compiler/rustc_target/src/spec/wasm32_unknown_emscripten.rs

   1 use super::{cvs, wasm_base};
   2 use super::{LinkArgs, LinkerFlavor, PanicStrategy, Target, TargetOptions};
   3
   4 pub fn target() -> Target {
   5     let mut options = wasm_base::options();
   6
   7     let clang_args = options.pre_link_args.entry(LinkerFlavor::Gcc).or_default();
   8
   9     // Rust really needs a way for users to specify exports and imports in
  10     // the source code. --export-dynamic isn't the right tool for this job,
  11     // however it does have the side effect of automatically exporting a lot
  12     // of symbols, which approximates what people want when compiling for
  13     // wasm32-unknown-unknown expect, so use it for now.
  14     clang_args.push("--export-dynamic".into());
  15
  16     let mut post_link_args = LinkArgs::new();
  17     post_link_args.insert(
  18         LinkerFlavor::Em,
  19         vec!["-sABORTING_MALLOC=0".into(), "-Wl,--fatal-warnings".into()],
  20     );
  21
  22     let opts = TargetOptions {
  23         os: "emscripten".into(),
  24         linker_flavor: LinkerFlavor::Em,
  25         // emcc emits two files - a .js file to instantiate the wasm and supply platform
  26         // functionality, and a .wasm file.
  27         exe_suffix: ".js".into(),
  28         linker: None,
  29         panic_strategy: PanicStrategy::Unwind,
  30         no_default_libraries: false,
  31         post_link_args,
  32         families: cvs!["unix", "wasm"],
  33         ..options
  34     };
  35     Target {
  36         llvm_target: "wasm32-unknown-emscripten".into(),
  37         pointer_width: 32,
  38         data_layout: "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-f128:64-n32:64-S128-ni:1:10:20".into(),
  39         arch: "wasm32".into(),
  40         options: opts,
  41     }
  42 }