fix: install correct cc for wasm32-unknown-emscripten

Also fixed a typo in the sanity check for bootstrap, as we are checking for clang-likeness in every wasm target.

Author: JayAndJef

src/bootstrap/src/core/sanity.rs

@@ -312,7 +312,7 @@ than building it.
             .or_insert_with(|| Target::from_triple(&target.triple));
 
         // compiler-rt c fallbacks for wasm cannot be built with gcc
-        if target.contains("wasm") // bare metal targets without wasi sdk
+        if target.contains("wasm")
             && (build.config.optimized_compiler_builtins(*target)
                 || build.config.rust_std_features.contains("compiler-builtins-c"))
         {

src/ci/docker/host-x86_64/dist-various-1/Dockerfile

@@ -58,6 +58,12 @@ RUN ./install-riscv32-none-elf.sh
 COPY host-x86_64/dist-various-1/install-llvm-mingw.sh /build
 RUN ./install-llvm-mingw.sh
 
+COPY host-x86_64/dist-various-1/install-emscripten.sh /build
+RUN ./install-emscripten.sh
+
+# Add Emscripten to PATH
+ENV PATH="/build/emsdk:/build/emsdk/upstream/emscripten:/build/emsdk/node/current/bin:${PATH}"
+
 # Suppress some warnings in the openwrt toolchains we downloaded
 ENV STAGING_DIR=/tmp
 

src/ci/docker/host-x86_64/dist-various-1/install-emscripten.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+set -ex
+
+apt-get update
+apt-get install -y --no-install-recommends \
+  nodejs \
+  default-jre
+
+git clone https://github.com/emscripten-core/emsdk.git
+cd emsdk
+./emsdk install latest
+./emsdk activate latest