Libc++ 9 releases with explicit support for WebAssembly System Interface (WASI)

On Friday, Libc++ version 9 was released; libc++ is an implementation of the C++ standard library, targeting C++11, C++14 and above. Libc++ 9 is a part of the LLVM Compiler Infrastructure, release 9.0.0 which was made available in September. Libc++ 9 adds explicit support for WebAssembly System Interface (WASI) along with major improvements from the previous release and new feature work. Libc++ has also dropped support for GCC 4.9; they now support GCC 5.1 and above.

WASI is a system interface for the WebAssembly platform. Currently, it supports sandboxed access to the filesystem via a POSIX-like API, as well as other basic interfaces like argv, environment variables, random numbers, and timers. There are three popular implementations of WASI: wasmtime, Mozilla’s WebAssembly runtime, Lucet, Fastly’s WebAssembly runtime, and a browser polyfill.

Improvements in Libc ++ 9

• Minor fixes to std::chrono operators.
• libc++ now correctly handles Objective-C++ ARC qualifiers in std::is_pointer.
• Front and back methods are added to std::span
• std::to_chars now adds leading zeros.
• Ensure std::tuple is trivially constructible.
• std::aligned_union now works in C++03.
• Output of nullptr to std::basic_ostream is formatted properly.
• P0608 is now implemented as a sane variant converting constructor.
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• std::is_unbounded_array and std::is_bounded_array added to type traits.
• std::atomic now includes many new features and specialization
• Added std::midpoint and std::lerp math functions and std::is_constant_evaluated function
• Erase-like algorithms now return size type.
• Added contains method to container types.
• std::swap is now a constant expression.
• std::move and std::forward now both work in C++03 mode.

People on Twitter were quite happy with WASI support in libc ++

https://twitter.com/Stephen_d2005/status/1178489876070535168

https://twitter.com/iwillrunoutofsp/status/1182702301062008832

You can also see the release notes for additional information.

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