#![no_std] with WASI is more complicated than I thought it would be

1. cargo-wasi

   1 2 446 3.3 Rust

   A lightweight Cargo subcommand to build Rust code for the `wasm32-wasi` target

   

   I use cargo-wasi to build it:

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3. wasi-libc

   2 57 895 8.1 C

   WASI libc implementation for WebAssembly

   

   So what happened is that _start is already defined by this mysterious crt1-command.o. I didn't learn until much after that this is from wasi-libc:

4. WASI

   3 52 5,066 7.2 Rust

   WebAssembly System Interface

   

   Uh... ok then. At this point I decide that I should probably use WASI to define this exit function, instead of just endlessly looping. So I link in proc_exit. According to the WASI docs, proc_exit takes in an exitcode (a u32) and returns nothing. Perfect!

5. wasi-rs

   4 1 289 6.4 Rust

   Experimental WASI API bindings for Rust

   

   At this point, I look into Bytecode Alliance's WASI rust bindings, used by Rust's std.

6. wasmtime

   5 186 16,007 9.9 Rust

   A lightweight WebAssembly runtime that is fast, secure, and standards-compliant

   

   I use fd_write, and since I don't want to look into how interface types work, I just look at the wasi crate again, with some help from the wasmtime WASI WAT tutorial.

7. wee_alloc

   6 7 680 0.0 Rust

   The Wasm-Enabled, Elfin Allocator

   

   Ok. Now I need to add in a global allocator. I use wee_alloc since I know it works pretty well with WASM: Cargo.toml

8. compiler-builtins

   7 12 396 9.3 Rust

   Porting `compiler-rt` intrinsics to Rust

   

   Um. Ok, I remember this kind of thing. I do some searching and then rediscover compiler_builtins.

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