Support wasm32-unknown-emscripten

.github/actions/auto_gen_bind_pr/action.yml

@@ -11,6 +11,9 @@ runs:
       shell: bash
       run: echo "branch=${GITHUB_REF#refs/heads/}" >> $GITHUB_OUTPUT
       id: extract_branch
+    - name: Install emscripten
+      if: inputs.triple == 'wasm32-unknown-emscripten'
+      uses: mymindstorm/setup-emsdk@v12
     - name: Install cross compiler for linux aarch64
       if: inputs.triple == 'aarch64-unknown-linux-gnu'
       shell: bash

.github/workflows/gen_bind.yml

@@ -27,6 +27,8 @@ jobs:
             triple: aarch64-linux-android
           - os: ubuntu-latest
             triple: x86_64-linux-android
+          - os: ubuntu-latest
+            triple: wasm32-unknown-emscripten
           - os: macos-latest
             triple: x86_64-apple-darwin
           - os: macos-latest

.github/workflows/test.yml

@@ -57,6 +57,8 @@ jobs:
             target: aarch64-linux-android
           - os: ubuntu-latest
             target: x86_64-linux-android
+          - os: ubuntu-latest
+            target: wasm32-unknown-emscripten
           - os: macos-latest
             target: aarch64-apple-darwin
           - os: macos-latest
@@ -71,6 +73,9 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       # FIXME: auto_gen_bind_prにも処理があるので共通化する
+      - name: Install emscripten
+        if: matrix.target == 'wasm32-unknown-emscripten'
+        uses: mymindstorm/setup-emsdk@v12
       - name: Install cross compiler for linux aarch64
         if: matrix.target == 'aarch64-unknown-linux-gnu'
         shell: bash

crates/open_jtalk-sys/build.rs

@@ -1,9 +1,11 @@
 use std::{
-    env,
+    env, fs,
+    io::BufRead,
     path::{Path, PathBuf},
-    process::Command,
+    process::{Command, Stdio},
     str,
 };
+
 fn main() {
     let mut cmake_conf = cmake::Config::new("open_jtalk");
     let target = env::var("TARGET").unwrap();
@@ -60,6 +62,10 @@ fn main() {
         }
     }
 
+    if target.contains("emscripten") {
+        include_dirs.extend(search_emscripten_include_directories());
+    }
+
     let dst_dir = cmake_conf.build();
     let lib_dir = dst_dir.join("lib");
     println!("cargo:rustc-link-search={}", lib_dir.to_str().unwrap());
@@ -85,6 +91,7 @@ fn generate_bindings(
         .into_iter()
         .map(|dir| format!("-I{}", dir.as_ref().to_str().unwrap()))
         .chain([format!("-I{}", include_dir.to_str().unwrap())])
+        .chain(["-fvisibility=default".to_string()])
         .collect::<Vec<_>>();
     println!("cargo:rerun-if-changed=wrapper.hpp");
     println!("cargo:rerun-if-changed=src/generated/bindings.rs");
@@ -118,3 +125,33 @@ fn generate_bindings(
         .write_to_file(&generated_file)
         .expect("Couldn't write bindings!");
 }
+
+fn search_emscripten_include_directories() -> impl IntoIterator<Item = PathBuf> {
+    let empty_cpp_path = Path::new(&env::var_os("OUT_DIR").unwrap()).join("empty.cpp");
+    fs::write(&empty_cpp_path, b"").unwrap();
+
+    let mut command;
+    if cfg!(target_os = "windows") {
+        command = Command::new("cmd");
+        command.arg("/C");
+    } else {
+        command = Command::new("sh");
+        command.arg("-c");
+    };
+
+    let empp_output = command
+        .arg(format!("em++ --verbose {}", empty_cpp_path.display()))
+        .stderr(Stdio::piped())
+        .output()
+        .unwrap();
+
+    empp_output
+        .stderr
+        .lines()
+        .map(Result::unwrap)
+        .skip_while(|line| line.trim() != "#include <...> search starts here:")
+        .skip(1)
+        .take_while(|line| line.trim() != "End of search list.")
+        .map(|line| PathBuf::from(line.trim()))
+        .collect::<Vec<_>>()
+}

crates/open_jtalk-sys/src/generated/bindings.rs

@@ -57,3 +57,9 @@ include!(concat!(
     env!("CARGO_MANIFEST_DIR"),
     "/src/generated/android/aarch64/bindings.rs"
 ));
+
+#[cfg(all(target_os = "emscripten", target_arch = "wasm32"))]
+include!(concat!(
+    env!("CARGO_MANIFEST_DIR"),
+    "/src/generated/emscripten/wasm32/bindings.rs"
+));