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