Android build fails for armeabi-v7a linking voltra_js_renderer: undefined JSI/Hermes symbols on RN 0.86 / Expo 57

[zhenyu-hong]

Description

npx expo run:android --device fails while building @use-voltra/android-client@2.1.1 in an Expo / React Native app.

The failing task is :use-voltra_android-client:buildCMakeDebug[armeabi-v7a]. The linker cannot resolve JSI/Hermes symbols while linking libvoltra_js_renderer.so.

This looks ABI-related: the generated CMake/Ninja files link libjsi.so and libhermesvm.so for arm64-v8a, but the generated armeabi-v7a link command only links fbjni and omits both JSI and Hermes libraries.

Environment

• @use-voltra/android-client: 2.1.1
• expo: 57.0.2
• react-native: 0.86.0
• @sentry/react-native: 8.16.0
• New Architecture: newArchEnabled=true
• Hermes: hermesEnabled=true
• Android compileSdk / targetSdk: 36
• Android minSdk: 24
• Gradle: 9.3.1
• Java: 17.0.19
• Host OS: macOS 26.5.1, aarch64
• CMake: 3.22.1
• NDK seen in linker invocation: 27.0.12077973

Android config:

reactNativeArchitectures=armeabi-v7a,arm64-v8a,x86,x86_64
newArchEnabled=true
hermesEnabled=true

The Expo/Gradle command printed at the end includes -PreactNativeArchitectures=arm64-v8a, but Voltra still attempts to build :use-voltra_android-client:buildCMakeDebug[armeabi-v7a].

Reproduction

1. Use an Expo 57 / React Native 0.86 app with Hermes and the New Architecture enabled.
2. Install/configure @use-voltra/android-client@2.1.1.
3. Run:

npx expo run:android --device

Expected behavior

The Android debug build should succeed for the target ABI, or Voltra should avoid building ABIs where the required React Native / Hermes prefab libraries are unavailable.

Actual behavior

The build fails while linking libvoltra_js_renderer.so for armeabi-v7a:

> Task :use-voltra_android-client:buildCMakeDebug[armeabi-v7a] FAILED
C/C++: ld.lld: error: undefined symbol: facebook::jsi::Value::~Value()
C/C++: >>> referenced by voltra_js_renderer.cpp:89
C/C++: >>> referenced by voltra_js_renderer.cpp:114
C/C++: ld.lld: error: undefined symbol: facebook::jsi::Value::asObject(facebook::jsi::IRuntime&) const &
C/C++: >>> referenced by voltra_js_renderer.cpp:98
C/C++: ld.lld: error: undefined symbol: typeinfo for facebook::jsi::JSError
C/C++: ld.lld: error: undefined symbol: facebook::hermes::makeHermesRuntime(hermes::vm::RuntimeConfig const&)
C/C++: >>> referenced by voltra_js_renderer.cpp:50
C/C++: ld.lld: error: undefined symbol: facebook::jsi::Object::asFunction(facebook::jsi::IRuntime&) &&
C/C++: >>> referenced by voltra_js_renderer.cpp:162
C/C++: ld.lld: error: undefined symbol: facebook::jsi::Value::asString(facebook::jsi::IRuntime&) const &
C/C++: >>> referenced by voltra_js_renderer.cpp:174
C/C++: clang++: error: linker command failed with exit code 1

Additional local evidence

@use-voltra/android-client/android/CMakeLists.txt links these targets:

target_link_libraries(voltra_js_renderer
  android
  log
  ReactAndroid::jsi
  hermes-engine::hermesvm
  fbjni::fbjni
)

For arm64-v8a, the generated build.ninja contains:

LINK_LIBRARIES = -landroid -llog .../libjsi.so .../libhermesvm.so .../libfbjni.so -latomic -lm

For armeabi-v7a, the generated build.ninja contains only:

LINK_LIBRARIES = -landroid -llog .../libfbjni.so -latomic -lm

That matches the unresolved JSI/Hermes symbols.

I searched existing issues for voltra_js_renderer, facebook::jsi, armeabi-v7a, and hermesvm, but did not find an existing report for this build failure.