forked from OSchip/llvm-project
68 lines
2.7 KiB
ReStructuredText
68 lines
2.7 KiB
ReStructuredText
=========================================
|
|
Libc++ 13.0.0 (In-Progress) Release Notes
|
|
=========================================
|
|
|
|
.. contents::
|
|
:local:
|
|
:depth: 2
|
|
|
|
Written by the `Libc++ Team <https://libcxx.llvm.org>`_
|
|
|
|
.. warning::
|
|
|
|
These are in-progress notes for the upcoming libc++ 13 release.
|
|
Release notes for previous releases can be found on
|
|
`the Download Page <https://releases.llvm.org/download.html>`_.
|
|
|
|
Introduction
|
|
============
|
|
|
|
This document contains the release notes for the libc++ C++ Standard Library,
|
|
part of the LLVM Compiler Infrastructure, release 13.0.0. Here we describe the
|
|
status of libc++ in some detail, including major improvements from the previous
|
|
release and new feature work. For the general LLVM release notes, see `the LLVM
|
|
documentation <https://llvm.org/docs/ReleaseNotes.html>`_. All LLVM releases may
|
|
be downloaded from the `LLVM releases web site <https://llvm.org/releases/>`_.
|
|
|
|
For more information about libc++, please see the `Libc++ Web Site
|
|
<https://libcxx.llvm.org>`_ or the `LLVM Web Site <https://llvm.org>`_.
|
|
|
|
Note that if you are reading this file from a Git checkout or the
|
|
main Libc++ 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 <https://llvm.org/releases/>`_.
|
|
|
|
What's New in Libc++ 13.0.0?
|
|
============================
|
|
|
|
New Features
|
|
------------
|
|
|
|
- ...
|
|
|
|
API Changes
|
|
-----------
|
|
|
|
- There has been several changes in the tuple constructors provided by libc++.
|
|
Those changes were made as part of an effort to regularize libc++'s tuple
|
|
implementation, which contained several subtle bugs due to these extensions.
|
|
If you notice a build breakage when initializing a tuple, make sure you
|
|
properly initialize all the tuple elements - this is probably the culprit.
|
|
|
|
In particular, the extension allowing tuples to be constructed from fewer
|
|
elements than the number of elements in the tuple (in which case the remaining
|
|
elements would be default-constructed) has been removed. See https://godbolt.org/z/sqozjd.
|
|
|
|
Also, the extension allowing a tuple to be constructed from an array has been
|
|
removed. See https://godbolt.org/z/5esqbW.
|
|
|
|
- The ``std::pointer_safety`` utility and related functions are not available
|
|
in C++03 anymore. Furthermore, in other standard modes, it has changed from
|
|
a struct to a scoped enumeration, which is an ABI break. Finally, the
|
|
``std::get_pointer_safety`` function was previously in the dylib, but it
|
|
is now defined as inline in the headers.
|
|
|
|
While this is technically both an API and an ABI break, we do not expect
|
|
``std::pointer_safety`` to have been used at all in real code, since we
|
|
never implemented the underlying support for garbage collection.
|