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RELEASES.md

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27.0.0

Released 2024-11-20.

Added

  • Support for the Wasm GC proposal is now complete. A new "null" GC has been also added which does not ever collect garbage. #9389 #9392 #9401 #9435 #9437 #9438 #9446 #9448 #9454 #9455 #9484

  • Unstable WIT APIs now have feature gates configured at link-time and new -Scli-exit-with-code / -Snetwork-error-code options are available as well. #9381 #9276

  • Initial support for the wide-arithmetic proposal has been implemented. #9403 #9500

  • Guests on s390x now implement the "inline probestacks" for Cranelift to more robustly detect stack overflows. #9423

  • Missing CLI options for the pooling allocator have been filled out. #9447

  • Cranelift now supports 128-bit atomics on x64. #9459

  • A new Cargo feature has been added to the wasmtime crate to reexport the wasmparser dependency. #9485

  • Support for a new PyTorch backend for wasi-nn has been added. #9234

  • A new -Cnative-unwind-info flag has been added to the wasmtime CLI. #9494

  • Initial support for illumos has been added. #9535

  • A new Caller::get_module_export API has been added. #9525

  • Basic debug logging has been added to the debug info transformatino. #9526

Changed

  • The WASI WITs vendored are now updated to 0.2.2. #9395

  • The wasmtime-wasi-runtime-config is now named wasmtime-wasi-config. #9404

  • Documentation on the implementation status of WebAssembly proposals has been updated. #9434

  • Wasmtime's WASI documentation has been overhauled. #9471

  • The wasi_config_preopen_dir in Wasmtime's C API now takes file/directory permissions. #9477

  • Detection of libunwind vs libgcc is now done with weak symbols. #9479

  • Winch has improved detection of unsupported features in a Config. #9490

  • Winch now supports fuel-based interruption. #9472

  • Wasmtime's minimum supported Rust version is now 1.80. #9496

  • ISLE no longer supports scheme-style booleans. #9522

  • ISLE now supports block comments. #9529

  • Support for shared memory in the C API has been added. #9507

  • Configuration options for guard size regions have been merged into a single option. #9528

Fixed

  • Double-registration of debug information for modules in components has been fixed. #9470

  • A panic on AArch64 for vector constants has been fixed. #9482

  • A miscompile with sdiv and INT_MIN / -1 has been fixed on aarch64. #9541

Release notes for previous releases of Wasmtime can be found on the respective release branches of the Wasmtime repository.