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@@ -1,5 +1,5 @@
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========================================
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Libc++ 8.0.0 (In-Progress) Release Notes
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Libc++ 9.0.0 (In-Progress) Release Notes
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========================================
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.. contents::
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@@ -10,7 +10,7 @@ Written by the `Libc++ Team <https://libcxx.llvm.org>`_
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.. warning::
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These are in-progress notes for the upcoming libc++ 8 release.
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These are in-progress notes for the upcoming libc++ 9 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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@@ -18,7 +18,7 @@ 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 8.0.0. Here we describe the
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part of the LLVM Compiler Infrastructure, release 9.0.0. 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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@@ -32,7 +32,7 @@ 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++ 8.0.0?
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What's New in Libc++ 9.0.0?
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===========================
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New Features
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@@ -40,23 +40,4 @@ New Features
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API Changes
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-----------
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- Building libc++ for Mac OSX 10.6 is not supported anymore.
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- Starting with LLVM 8.0.0, users that wish to link together translation units
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built with different versions of libc++'s headers into the same final linked
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image MUST define the _LIBCPP_HIDE_FROM_ABI_PER_TU macro to 1 when building
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those translation units. Not defining _LIBCPP_HIDE_FROM_ABI_PER_TU to 1 and
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linking translation units built with different versions of libc++'s headers
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together may lead to ODR violations and ABI issues. On the flipside, code
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size improvements should be expected for everyone not defining the macro.
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- Starting with LLVM 8.0.0, std::dynarray has been removed from the library.
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std::dynarray was a feature proposed for C++14 that was pulled from the
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Standard at the last minute and was never standardized. Since there are no
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plans to standardize this facility it is being removed.
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- Starting with LLVM 8.0.0, std::bad_array_length has been removed from the
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library. std::bad_array_length was a feature proposed for C++14 alongside
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std::dynarray, but it never actually made it into the C++ Standard. There
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are no plans to standardize this feature at this time. Formally speaking,
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this removal constitutes an ABI break because the symbols were shipped in
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the shared library. However, on macOS systems, the feature was not usable
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because it was hidden behind availability annotations. We do not expect
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any actual breakage to happen from this change.
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- ...
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Hans Wennborg