Add release notes for 24.0.0 (#9120)

Author: alexcrichton

RELEASES.md

@@ -4,8 +4,103 @@ Unreleased.
 
 ### Added
 
+* A new `wasmtime_engine_clone` function was added to the C API.
+  [#8907](https://github.com/bytecodealliance/wasmtime/pull/8907)
+
+* Wasmtime now has basic support for allocating a `StructRef` in the embedder
+  API.
+  [#8933](https://github.com/bytecodealliance/wasmtime/pull/8933)
+
+* The `wasmtime run` subcommand now support a `--argv0` flag indicating the
+  value of the first element to arguments reported to wasm if it shouldn't be
+  the default of the wasm binary name itself.
+  [#8961](https://github.com/bytecodealliance/wasmtime/pull/8961)
+
+* Support for Winch on AArch64 continued to improve.
+  [#8921](https://github.com/bytecodealliance/wasmtime/pull/8921)
+  [#9018](https://github.com/bytecodealliance/wasmtime/pull/9018)
+  [#9033](https://github.com/bytecodealliance/wasmtime/pull/9033)
+  [#9051](https://github.com/bytecodealliance/wasmtime/pull/9051)
+
+* An initial implementation of the `wasi-runtime-config` proposal was added to
+  Wasmtime.
+  [#8950](https://github.com/bytecodealliance/wasmtime/pull/8950)
+  [#8970](https://github.com/bytecodealliance/wasmtime/pull/8970)
+  [#8981](https://github.com/bytecodealliance/wasmtime/pull/8981)
+
+* Initial support for f16 and f128 in Cranelift continued to improve.
+  [#8893](https://github.com/bytecodealliance/wasmtime/pull/8893)
+  [#9045](https://github.com/bytecodealliance/wasmtime/pull/9045)
+
+* More types in `wasmtime-wasi-http` implement the `Debug` trait.
+  [#8979](https://github.com/bytecodealliance/wasmtime/pull/8979)
+
+* The `wasmtime explore` subcommand now supports exploring CLIF too.
+  [#8972](https://github.com/bytecodealliance/wasmtime/pull/8972)
+
+* Support for SIMD in Winch has begun, but it is not complete yet.
+  [#8990](https://github.com/bytecodealliance/wasmtime/pull/8990)
+  [#9006](https://github.com/bytecodealliance/wasmtime/pull/9006)
+
+* Initial work on Pulley, an interpreter for Wasmtime, has begun.
+  [#9008](https://github.com/bytecodealliance/wasmtime/pull/9008)
+  [#9013](https://github.com/bytecodealliance/wasmtime/pull/9013)
+  [#9014](https://github.com/bytecodealliance/wasmtime/pull/9014)
+
+* The `-Wunknown-imports-trap` flag to `wasmtime run` now supports components.
+  [#9021](https://github.com/bytecodealliance/wasmtime/pull/9021)
+
+* An initial implementation of the `wasi-keyvalue` proposal was added to
+  Wasmtime.
+  [#8983](https://github.com/bytecodealliance/wasmtime/pull/8983)
+  [#9032](https://github.com/bytecodealliance/wasmtime/pull/9032)
+  [#9050](https://github.com/bytecodealliance/wasmtime/pull/9050)
+  [#9062](https://github.com/bytecodealliance/wasmtime/pull/9062)
+
+* An `unsafe` API has been added to unload process trap handlers.
+  [#9022](https://github.com/bytecodealliance/wasmtime/pull/9022)
+
+* The s390x backend now fully supports tail calls.
+  [#9052](https://github.com/bytecodealliance/wasmtime/pull/9052)
+
 ### Changed
 
+* The `flags` type in the component model now has a hard limit of 32-or-fewer
+  flags. For more information about this transition see
+  https://github.com/WebAssembly/component-model/issues/370.
+  [#8882](https://github.com/bytecodealliance/wasmtime/pull/8882)
+
+* Multiple returns for functions in the component model are now gated by default
+  and are planned to be removed.
+  [#8965](https://github.com/bytecodealliance/wasmtime/pull/8965)
+
+* TCP streams in WASIp2 will now immediately return `StreamError::Closed` when
+  the TCP stream is closed or shut down.
+  [#8968](https://github.com/bytecodealliance/wasmtime/pull/8968)
+  [#9055](https://github.com/bytecodealliance/wasmtime/pull/9055)
+
+* Cranelift will now perform constant propagation on some floating-point
+  operations.
+  [#8954](https://github.com/bytecodealliance/wasmtime/pull/8954)
+
+* Wasmtime and Cranelift now require at least Rust 1.78.0 to compile.
+  [#9010](https://github.com/bytecodealliance/wasmtime/pull/9010)
+
+* The `wasmtime::Val` type now implements the `Copy` trait.
+  [#9024](https://github.com/bytecodealliance/wasmtime/pull/9024)
+
+* Wasmtime's wasi-nn implementation has been updated to track the upstream
+  specification.
+  [#9056](https://github.com/bytecodealliance/wasmtime/pull/9056)
+
+* Names provided to `trappable_imports` in `bindgen!` are now validated to be
+  used.
+  [#9057](https://github.com/bytecodealliance/wasmtime/pull/9057)
+
+* Support for multi-package `*.wit` files now requires a `package ...;` header
+  at the top of the file.
+  [#9053](https://github.com/bytecodealliance/wasmtime/pull/9053)
+
 --------------------------------------------------------------------------------
 
 Release notes for previous releases of Wasmtime can be found on the respective