# `wasm-component-ld`

This crate contains a binary named `wasm-component-ld` which is a wrapper around
two pieces of functionality used to produce a [WebAssembly Component]

1. The `wasm-ld` linker driver provided by LLVM
2. The [`wit_component::ComponentEncoder`] type

This binary will first invoke `wasm-ld` and then run the componentization
process to produce a final component.

[WebAssembly Component]: https://component-model.bytecodealliance.org/
[`wit_component::ComponentEncoder`]: https://docs.rs/wit-component/latest/wit_component/struct.ComponentEncoder.html

## Installation

This repository provides [precompiled
binaries](https://github.com/bytecodealliance/wasm-component-ld/releases) of
`wasm-component-ld`. This repository can also be installed with [`cargo binstall`].

Installations of [wasi-sdk] have this binary packaged by default in the sysroot
and the Rust `wasm32-wasip2` target, upon reaching tier 2, will also come
packaged with this binary included.

This means that while a version can be installed manually it should not be
required to do so.

[`cargo binstall`]: https://github.com/cargo-bins/cargo-binstall
[wasi-sdk]: https://github.com/WebAssembly/wasi-sdk

## Options

The `wasm-component-ld` binary is suitable to use as a linker driver during
compilations. For Clang and Rust the `wasm32-wasip2` target will automatically
invoke this binary as the linker.

This means that `wasm-component-ld` forwards most of its arguments to `wasm-ld`.
Additionally all flags of `wasm-ld` are supported and forwarded to `wasm-ld`.
For example you can invoke the linker like `wasm-component-ld --max-memory=N
...`.

The `wasm-component-ld` binary has a few custom arguments for itself as well
which are not forwarded to `wasm-ld` and can be explored with `-h` or `--help`.

# License

This project is triple licenced under the Apache 2/ Apache 2 with LLVM exceptions/ MIT licences. The reasoning for this is:
- Apache 2/ MIT is common in the rust ecosystem.
- Apache 2/ MIT is used in the rust standard library, and some of this code may be migrated there.
- Some of this code may be used in compiler output, and the Apache 2 with LLVM exceptions licence is useful for this.

For more details see
- [Apache 2 Licence](LICENSE-APACHE)
- [Apache 2 Licence with LLVM exceptions](LICENSE-Apache-2.0_WITH_LLVM-exception)
- [MIT Licence](LICENSE-MIT)

### Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in this project by you, as defined in the Apache 2/ Apache 2 with LLVM exceptions/ MIT licenses,
shall be licensed as above, without any additional terms or conditions.