1 files changed, 46 insertions, 0 deletions
diff --git a/compiler/rustc_target/src/spec/wasm32_unknown_unknown.rs b/compiler/rustc_target/src/spec/wasm32_unknown_unknown.rs
new file mode 100644
index 00000000000..ded95a34d55
--- /dev/null
+++ b/compiler/rustc_target/src/spec/wasm32_unknown_unknown.rs
@@ -0,0 +1,46 @@
+//! A "bare wasm" target representing a WebAssembly output that makes zero
+//! assumptions about its environment.
+//!
+//! The `wasm32-unknown-unknown` target is intended to encapsulate use cases
+//! that do not rely on any imported functionality. The binaries generated are
+//! entirely self-contained by default when using the standard library. Although
+//! the standard library is available, most of it returns an error immediately
+//! (e.g. trying to create a TCP stream or something like that).
+//!
+//! This target is more or less managed by the Rust and WebAssembly Working
+//! Group nowadays at https://github.com/rustwasm.
+
+use super::wasm32_base;
+use super::{LinkerFlavor, LldFlavor, Target};
+
+pub fn target() -> Result<Target, String> {
+    let mut options = wasm32_base::options();
+    let clang_args = options.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap();
+
+    // Make sure clang uses LLD as its linker and is configured appropriately
+    // otherwise
+    clang_args.push("--target=wasm32-unknown-unknown".to_string());
+
+    // For now this target just never has an entry symbol no matter the output
+    // type, so unconditionally pass this.
+    clang_args.push("-Wl,--no-entry".to_string());
+    options
+        .pre_link_args
+        .get_mut(&LinkerFlavor::Lld(LldFlavor::Wasm))
+        .unwrap()
+        .push("--no-entry".to_string());
+
+    Ok(Target {
+        llvm_target: "wasm32-unknown-unknown".to_string(),
+        target_endian: "little".to_string(),
+        target_pointer_width: "32".to_string(),
+        target_c_int_width: "32".to_string(),
+        target_os: "unknown".to_string(),
+        target_env: String::new(),
+        target_vendor: "unknown".to_string(),
+        data_layout: "e-m:e-p:32:32-i64:64-n32:64-S128".to_string(),
+        arch: "wasm32".to_string(),
+        linker_flavor: LinkerFlavor::Lld(LldFlavor::Wasm),
+        options,
+    })
+}