v0.1.1-rc1

Release Notes: rules_scala_native v0.1.1-rc1

This release candidate focuses on improving cross-compilation reliability, enhancing Windows support, and introducing internal testing for the Starlark rules.

What's New

Improved Windows Support

Significant progress has been made in stabilizing the Windows toolchain.

• Archiver Fix: Resolved the "ar not found" error during the Scala Native linking phase on Windows.
• Path Construction: Improved logic for constructing the linker PATH, ensuring standard system paths (like System32) are included when necessary.

🛠️ Refined Cross-Compilation Logic

• Target Triple Logic: Extrated and decoupled target triple derivation for better maintainability and testability.
• Platform Flags: Improved derivation of platform-specific linker flags for POSIX and Windows systems.

🧪 Internal Quality Assurance

• Starlark Unit Tests: Added a comprehensive suite of unit tests for rule internals, including target_triple helpers and ScalaNativeInfo provider verification.

📚 Documentation & Examples

• External C Dependencies: Added a new example project demonstrating how to link against external C libraries (like WiringPi) while cross-compiling for Raspberry Pi.

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Installation

Update your MODULE.bazel file to use the new version:

# MODULE.bazel (partial)
bazel_dep(name = "rules_scala_native", version = "0.1.1-rc1")

# Required dependencies remain the same
bazel_dep(name = "rules_scala", version = "7.2.2")
bazel_dep(name = "llvm", version = "0.6.1")

# Register toolchains
register_toolchains(
    "@llvm//toolchain:all",
    "@rules_scala_toolchains//...:all",
    "@rules_scala_native//scala_native:scala_native_toolchain",
)

Contributors

Full Changelog:

• v0.1.0...v0.1.1-rc1

v0.1.0

Release Notes: rules_scala_native v0.1.0

We are excited to announce the first release candidate for rules_scala_native, bringing scalable, hermetic Scala Native builds to the Bazel ecosystem.

Key Features

📦 Bzlmod First

Full support for Bazel's modern dependency management system (Bzlmod). No WORKSPACE configuration required.

🌐 Advanced Cross-Compilation

Seamlessly target multiple architectures and operating systems using a hermetic LLVM/Clang toolchain.

• Verified Host: Linux x86_64
• Verified Targets: 72 combinations including Linux (glibc 2.28+, musl), macOS, and Windows.
• Supported Architectures: x86_64, aarch64.

🔌 Polyglot Interoperability

Easy integration with other native languages via Bazel dependencies. Link scala_native_binary against:

• cc_library (C/C++)
• rust_static_library (via rules_rust)
• zig_static_library (via rules_zig)

🧪 First-Class Testing

Native support for JUnit tests via scala_native_test, ensuring your native code is as reliable as your JVM code.

Installation

Add the following to your MODULE.bazel file:

# MODULE.bazel (partial)
bazel_dep(name = "rules_scala_native", version = "0.1.0")

# Required dependencies
bazel_dep(name = "rules_scala", version = "7.2.2")
bazel_dep(name = "llvm", version = "0.6.1")

# Register toolchains
register_toolchains(
    "@llvm//toolchain:all",
    "@rules_scala_toolchains//...:all",
    "@rules_scala_native//scala_native:scala_native_toolchain",
)

Requirements

• Bazel: 9.0.0 or higher
• Scala: 3.8.1
• Scala Native: 0.5.10

Current Limitations

• Windows support is currently in early stage (work-in-progress).
• scala_native_test requires explicit listing of test suites.
• Only Scala 3.8.1 and Scala Native 0.5.10 are officially supported in this release.

Contributors

A huge thanks to everyone on the Scala who contributed to this release!

Full Changelog: https://github.com/Programming-Rivers/rules_scala_native/commits/v0.1.0