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Build openmls native libraries for different platforms. Use when user asks about building, compiling, or creating native libraries for iOS, Android, macOS, Linux, or Windows.
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Release a new openmls_frb native crate version (stage 1 of the two-stage release). Use when the user wants to build/publish new native binaries after openmls dependency updates, bump the openmls_frb crate, or push a openmls_frb-* tag. NOT for the Dart pub.dev release (that is release-package).
Prepare a new version of openmls for publication to pub.dev. Use when user wants to release, publish, or tag a new version of the package.
Update openmls native library version. Use when checking for updates, upgrading openmls, bumping version, or updating native dependencies.
Review openmls Dart code for security issues. Use when reviewing code changes, checking for proper API usage, verifying secure patterns, or auditing cryptographic code.
Add a new database migration to EncryptedDb. Use when changing storage schema, data format, or serialization in the native library.
Flutter Rust Bridge patterns and best practices for this project. Use when writing Rust API code, adding new bindings, implementing MlsEngine methods, or troubleshooting FRB issues.
| name | build-native |
| description | Build openmls native libraries for different platforms. Use when user asks about building, compiling, or creating native libraries for iOS, Android, macOS, Linux, or Windows. |
Help with building the openmls_frb native library for all supported platforms.
ALWAYS use Makefile commands. Never call cargo/scripts directly.
# CORRECT
make build ARGS="--target aarch64-apple-darwin"
# WRONG - never do this
cd rust && cargo build --release
| Command | What it builds | Output |
|---|---|---|
make build | Current host platform (release) | rust/target/release/ |
make build ARGS="--target <rust-target>" | Specific Rust target | rust/target/<target>/release/ |
make build-android | All Android ABIs via cargo-ndk | rust/target/<target>/release/ |
make build-android ARGS="--target arm64-v8a" | One Android ABI | rust/target/<target>/release/ |
make build-web | WASM via wasm-pack | rust/target/wasm32/ |
The library artifact is libopenmls_frb.{dylib,so} / openmls_frb.dll
(web: openmls_frb.js + openmls_frb_bg.wasm).
There is no per-platform packaging step in this repo: consumers get precompiled
binaries from the GitHub Release openmls_frb-<version> via hook/build.dart
(see build-openmls.yml for the CI build matrix). To make a local build
visible to the hook, create a .skip_openmls_hook marker (see the header of
hook/build.dart).
Minimum OS versions are sourced from .copier-answers.yml and enforced with
make check-targets. CI sets them via IPHONEOS_DEPLOYMENT_TARGET,
MACOSX_DEPLOYMENT_TARGET and cargo-ndk --platform; make build-android
reads the Android minSdk via scripts/get_android_min_sdk.dart.
| Platform | Requirements |
|---|---|
| All | Rust toolchain (rustup, cargo), FVM |
| macOS / iOS | Xcode Command Line Tools (iOS: full Xcode) |
| Android | Android NDK + cargo-ndk (make setup-android) |
| Web | wasm-pack (make setup-web) |
| Windows | Visual Studio with C++ |
| Linux | gcc/g++, cross-compilation tools for arm64 |
| Platform | Rust Target |
|---|---|
| Linux x86_64 | x86_64-unknown-linux-gnu |
| Linux arm64 | aarch64-unknown-linux-gnu |
| macOS arm64 | aarch64-apple-darwin |
| macOS x86_64 | x86_64-apple-darwin |
| iOS device | aarch64-apple-ios |
| iOS simulator arm64 | aarch64-apple-ios-sim |
| iOS simulator x86_64 | x86_64-apple-ios |
| Android arm64 | aarch64-linux-android |
| Android arm | armv7-linux-androideabi |
| Android x86_64 | x86_64-linux-android |
| Windows | x86_64-pc-windows-msvc |
| Web | wasm32-unknown-unknown |
# Install Rust toolchain
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
# Check current NDK
echo $ANDROID_NDK_HOME
# Common paths
export ANDROID_NDK_HOME=~/Android/Sdk/ndk/26.3.11579264
export ANDROID_NDK_HOME=~/Library/Android/sdk/ndk/26.3.11579264
vcvars64.bat first# Full setup (installs all dependencies)
make setup
# Regenerate FRB bindings after Rust API changes
make codegen
# Show current crate version
make version