Remove old support for emscripten/wasm32-u-u

This commit removes the `wasm32-shim.js` file, for example, and deletes
old support for Emscripten which hasn't been exercised in some time.

Author: alexcrichton

src/bootstrap/src/core/build_steps/test.rs

@@ -1657,8 +1657,8 @@ NOTE: if you're sure you want to do this, please open an issue as to why. In the
         // ensure that `libproc_macro` is available on the host.
         builder.ensure(compile::Std::new(compiler, compiler.host));
 
-        // As well as the target, except for plain wasm32, which can't build it
-        if suite != "mir-opt" && !target.contains("wasm") && !target.contains("emscripten") {
+        // As well as the target
+        if suite != "mir-opt" {
             builder.ensure(TestHelpers { target });
         }
 
@@ -2511,16 +2511,7 @@ fn prepare_cargo_test(
     dylib_path.insert(0, PathBuf::from(&*builder.sysroot_libdir(compiler, target)));
     cargo.env(dylib_path_var(), env::join_paths(&dylib_path).unwrap());
 
-    if target.contains("emscripten") {
-        cargo.env(
-            format!("CARGO_TARGET_{}_RUNNER", envify(&target.triple)),
-            builder.config.nodejs.as_ref().expect("nodejs not configured"),
-        );
-    } else if target.starts_with("wasm32") {
-        let node = builder.config.nodejs.as_ref().expect("nodejs not configured");
-        let runner = format!("{} {}/src/etc/wasm32-shim.js", node.display(), builder.src.display());
-        cargo.env(format!("CARGO_TARGET_{}_RUNNER", envify(&target.triple)), &runner);
-    } else if builder.remote_tested(target) {
+    if builder.remote_tested(target) {
         cargo.env(
             format!("CARGO_TARGET_{}_RUNNER", envify(&target.triple)),
             format!("{} run 0", builder.tool_exe(Tool::RemoteTestClient).display()),

src/etc/wasm32-shim.js

@@ -2632,9 +2632,7 @@ impl<'test> TestCx<'test> {
         // double the length.
         let mut f = self.output_base_dir().join("a");
         // FIXME: This is using the host architecture exe suffix, not target!
-        if self.config.target.contains("emscripten") {
-            f = f.with_extra_extension("js");
-        } else if self.config.target.contains("wasm32") {
+        if self.config.target.starts_with("wasm") {
             f = f.with_extra_extension("wasm");
         } else if self.config.target.contains("spirv") {
             f = f.with_extra_extension("spv");
@@ -2649,32 +2647,6 @@ impl<'test> TestCx<'test> {
         // then split apart its command
         let mut args = self.split_maybe_args(&self.config.runner);
 
-        // If this is emscripten, then run tests under nodejs
-        if self.config.target.contains("emscripten") {
-            if let Some(ref p) = self.config.nodejs {
-                args.push(p.into());
-            } else {
-                self.fatal("emscripten target requested and no NodeJS binary found (--nodejs)");
-            }
-        // If this is otherwise wasm, then run tests under nodejs with our
-        // shim
-        } else if self.config.target.contains("wasm32") {
-            if let Some(ref p) = self.config.nodejs {
-                args.push(p.into());
-            } else {
-                self.fatal("wasm32 target requested and no NodeJS binary found (--nodejs)");
-            }
-
-            let src = self
-                .config
-                .src_base
-                .parent()
-                .unwrap() // chop off `ui`
-                .parent()
-                .unwrap(); // chop off `tests`
-            args.push(src.join("src/etc/wasm32-shim.js").into_os_string());
-        }
-
         let exe_file = self.make_exe_name();
 
         args.push(exe_file.into_os_string());