build-native

Build Native Libraries

Builds libconnect_norito_bridge.so for Android from the Rust crate at crates/connect_norito_bridge in the iroha repository. The Kotlin SDK lives next to the java/ directory in the same repo, so the Rust source is at ../../crates/connect_norito_bridge relative to this project.

Prerequisites

• Rust toolchain (1.92+) with Android targets: aarch64-linux-android, x86_64-linux-android
• cargo-ndk installed: cargo install cargo-ndk
• ANDROID_NDK_HOME environment variable set (NDK 28+)

Build with Gradle task

./gradlew :offline-wallet-android:buildNativeLibs

The task reads iroha.dir from local.properties and runs cargo ndk. Output goes to offline-wallet-android/src/main/jniLibs/.

Manual build

1. Validate environment

which cargo-ndk || cargo install cargo-ndk
echo $ANDROID_NDK_HOME
rustup target list --installed | grep android

If targets are missing:

rustup target add aarch64-linux-android x86_64-linux-android

2. Build

From the iroha repository root:

cargo ndk -t arm64-v8a -t x86_64 \
  -o <kotlin-sdk-dir>/offline-wallet-android/src/main/jniLibs \
  build --release -p connect_norito_bridge

Target ABIs:

• arm64-v8a — production devices (required)
• x86_64 — emulators (required for development)
• armeabi-v7a — skip (upstream rkyv crate incompatible with 32-bit)

3. Verify

ls -lh offline-wallet-android/src/main/jniLibs/arm64-v8a/libconnect_norito_bridge.so  # ~14MB
ls -lh offline-wallet-android/src/main/jniLibs/x86_64/libconnect_norito_bridge.so      # ~18MB

Known issues

• armeabi-v7a fails — rkyv crate has a const evaluation overflow on 32-bit targets. This is upstream; skip this ABI.
• Long build time — First build compiles all Rust dependencies (~5-10 min). Incremental builds are faster.
• Rust version — Project requires rustc 1.92+. Check with rustc --version.