50 lines
2.1 KiB
Rust
50 lines
2.1 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 `wasm32-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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//!
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//! This target is more or less managed by the Rust and WebAssembly Working
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//! Group nowadays at <https://github.com/rustwasm>.
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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".to_string();
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options.linker_flavor = LinkerFlavor::Lld(LldFlavor::Wasm);
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let clang_args = options.pre_link_args.entry(LinkerFlavor::Gcc).or_default();
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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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clang_args.push("--target=wasm32-unknown-unknown".to_string());
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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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clang_args.push("-Wl,--no-entry".to_string());
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// Rust really needs a way for users to specify exports and imports in
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// the source code. --export-dynamic isn't the right tool for this job,
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// however it does have the side effect of automatically exporting a lot
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// of symbols, which approximates what people want when compiling for
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// wasm32-unknown-unknown expect, so use it for now.
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clang_args.push("-Wl,--export-dynamic".to_string());
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// Add the flags to wasm-ld's args too.
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let lld_args = options.pre_link_args.entry(LinkerFlavor::Lld(LldFlavor::Wasm)).or_default();
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lld_args.push("--no-entry".to_string());
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lld_args.push("--export-dynamic".to_string());
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Target {
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llvm_target: "wasm32-unknown-unknown".to_string(),
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pointer_width: 32,
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data_layout: "e-m:e-p:32:32-i64:64-n32:64-S128".to_string(),
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arch: "wasm32".to_string(),
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options,
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}
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}
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