| //! A "bare wasm" target representing a WebAssembly output that makes zero |
| //! assumptions about its environment. |
| //! |
| //! The `wasm64-unknown-unknown` target is intended to encapsulate use cases |
| //! that do not rely on any imported functionality. The binaries generated are |
| //! entirely self-contained by default when using the standard library. Although |
| //! the standard library is available, most of it returns an error immediately |
| //! (e.g. trying to create a TCP stream or something like that). |
| |
| use crate::spec::{base, Cc, LinkerFlavor, Target}; |
| |
| pub fn target() -> Target { |
| let mut options = base::wasm::options(); |
| options.os = "unknown".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", |
| "-mwasm64", |
| ], |
| ); |
| options.add_pre_link_args( |
| LinkerFlavor::WasmLld(Cc::Yes), |
| &[ |
| // Make sure clang uses LLD as its linker and is configured appropriately |
| // otherwise |
| "--target=wasm64-unknown-unknown", |
| "-Wl,--no-entry", |
| ], |
| ); |
| |
| // Any engine that implements wasm64 will surely implement the rest of these |
| // features since they were all merged into the official spec by the time |
| // wasm64 was designed. |
| options.features = "+bulk-memory,+mutable-globals,+sign-ext,+nontrapping-fptoint".into(); |
| |
| Target { |
| llvm_target: "wasm64-unknown-unknown".into(), |
| metadata: crate::spec::TargetMetadata { |
| description: None, |
| tier: None, |
| host_tools: None, |
| std: None, |
| }, |
| pointer_width: 64, |
| data_layout: "e-m:e-p:64:64-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20".into(), |
| arch: "wasm64".into(), |
| options, |
| } |
| } |