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Libc++ 8.0.0 (In-Progress) Release Notes
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Written by the `Libc++ Team <>`_
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These are in-progress notes for the upcoming libc++ 8 release.
Release notes for previous releases can be found on
`the Download Page <>`_.
This document contains the release notes for the libc++ C++ Standard Library,
part of the LLVM Compiler Infrastructure, release 8.0.0. 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 <>`_. All LLVM releases may
be downloaded from the `LLVM releases web site <>`_.
For more information about libc++, please see the `Libc++ Web Site
<>`_ or the `LLVM Web Site <>`_.
Note that if you are reading this file from a Subversion 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 <>`_.
What's New in Libc++ 8.0.0?
New Features
API Changes
- Building libc++ for Mac OSX 10.6 is not supported anymore.
- Starting with LLVM 8.0.0, users that wish to link together translation units
built with different versions of libc++'s headers into the same final linked
image MUST define the _LIBCPP_HIDE_FROM_ABI_PER_TU macro to 1 when building
those translation units. Not defining _LIBCPP_HIDE_FROM_ABI_PER_TU to 1 and
linking translation units built with different versions of libc++'s headers
together may lead to ODR violations and ABI issues. On the flipside, code
size improvements should be expected for everyone not defining the macro.