1 //! A "bare wasm" target representing a WebAssembly output that makes zero
2 //! assumptions about its environment.
4 //! The `wasm32-unknown-unknown` target is intended to encapsulate use cases
5 //! that do not rely on any imported functionality. The binaries generated are
6 //! entirely self-contained by default when using the standard library. Although
7 //! the standard library is available, most of it returns an error immediately
8 //! (e.g. trying to create a TCP stream or something like that).
10 //! This target is more or less managed by the Rust and WebAssembly Working
11 //! Group nowadays at <https://github.com/rustwasm>.
13 use super::wasm32_base;
14 use super::{LinkerFlavor, LldFlavor, Target};
16 pub fn target() -> Target {
17 let mut options = wasm32_base::options();
18 options.os = "unknown".to_string();
19 options.linker_flavor = LinkerFlavor::Lld(LldFlavor::Wasm);
20 let clang_args = options.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap();
22 // Make sure clang uses LLD as its linker and is configured appropriately
24 clang_args.push("--target=wasm32-unknown-unknown".to_string());
26 // For now this target just never has an entry symbol no matter the output
27 // type, so unconditionally pass this.
28 clang_args.push("-Wl,--no-entry".to_string());
31 .get_mut(&LinkerFlavor::Lld(LldFlavor::Wasm))
33 .push("--no-entry".to_string());
36 llvm_target: "wasm32-unknown-unknown".to_string(),
38 data_layout: "e-m:e-p:32:32-i64:64-n32:64-S128".to_string(),
39 arch: "wasm32".to_string(),