Libc ++ 9.0.0 adds explicit support for WASI, Hacker News

Written by theLibc Team

Introduction ¶

This document contains the release notes for the libc C Standard Library, part of the LLVM Compiler Infrastructure, release 9.0.0. 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, seethe LLVM documentation. All LLVM releases may be downloaded from theLLVM releases web site.

For more information about libc , please see theLibc Web Siteor theLLVM Web Site.

What’s New in Libc 9.0.0?¶

Fixes ¶

Minor fixes tostd :: chronoOperators.
libc now correctly handles Objective-C ARC qualifiers instd :: is_pointer.
std :: spangeneral updates and fixes.
Updates to theSTD :: ABSimplementation.
std :: to_charsnow adds leading zeros.
Ensurestd :: tupleis trivially constructible.
std :: aligned_unionnow works in C 03.
Output of nullptr tostd :: basic_ostreamis formatted properly.

Features¶

Implemented P 0608: sane variant converting constructor.
Addedssizefunction.
Addedfrontandbackmethods instd :: span.
std :: is_unbounded_arrayandstd :: is_bounded_arrayadded to type traits.
std :: atomicnow includes many new features and specialization including improved Freestanding support.
Addedstd :: midpointandstd :: lerpmath functions.
Added the functionstd :: is_constant_evaluated.
Erase-like algorithms now return size type.
Addedcontainsmethod to container types.
std :: swapis now a constant expression.

Updates¶

libc dropped support for GCC 4.9; we now support GCC 5.1 and above.
libc added explicit support for WebAssembly System Interface (WASI).
Progress towards full support of rvalues and variadics in C 03 mode.std :: moveandstd :: forwardnow both work in C 03 Mode.