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//! A "bare wasm" target representing a WebAssembly output that does not import
//! anything from its environment and also specifies an _upper_ bound on the set
//! of WebAssembly proposals that are supported.
//!
//! It's equivalent to the `wasm32-unknown-unknown` target with the additional
//! flags `-Ctarget-cpu=mvp` and `-Ctarget-feature=+mutable-globals`. This
//! enables just the features specified in <https://www.w3.org/TR/wasm-core-1/>
//!
//! This is a _separate target_ because using `wasm32-unknown-unknown` with
//! those target flags doesn't automatically rebuild libcore / liballoc with
//! them, and in order to get those libraries rebuilt you need to use the
//! nightly Rust feature `-Zbuild-std`. This target is for people who want to
//! use stable Rust, and target a stable set pf WebAssembly features.
use crate::spec::{Cc, LinkerFlavor, Target, TargetMetadata, base};
pub(crate) fn target() -> Target {
let mut options = base::wasm::options();
options.os = "none".into();
// WebAssembly 1.0 shipped in 2019 and included exactly one proposal
// after the initial "MVP" feature set: "mutable-globals".
options.cpu = "mvp".into();
options.features = "+mutable-globals".into();
options.add_pre_link_args(
LinkerFlavor::WasmLld(Cc::No),
&[
// For now this target just never has an entry symbol no matter the output
// type, so unconditionally pass this.
"--no-entry",
],
);
options.add_pre_link_args(
LinkerFlavor::WasmLld(Cc::Yes),
&[
// Make sure clang uses LLD as its linker and is configured appropriately
// otherwise
"--target=wasm32-unknown-unknown",
"-Wl,--no-entry",
],
);
Target {
llvm_target: "wasm32-unknown-unknown".into(),
metadata: TargetMetadata {
description: Some("WebAssembly".into()),
tier: Some(2),
host_tools: Some(false),
std: Some(false),
},
pointer_width: 32,
data_layout: "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-i128:128-n32:64-S128-ni:1:10:20".into(),
arch: "wasm32".into(),
options,
}
}
|
