44 lines
1.7 KiB
Rust
44 lines
1.7 KiB
Rust
//! A "bare wasm" target representing a WebAssembly output that makes zero
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//! assumptions about its environment.
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//!
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//! The `wasm64-unknown-unknown` target is intended to encapsulate use cases
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//! that do not rely on any imported functionality. The binaries generated are
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//! entirely self-contained by default when using the standard library. Although
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//! the standard library is available, most of it returns an error immediately
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//! (e.g. trying to create a TCP stream or something like that).
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use super::wasm_base;
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use super::{LinkerFlavor, LldFlavor, Target};
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pub fn target() -> Target {
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let mut options = wasm_base::options();
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options.os = "unknown".into();
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options.linker_flavor = LinkerFlavor::Lld(LldFlavor::Wasm);
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options.add_pre_link_args(
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LinkerFlavor::Gcc,
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&[
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// Make sure clang uses LLD as its linker and is configured appropriately
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// otherwise
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"--target=wasm64-unknown-unknown",
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// For now this target just never has an entry symbol no matter the output
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// type, so unconditionally pass this.
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"-Wl,--no-entry",
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],
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);
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options.add_pre_link_args(LinkerFlavor::Lld(LldFlavor::Wasm), &["--no-entry", "-mwasm64"]);
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// Any engine that implements wasm64 will surely implement the rest of these
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// features since they were all merged into the official spec by the time
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// wasm64 was designed.
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options.features = "+bulk-memory,+mutable-globals,+sign-ext,+nontrapping-fptoint".into();
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Target {
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llvm_target: "wasm64-unknown-unknown".into(),
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pointer_width: 64,
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data_layout: "e-m:e-p:64:64-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20".into(),
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arch: "wasm64".into(),
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options,
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}
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}
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