rustc_target/spec/targets/
wasm32_unknown_emscripten.rs

1use crate::spec::{
2    LinkArgs, LinkerFlavor, PanicStrategy, RelocModel, Target, TargetOptions, base, cvs,
3};
4
5pub(crate) fn target() -> Target {
6    // Reset flags for non-Em flavors back to empty to satisfy sanity checking tests.
7    let pre_link_args = LinkArgs::new();
8    let post_link_args =
9        TargetOptions::link_args(LinkerFlavor::EmCc, &["-sABORTING_MALLOC=0", "-sWASM_BIGINT"]);
10
11    let opts = TargetOptions {
12        os: "emscripten".into(),
13        linker_flavor: LinkerFlavor::EmCc,
14        // emcc emits two files - a .js file to instantiate the wasm and supply platform
15        // functionality, and a .wasm file.
16        exe_suffix: ".js".into(),
17        linker: None,
18        pre_link_args,
19        post_link_args,
20        relocation_model: RelocModel::Pic,
21        panic_strategy: PanicStrategy::Unwind,
22        no_default_libraries: false,
23        families: cvs!["unix", "wasm"],
24        ..base::wasm::options()
25    };
26    Target {
27        llvm_target: "wasm32-unknown-emscripten".into(),
28        metadata: crate::spec::TargetMetadata {
29            description: Some("WebAssembly via Emscripten".into()),
30            tier: Some(2),
31            host_tools: Some(false),
32            std: Some(true),
33        },
34        pointer_width: 32,
35        data_layout: "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-i128:128-f128:64-n32:64-S128-ni:1:10:20"
36            .into(),
37        arch: "wasm32".into(),
38        options: opts,
39    }
40}