wasi2

1. First, download the appropriate tarball below
2. Extract it, it'll make a directory called wasi
3. Execute rustup toolchain link wasi $PWD/wasi
4. Execute rustc +wasi -vV and make sure it works
5. Create hello.rs which is the standard rust hello world
6. rustc +wasi hello.rs --target wasm32-unknown-wasi
7. Clone https://github.com/cranestation/wasmtime-wasi
8. cargo run --bin wasmtime /path/to/hello.wasm

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If you want to interoperate with C code, then finish step 4 above and follow afterwards with:

5. Clone https://github.com/cranestation/wasmception-wasi
6. Run make inside there

• This'll take quite awhile as it builds clang

7. rustc +wasi hello.rs --target wasm32-unknown-wasi -C target-feature=-crt-static -C linker=/path/to/wasmception-wasi/dist/bin/clang