new target

Author: devsnek

compiler/rustc_target/src/abi/call/mod.rs

@@ -605,12 +605,7 @@ impl<'a, Ty> FnAbi<'a, Ty> {
             "nvptx64" => nvptx64::compute_abi_info(self),
             "hexagon" => hexagon::compute_abi_info(self),
             "riscv32" | "riscv64" => riscv::compute_abi_info(cx, self),
-            "wasm32"
-                if cx.target_spec().os != "emscripten"
-                    && std::env::var("RUSTC_USE_WASM32_BINDGEN_COMPAT_ABI")
-                        .map(|x| &x != "0")
-                        .unwrap_or(false) =>
-            {
+            "wasm32" if cx.target_spec().os == "bindgen" => {
                 wasm32_bindgen_compat::compute_abi_info(self)
             }
             "wasm32" | "asmjs" => wasm32::compute_abi_info(cx, self),

compiler/rustc_target/src/spec/mod.rs

@@ -613,6 +613,7 @@ supported_targets! {
     ("thumbv7a-uwp-windows-msvc", thumbv7a_uwp_windows_msvc),
 
     ("asmjs-unknown-emscripten", asmjs_unknown_emscripten),
+    ("wasm32-unknown-bindgen", wasm32_unknown_bindgen),
     ("wasm32-unknown-emscripten", wasm32_unknown_emscripten),
     ("wasm32-unknown-unknown", wasm32_unknown_unknown),
     ("wasm32-wasi", wasm32_wasi),

compiler/rustc_target/src/spec/wasm32_unknown_bindgen.rs

@@ -0,0 +1,9 @@
+//! This target is a variant of `wasm32-unknown-unknown` which uses the bindgen
+//! ABI instead of the normal ABI.
+use super::{wasm32_unknown_unknown, Target};
+
+pub fn target() -> Target {
+    let mut target = wasm32_unknown_unknown::target();
+    target.options.os = "bindgen".to_string();
+    target
+}

src/doc/rustc/src/platform-support.md

@@ -126,6 +126,7 @@ target | std | host | notes
 `thumbv8m.base-none-eabi` | * |  | ARMv8-M Baseline
 `thumbv8m.main-none-eabi` | * |  | ARMv8-M Mainline
 `thumbv8m.main-none-eabihf` | * |  | ARMv8-M Mainline, hardfloat
+`wasm32-unknown-bindgen` | ✓ |  | WebAssembly via wasm-bindgen
 `wasm32-unknown-emscripten` | ✓ |  | WebAssembly via Emscripten
 `wasm32-unknown-unknown` | ✓ |  | WebAssembly
 `wasm32-wasi` | ✓ |  | WebAssembly with WASI