1 files changed, 50 insertions, 0 deletions
diff --git a/src/librustc_target/spec/wasm32_unknown_emscripten.rs b/src/librustc_target/spec/wasm32_unknown_emscripten.rs
new file mode 100644
index 00000000000..5077abf1e0e
--- /dev/null
+++ b/src/librustc_target/spec/wasm32_unknown_emscripten.rs
@@ -0,0 +1,50 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use super::{LinkArgs, LinkerFlavor, Target, TargetOptions};
+
+pub fn target() -> Result<Target, String> {
+    let mut post_link_args = LinkArgs::new();
+    post_link_args.insert(LinkerFlavor::Em,
+                          vec!["-s".to_string(),
+                               "BINARYEN=1".to_string(),
+                               "-s".to_string(),
+                               "ERROR_ON_UNDEFINED_SYMBOLS=1".to_string()]);
+
+    let opts = TargetOptions {
+        dynamic_linking: false,
+        executables: true,
+        // Today emcc emits two files - a .js file to bootstrap and
+        // possibly interpret the wasm, and a .wasm file
+        exe_suffix: ".js".to_string(),
+        linker_is_gnu: true,
+        allow_asm: false,
+        obj_is_bitcode: true,
+        is_like_emscripten: true,
+        max_atomic_width: Some(32),
+        post_link_args,
+        target_family: Some("unix".to_string()),
+        codegen_backend: "emscripten".to_string(),
+        .. Default::default()
+    };
+    Ok(Target {
+        llvm_target: "asmjs-unknown-emscripten".to_string(),
+        target_endian: "little".to_string(),
+        target_pointer_width: "32".to_string(),
+        target_c_int_width: "32".to_string(),
+        target_os: "emscripten".to_string(),
+        target_env: "".to_string(),
+        target_vendor: "unknown".to_string(),
+        data_layout: "e-p:32:32-i64:64-v128:32:128-n32-S128".to_string(),
+        arch: "wasm32".to_string(),
+        linker_flavor: LinkerFlavor::Em,
+        options: opts,
+    })
+}