1 //! A "bare wasm" target representing a WebAssembly output that makes zero
2 //! assumptions about its environment.
4 //! The `wasm64-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).
11 use super::{LinkerFlavor, LldFlavor, Target};
13 pub fn target() -> Target {
14 let mut options = wasm_base::options();
15 options.os = "unknown".into();
16 options.linker_flavor = LinkerFlavor::Lld(LldFlavor::Wasm);
17 let clang_args = options.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap();
19 // Make sure clang uses LLD as its linker and is configured appropriately
21 clang_args.push("--target=wasm64-unknown-unknown".into());
23 // For now this target just never has an entry symbol no matter the output
24 // type, so unconditionally pass this.
25 clang_args.push("-Wl,--no-entry".into());
27 let lld_args = options.pre_link_args.get_mut(&LinkerFlavor::Lld(LldFlavor::Wasm)).unwrap();
28 lld_args.push("--no-entry".into());
29 lld_args.push("-mwasm64".into());
31 // Any engine that implements wasm64 will surely implement the rest of these
32 // features since they were all merged into the official spec by the time
33 // wasm64 was designed.
34 options.features = "+bulk-memory,+mutable-globals,+sign-ext,+nontrapping-fptoint".into();
37 llvm_target: "wasm64-unknown-unknown".into(),
39 data_layout: "e-m:e-p:64:64-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20".into(),
40 arch: "wasm64".into(),