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532ac7d7 XL |
1 | //! A "bare wasm" target representing a WebAssembly output that makes zero |
2 | //! assumptions about its environment. | |
3 | //! | |
4 | //! The `wasm32-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). | |
9 | //! | |
10 | //! This target is more or less managed by the Rust and WebAssembly Working | |
11 | //! Group nowadays at https://github.com/rustwasm. | |
12 | ||
532ac7d7 | 13 | use super::wasm32_base; |
dfeec247 | 14 | use super::{LinkerFlavor, LldFlavor, Target}; |
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15 | |
16 | pub fn target() -> Result<Target, String> { | |
532ac7d7 XL |
17 | let mut options = wasm32_base::options(); |
18 | let clang_args = options.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap(); | |
abe05a73 | 19 | |
532ac7d7 XL |
20 | // Make sure clang uses LLD as its linker and is configured appropriately |
21 | // otherwise | |
22 | clang_args.push("--target=wasm32-unknown-unknown".to_string()); | |
2c00a5a8 | 23 | |
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24 | // For now this target just never has an entry symbol no matter the output |
25 | // type, so unconditionally pass this. | |
26 | clang_args.push("-Wl,--no-entry".to_string()); | |
dfeec247 XL |
27 | options |
28 | .pre_link_args | |
29 | .get_mut(&LinkerFlavor::Lld(LldFlavor::Wasm)) | |
532ac7d7 XL |
30 | .unwrap() |
31 | .push("--no-entry".to_string()); | |
0bf4aa26 | 32 | |
abe05a73 | 33 | Ok(Target { |
8faf50e0 | 34 | llvm_target: "wasm32-unknown-unknown".to_string(), |
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35 | target_endian: "little".to_string(), |
36 | target_pointer_width: "32".to_string(), | |
37 | target_c_int_width: "32".to_string(), | |
abe05a73 | 38 | target_os: "unknown".to_string(), |
b7449926 | 39 | target_env: String::new(), |
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40 | target_vendor: "unknown".to_string(), |
41 | data_layout: "e-m:e-p:32:32-i64:64-n32:64-S128".to_string(), | |
42 | arch: "wasm32".to_string(), | |
0531ce1d | 43 | linker_flavor: LinkerFlavor::Lld(LldFlavor::Wasm), |
532ac7d7 | 44 | options, |
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45 | }) |
46 | } |