src/librustc_target/spec/wasm32_unknown_emscripten.rs

   1 use super::wasm32_base;
   2 use super::{LinkArgs, LinkerFlavor, Target, TargetOptions, PanicStrategy};
   3
   4 pub fn target() -> Result<Target, String> {
   5     let mut post_link_args = LinkArgs::new();
   6     post_link_args.insert(LinkerFlavor::Em,
   7                           vec!["-s".to_string(),
   8                                "ERROR_ON_UNDEFINED_SYMBOLS=1".to_string(),
   9                                "-s".to_string(),
  10                                "ASSERTIONS=1".to_string(),
  11                                "-s".to_string(),
  12                                "DISABLE_EXCEPTION_CATCHING=1".to_string(),
  13                                "-s".to_string(),
  14                                "ABORTING_MALLOC=0".to_string(),
  15                                // FIXME(tlively): Enable this linker option once libc type errors
  16                                // are resolved. See https://github.com/rust-lang/libc/pull/1478.
  17                                // "-Wl,--fatal-warnings".to_string(),
  18                                ]);
  19
  20     let opts = TargetOptions {
  21         // emcc emits two files - a .js file to instantiate the wasm and supply platform
  22         // functionality, and a .wasm file.
  23         exe_suffix: ".js".to_string(),
  24         linker: None,
  25         linker_is_gnu: true,
  26         is_like_emscripten: true,
  27         // FIXME(tlively): Emscripten supports unwinding, but we would have to pass
  28         // -enable-emscripten-cxx-exceptions to LLVM at codegen time and merge
  29         // https://reviews.llvm.org/rG5c3cdef84b82464756bb571c13c31cf7773860c3to use it.
  30         panic_strategy: PanicStrategy::Abort,
  31         post_link_args,
  32         target_family: Some("unix".to_string()),
  33         .. wasm32_base::options()
  34     };
  35     Ok(Target {
  36         llvm_target: "wasm32-unknown-emscripten".to_string(),
  37         target_endian: "little".to_string(),
  38         target_pointer_width: "32".to_string(),
  39         target_c_int_width: "32".to_string(),
  40         target_os: "emscripten".to_string(),
  41         target_env: String::new(),
  42         target_vendor: "unknown".to_string(),
  43         data_layout: "e-m:e-p:32:32-i64:64-n32:64-S128".to_string(),
  44         arch: "wasm32".to_string(),
  45         linker_flavor: LinkerFlavor::Em,
  46         options: opts,
  47     })
  48 }