no-libc-wasm32.json

{
    "llvm-target": "wasm32-unknown-unknown",
    "arch": "wasm32",
    "os": "unknown",
    "env": "",
    "vendor": "",
    "linker-flavor": "ld.lld",
    "linker": "rust-lld",

    // We want to forbid linking the built-in Rust standard libraries:
    "no-default-libraries": true,
    // If we used threads, we'd need TLS, but we're going minimal:
    "has-thread-local": false,
    // We don't want the compiler to automatically embed a runtime start:
    "executables": false,

    // Make sure we do not attempt to call unwinding or fallback runtime code:
    "panic-strategy": "abort",
    "relocation-model": "static",

    // Let the compiler know it's basically a "bare" wasm environment
    "is-like-bare": true,
    "is-like-wasm": true,

    // If you ever need atomics or bulk-memory, specify them. By default, it's empty.
    "features": "",
    "max-atomic-width": 32,

    // These two lines help ensure we don't get default crate linkage:
    "no-compiler-rt": true,
    "disable-redzone": true
}