add prebuilt simdutf artifacts to CI matrix

Instead of requiring V8_FROM_SOURCE for simdutf, add CI matrix entries
to build and publish prebuilt binaries with the simdutf feature enabled.
This mirrors the existing pattern used for v8_enable_pointer_compression.

Adds debug+release builds for: x86_64-apple-darwin, aarch64-apple-darwin,
x86_64-unknown-linux-gnu, aarch64-unknown-linux-gnu.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: bartlomieju

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ permissions: write-all
 
 jobs:
   build:
-    name: ${{ matrix.config.variant }} ${{ matrix.config.target }} ${{ matrix.config.v8_enable_pointer_compression && 'ptrcomp' || '' }}
+    name: ${{ matrix.config.variant }} ${{ matrix.config.target }} ${{ matrix.config.v8_enable_pointer_compression && 'ptrcomp' || '' }} ${{ matrix.config.simdutf && 'simdutf' || '' }}
     runs-on: ${{ matrix.config.os }}
     timeout-minutes: 180
     strategy:
@@ -117,13 +117,70 @@ jobs:
             v8_enable_pointer_compression: false
             cargo: cargo
 
+          # simdutf builds
+          - os: macos-15-large
+            target: x86_64-apple-darwin
+            variant: debug
+            v8_enable_pointer_compression: false
+            simdutf: true
+            cargo: cargo
+
+          - os: macos-15-large
+            target: x86_64-apple-darwin
+            variant: release
+            v8_enable_pointer_compression: false
+            simdutf: true
+            cargo: cargo
+
+          - os: macos-15
+            target: aarch64-apple-darwin
+            variant: debug
+            v8_enable_pointer_compression: false
+            simdutf: true
+            cargo: cargo
+
+          - os: macos-15
+            target: aarch64-apple-darwin
+            variant: release
+            v8_enable_pointer_compression: false
+            simdutf: true
+            cargo: cargo
+
+          - os: ${{ github.repository == 'denoland/rusty_v8' && 'ubuntu-22.04-xl' || 'ubuntu-22.04' }}
+            target: x86_64-unknown-linux-gnu
+            variant: debug
+            v8_enable_pointer_compression: false
+            simdutf: true
+            cargo: cargo
+
+          - os: ${{ github.repository == 'denoland/rusty_v8' && 'ubuntu-22.04-xl' || 'ubuntu-22.04' }}
+            target: x86_64-unknown-linux-gnu
+            variant: release
+            v8_enable_pointer_compression: false
+            simdutf: true
+            cargo: cargo
+
+          - os: ${{ github.repository == 'denoland/rusty_v8' && 'ubuntu-22.04-xl' || 'ubuntu-22.04' }}
+            target: aarch64-unknown-linux-gnu
+            variant: debug
+            v8_enable_pointer_compression: false
+            simdutf: true
+            cargo: cargo
+
+          - os: ${{ github.repository == 'denoland/rusty_v8' && 'ubuntu-22.04-xl' || 'ubuntu-22.04' }}
+            target: aarch64-unknown-linux-gnu
+            variant: release
+            v8_enable_pointer_compression: false
+            simdutf: true
+            cargo: cargo
+
     env:
       V8_FROM_SOURCE: true
       CARGO_VARIANT_FLAG: ${{ matrix.config.variant == 'release' && '--release' || '' }}
-      CARGO_FEATURE_FLAGS: ${{ matrix.config.v8_enable_pointer_compression && '--features v8_enable_pointer_compression' || '' }}
+      CARGO_FEATURE_FLAGS: ${{ format('{0} {1}', matrix.config.v8_enable_pointer_compression && '--features v8_enable_pointer_compression' || '', matrix.config.simdutf && '--features simdutf' || '') }}
       LIB_NAME: ${{ contains(matrix.config.target, 'windows') && 'rusty_v8' || 'librusty_v8' }}
       LIB_EXT: ${{ contains(matrix.config.target, 'windows') && 'lib' || 'a' }}
-      FEATURES_SUFFIX: ${{ matrix.config.v8_enable_pointer_compression && '_ptrcomp' || '' }}
+      FEATURES_SUFFIX: ${{ format('{0}{1}', matrix.config.v8_enable_pointer_compression && '_ptrcomp' || '', matrix.config.simdutf && '_simdutf' || '') }}
       RUSTFLAGS: -D warnings
 
     steps:
@@ -187,7 +244,7 @@ jobs:
             target/*/.*
             target/*/build
             target/*/deps
-          key: cargo1-${{ matrix.config.target }}-${{ matrix.config.variant }}-${{ matrix.config.v8_enable_pointer_compression }}-${{ hashFiles('Cargo.lock', 'build.rs', 'git_submodule_status.txt') }}
+          key: cargo1-${{ matrix.config.target }}-${{ matrix.config.variant }}-${{ matrix.config.v8_enable_pointer_compression }}-${{ matrix.config.simdutf }}-${{ hashFiles('Cargo.lock', 'build.rs', 'git_submodule_status.txt') }}
           restore-keys: cargo1-${{ matrix.config.target }}-${{ matrix.config.variant }}-${{ matrix.config.v8_enable_pointer_compression }}-
 
       - name: Install and start sccache

build.rs

@@ -99,15 +99,6 @@ fn main() {
   // because we store everything in a parent directory of OUT_DIR.
   let _lockfile = acquire_lock();
 
-  // The simdutf feature requires building from source because prebuilt
-  // artifacts are not produced with simdutf enabled.
-  if env::var("CARGO_FEATURE_SIMDUTF").is_ok() && !env_bool("V8_FROM_SOURCE") {
-    panic!(
-      "The `simdutf` cargo feature requires V8_FROM_SOURCE=1. \
-       Prebuilt binaries do not include simdutf."
-    );
-  }
-
   // Build from source
   if env_bool("V8_FROM_SOURCE") {
     if is_asan && env::var_os("OPT_LEVEL").unwrap_or_default() == "0" {
@@ -552,6 +543,9 @@ fn prebuilt_features_suffix() -> String {
   if env::var("CARGO_FEATURE_V8_ENABLE_SANDBOX").is_ok() {
     features.push_str("_sandbox");
   }
+  if env::var("CARGO_FEATURE_SIMDUTF").is_ok() {
+    features.push_str("_simdutf");
+  }
   features
 }