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).
10 use super::{wasm_base, Cc, LinkerFlavor, Target};
12 pub fn target() -> Target {
13 let mut options = wasm_base::options();
14 options.os = "unknown".into();
16 options.add_pre_link_args(
17 LinkerFlavor::WasmLld(Cc::No),
19 // For now this target just never has an entry symbol no matter the output
20 // type, so unconditionally pass this.
25 options.add_pre_link_args(
26 LinkerFlavor::WasmLld(Cc::Yes),
28 // Make sure clang uses LLD as its linker and is configured appropriately
30 "--target=wasm64-unknown-unknown",
35 // Any engine that implements wasm64 will surely implement the rest of these
36 // features since they were all merged into the official spec by the time
37 // wasm64 was designed.
38 options.features = "+bulk-memory,+mutable-globals,+sign-ext,+nontrapping-fptoint".into();
41 llvm_target: "wasm64-unknown-unknown".into(),
43 data_layout: "e-m:e-p:64:64-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20".into(),
44 arch: "wasm64".into(),