musl

.github/workflows/ci.yml

@@ -62,6 +62,10 @@ jobs:
             variant: release
             cargo: cargo
 
+          - os: ${{ github.repository == 'denoland/rusty_v8' && 'ubuntu-24.04-xl' || 'ubuntu-24.04' }}
+            target: x86_64-unknown-linux-musl
+            variant: release
+
           - os: ${{ github.repository == 'denoland/rusty_v8' && 'windows-2022-xxl' || 'windows-2022' }}
             target: x86_64-pc-windows-msvc
             variant: release # Note: we do not support windows debug builds.
@@ -107,6 +111,10 @@ jobs:
         if: startsWith(matrix.config.os, 'ubuntu')
         run: |
           sudo apt-get install -y glib2.0
+          
+      - name: Install cross compilation toolchain (musl)
+        if: endsWith(matrix.config.target, '-musl')
+        run: rustup target add ${{ matrix.config.target }}
 
       - name: Install cross compilation toolchain
         if: matrix.config.target == 'aarch64-unknown-linux-gnu'

.gitmodules

@@ -37,3 +37,6 @@
 [submodule "third_party/fast_float/src"]
 	path = third_party/fast_float/src
 	url = https://chromium.googlesource.com/external/github.com/fastfloat/fast_float.git
+[submodule "musl-cross-make"]
+	path = musl-cross-make
+	url = https://github.com/richfelker/musl-cross-make.git

build.rs

@@ -190,9 +190,20 @@ fn build_v8(is_asan: bool) {
   } else {
     vec!["is_debug=false".to_string()]
   };
+
   if is_asan {
     gn_args.push("is_asan=true".to_string());
   }
+
+  if std::env::var("CARGO_CFG_TARGET_ENV").map_or(false, |e| e == "musl") {
+    build_musl_cross_make();
+
+    gn_args.push("use_custom_libcxx=true".to_string());
+    gn_args.push("is_clang=false".to_string());
+    gn_args.push("treat_warnings_as_errors=false".to_string());
+    gn_args.push("line_tables_only=false".to_string());
+  }
+
   if env::var("CARGO_FEATURE_USE_CUSTOM_LIBCXX").is_err() {
     gn_args.push("use_custom_libcxx=false".to_string());
   }
@@ -406,6 +417,30 @@ fn static_lib_name(suffix: &str) -> String {
   }
 }
 
+fn build_musl_cross_make() {
+  let toolchain_dir = build_dir().join("musl-cross-make");
+  if toolchain_dir.exists() {
+    println!("musl-cross-make toolchain already exists, skipping build");
+  }
+
+  std::fs::copy("config.mak", "musl-cross-make/config.mak").unwrap();
+  Command::new("make")
+    .arg("-C")
+    .arg("musl-cross-make")
+    .arg("TARGET=x86_64-linux-musl")
+    .status()
+    .unwrap();
+
+  Command::new("make")
+    .arg("-C")
+    .arg("musl-cross-make")
+    .arg("TARGET=x86_64-linux-musl")
+    .arg("install")
+    .arg(format!("OUTPUT={}", toolchain_dir.display()))
+    .status()
+    .unwrap();
+}
+
 fn static_lib_url() -> String {
   if let Ok(custom_archive) = env::var("RUSTY_V8_ARCHIVE") {
     return custom_archive;

config.mak

@@ -0,0 +1,7 @@
+MUSL_VER = 1.1.24
+GCC_VER  = 9.2.0
+
+GCC_CONFIG += --enable-default-pie
+
+DL_CMD   = curl -C - -L -s -o
+SHA1_CMD = shasum -a 1 -c

musl-cross-make

@@ -0,0 +1 @@
+Subproject commit 26bb55104559325b5e840911742220268f556d7a