rustc_target/spec/targets/
wasm32_unknown_emscripten.rs

1use crate::spec::{
2    LinkArgs, LinkerFlavor, PanicStrategy, RelocModel, Target, TargetMetadata, TargetOptions, base,
3    cvs,
4};
5
6pub(crate) fn target() -> Target {
7    // Reset flags for non-Em flavors back to empty to satisfy sanity checking tests.
8    let pre_link_args = LinkArgs::new();
9    let post_link_args =
10        TargetOptions::link_args(LinkerFlavor::EmCc, &["-sABORTING_MALLOC=0", "-sWASM_BIGINT"]);
11
12    let opts = TargetOptions {
13        os: "emscripten".into(),
14        linker_flavor: LinkerFlavor::EmCc,
15        // emcc emits two files - a .js file to instantiate the wasm and supply platform
16        // functionality, and a .wasm file.
17        exe_suffix: ".js".into(),
18        linker: None,
19        pre_link_args,
20        post_link_args,
21        relocation_model: RelocModel::Pic,
22        panic_strategy: PanicStrategy::Unwind,
23        no_default_libraries: false,
24        families: cvs!["unix", "wasm"],
25        ..base::wasm::options()
26    };
27    Target {
28        llvm_target: "wasm32-unknown-emscripten".into(),
29        metadata: TargetMetadata {
30            description: Some("WebAssembly via Emscripten".into()),
31            tier: Some(2),
32            host_tools: Some(false),
33            std: Some(true),
34        },
35        pointer_width: 32,
36        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"
37            .into(),
38        arch: "wasm32".into(),
39        options: opts,
40    }
41}