`` blocks during sorting.
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+-------------------------+-------------------------+-------------------------+
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| Before (Preserve) | Merge | Regroup |
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+=========================+=========================+=========================+
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| .. code-block:: c++ | .. code-block:: c++ | .. code-block:: c++ |
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| | | |
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| #include "b.h" | #include "a.h" | #include "a.h" |
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| | #include "b.h" | #include "b.h" |
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| #include "a.b" | #include <lib/main.h> | |
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| #include <lib/main.h> | | #include <lib/main.h> |
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+-------------------------+-------------------------+-------------------------+
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- ...
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libclang
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--------
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@ -305,18 +153,14 @@ libclang
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Static Analyzer
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---------------
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- Static Analyzer can now properly detect and diagnose unary pre-/post-
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increment/decrement on an uninitialized value.
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- ...
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...
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Undefined Behavior Sanitizer (UBSan)
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------------------------------------
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* A minimal runtime is now available. It is suitable for use in production
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environments, and has a small attack surface. It only provides very basic
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issue logging and deduplication, and does not support ``-fsanitize=vptr``
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checking.
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* ...
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Core Analysis Improvements
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==========================
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@ -49,9 +49,9 @@ copyright = u'2007-%d, The Clang Team' % date.today().year
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# built documents.
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#
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# The short version.
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version = '6'
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version = '7'
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# The full version, including alpha/beta/rc tags.
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release = '6'
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release = '7'
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# The language for content autogenerated by Sphinx. Refer to documentation
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# for a list of supported languages.
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