1 files changed, 34 insertions, 0 deletions
diff --git a/compiler/rustc_target/src/spec/wasm32_unknown_emscripten.rs b/compiler/rustc_target/src/spec/wasm32_unknown_emscripten.rs
new file mode 100644
index 000000000..c7e7d2210
--- /dev/null
+++ b/compiler/rustc_target/src/spec/wasm32_unknown_emscripten.rs
@@ -0,0 +1,34 @@
+use super::{cvs, wasm_base};
+use super::{LinkArgs, LinkerFlavor, PanicStrategy, RelocModel, Target, TargetOptions};
+
+pub fn target() -> Target {
+    // Reset flags for non-Em flavors back to empty to satisfy sanity checking tests.
+    let pre_link_args = LinkArgs::new();
+    let post_link_args = TargetOptions::link_args(
+        LinkerFlavor::Em,
+        &["-sABORTING_MALLOC=0", "-Wl,--fatal-warnings"],
+    );
+
+    let opts = TargetOptions {
+        os: "emscripten".into(),
+        linker_flavor: LinkerFlavor::Em,
+        // emcc emits two files - a .js file to instantiate the wasm and supply platform
+        // functionality, and a .wasm file.
+        exe_suffix: ".js".into(),
+        linker: None,
+        pre_link_args,
+        post_link_args,
+        relocation_model: RelocModel::Pic,
+        panic_strategy: PanicStrategy::Unwind,
+        no_default_libraries: false,
+        families: cvs!["unix", "wasm"],
+        ..wasm_base::options()
+    };
+    Target {
+        llvm_target: "wasm32-unknown-emscripten".into(),
+        pointer_width: 32,
+        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(),
+        arch: "wasm32".into(),
+        options: opts,
+    }
+}