forked from OSchip/llvm-project
154 lines
5.1 KiB
ReStructuredText
154 lines
5.1 KiB
ReStructuredText
=====================================
|
|
Clang 3.3 (In-Progress) Release Notes
|
|
=====================================
|
|
|
|
.. contents::
|
|
:local:
|
|
:depth: 2
|
|
|
|
Written by the `LLVM Team <http://llvm.org/>`_
|
|
|
|
.. warning::
|
|
|
|
These are in-progress notes for the upcoming Clang 3.3 release. You may
|
|
prefer the `Clang 3.2 Release Notes
|
|
<http://llvm.org/releases/3.2/docs/ClangReleaseNotes.html>`_.
|
|
|
|
Introduction
|
|
============
|
|
|
|
This document contains the release notes for the Clang C/C++/Objective-C
|
|
frontend, part of the LLVM Compiler Infrastructure, release 3.3. Here we
|
|
describe the status of Clang in some detail, including major
|
|
improvements from the previous release and new feature work. For the
|
|
general LLVM release notes, see `the LLVM
|
|
documentation <http://llvm.org/docs/ReleaseNotes.html>`_. All LLVM
|
|
releases may be downloaded from the `LLVM releases web
|
|
site <http://llvm.org/releases/>`_.
|
|
|
|
For more information about Clang or LLVM, including information about
|
|
the latest release, please check out the main please see the `Clang Web
|
|
Site <http://clang.llvm.org>`_ or the `LLVM Web
|
|
Site <http://llvm.org>`_.
|
|
|
|
Note that if you are reading this file from a Subversion checkout or the
|
|
main Clang web page, this document applies to the *next* release, not
|
|
the current one. To see the release notes for a specific release, please
|
|
see the `releases page <http://llvm.org/releases/>`_.
|
|
|
|
What's New in Clang 3.3?
|
|
========================
|
|
|
|
Some of the major new features and improvements to Clang are listed
|
|
here. Generic improvements to Clang as a whole or to its underlying
|
|
infrastructure are described first, followed by language-specific
|
|
sections with improvements to Clang's support for those languages.
|
|
|
|
Major New Features
|
|
------------------
|
|
|
|
Improvements to Clang's diagnostics
|
|
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
Clang's diagnostics are constantly being improved to catch more issues,
|
|
explain them more clearly, and provide more accurate source information
|
|
about them. The improvements since the 3.2 release include:
|
|
|
|
- ...
|
|
|
|
Extended Identifiers: Unicode Support and Universal Character Names
|
|
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
Clang 3.3 includes support for *extended identifiers* in C99 and C++.
|
|
This feature allows identifiers to contain certain Unicode characters, as
|
|
specified by the active language standard; these characters can be written
|
|
directly in the source file using the UTF-8 encoding, or referred to using
|
|
*universal character names* (``\u00E0``, ``\U000000E0``).
|
|
|
|
New Compiler Flags
|
|
------------------
|
|
|
|
- ...
|
|
|
|
C Language Changes in Clang
|
|
---------------------------
|
|
|
|
C11 Feature Support
|
|
^^^^^^^^^^^^^^^^^^^
|
|
|
|
...
|
|
|
|
C++ Language Changes in Clang
|
|
-----------------------------
|
|
|
|
- Clang now correctly implements language linkage for functions and variables.
|
|
This means that, for example, it is now possible to overload static functions
|
|
declared in an ``extern "C"`` context. For backwards compatibility, an alias
|
|
with the unmangled name is still emitted if it is the only one and has the
|
|
``used`` attribute.
|
|
|
|
C++11 Feature Support
|
|
^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
...
|
|
|
|
Objective-C Language Changes in Clang
|
|
-------------------------------------
|
|
|
|
...
|
|
|
|
Internal API Changes
|
|
--------------------
|
|
|
|
These are major API changes that have happened since the 3.2 release of
|
|
Clang. If upgrading an external codebase that uses Clang as a library,
|
|
this section should help get you past the largest hurdles of upgrading.
|
|
|
|
Value Casting
|
|
^^^^^^^^^^^^^
|
|
|
|
Certain type hierarchies (TypeLoc, CFGElement, ProgramPoint, and SVal) were
|
|
misusing the llvm::cast machinery to perform undefined operations. Their APIs
|
|
have been changed to use two member function templates that return values
|
|
instead of pointers or references - "T castAs" and "Optional<T> getAs" (in the
|
|
case of the TypeLoc hierarchy the latter is "T getAs" and you can use the
|
|
boolean testability of a TypeLoc (or its 'validity') to verify that the cast
|
|
succeeded). Essentially all previous 'cast' usage should be replaced with
|
|
'castAs' and 'dyn_cast' should be replaced with 'getAs'. See r175462 for the
|
|
first example of such a change along with many examples of how code was
|
|
migrated to the new API.
|
|
|
|
Storage Class
|
|
^^^^^^^^^^^^^
|
|
|
|
For each variable and function Clang used to keep the storage class as written
|
|
in the source, the linkage and a semantic storage class. This was a bit
|
|
redundant and the semantic storage class has been removed. The method
|
|
getStorageClass now returns what is written it the source code for that decl.
|
|
|
|
...
|
|
|
|
Python Binding Changes
|
|
----------------------
|
|
|
|
The following methods have been added:
|
|
|
|
- ...
|
|
|
|
Significant Known Problems
|
|
==========================
|
|
|
|
Additional Information
|
|
======================
|
|
|
|
A wide variety of additional information is available on the `Clang web
|
|
page <http://clang.llvm.org/>`_. The web page contains versions of the
|
|
API documentation which are up-to-date with the Subversion version of
|
|
the source code. You can access versions of these documents specific to
|
|
this release by going into the "``clang/docs/``" directory in the Clang
|
|
tree.
|
|
|
|
If you have any questions or comments about Clang, please feel free to
|
|
contact us via the `mailing
|
|
list <http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev>`_.
|