Platform Builds - Cross-Platform Considerations

Your Packages Are Platform-Agnostic ✅

All your mojo-* packages contain pure Mojo source code with no platform-specific dependencies. They will build and run on: - ✅ Linux (x86_64, ARM64) - ✅ macOS (Intel, Apple Silicon) - ✅ Windows (via WSL - Mojo’s current Windows support)

Local Validation vs CI Builds

What You’re Running Locally

When you run ./scripts/validate-recipe.sh, it performs: - Schema validation - Checks recipe.yaml structure - Dependency resolution - Verifies channels and requirements - Render-only mode - Doesn’t actually compile/build

Platform: Runs on your Mac (ARM64)
Scope: Validates recipe correctness, not platform compatibility

What modular-community CI Runs

The modular-community workflow (.github/workflows/build-pr.yml) builds on: - ubuntu-latest (Linux x86_64) - macos-latest (macOS ARM64) - magic_arm64_8core (Custom ARM64 runner)

Platform: All three
Scope: Full compilation and testing on each platform

Why Your Packages Are Cross-Platform

1. Pure Mojo Source

Your packages ship source code, not binaries:

build:
  script:
    - mkdir -p $PREFIX/lib/mojo/toml
    - cp -r src/toml/* $PREFIX/lib/mojo/toml/  # Just copying .mojo files

No compilation happens during installation - just file copying.

2. No Platform-Specific Code

None of your packages use: - ❌ C/C++ extensions - ❌ Platform-specific syscalls - ❌ Architecture-dependent libraries - ❌ Binary dependencies

They’re pure Mojo parsing/formatting libraries.

3. Mojo Compiler Handles Platforms

The mojo-compiler dependency is platform-aware:

requirements:
  run:
    - ${{ pin_compatible('mojo-compiler') }}

When users install your package, conda fetches the appropriate mojo-compiler for their platform automatically.

noarch Packages

Some of your packages (like mojo-dotenv) are marked as noarch:

build:
  noarch: generic

Meaning: - Built once, works everywhere - No recompilation needed per platform - Faster installation - Smaller storage footprint

When to use noarch: - ✅ Pure source files only (no compilation) - ✅ No platform-specific paths/tools - ✅ No test executables

Your packages that could use noarch: - mojo-toml ✅ (pure source) - mojo-yaml ✅ (pure source) - mojo-asciichart ✅ (pure source) - mojo-dotenv ✅ (already marked noarch) - mojo-ini ⚠️ (builds .mojopkg, platform-specific)

Adding noarch to Your Recipes

To make packages truly platform-independent, add to your recipes:

build:
  number: 0
  noarch: generic  # <-- Add this
  script:
    - mkdir -p $PREFIX/lib/mojo/package
    - cp -r src/package/* $PREFIX/lib/mojo/package/

Benefits: - Single build works everywhere - Faster package creation - Less storage on conda servers

Trade-off: - Can’t do platform-specific logic in build scripts - Can’t compile binaries - (Not an issue for your pure-source packages)

Testing Locally on Other Platforms

Test on Linux (via Docker)

docker run -it --rm -v $(pwd):/workspace condaforge/miniforge3:latest bash
cd /workspace
./scripts/validate-recipe.sh packaging/recipe.yaml

Test on Linux (via GitHub Actions)

The .github/workflows/validate-recipe.yml runs on ubuntu-latest, so pushing to GitHub tests Linux automatically.

Windows Testing

Mojo on Windows requires WSL2. For now, rely on: 1. Local macOS validation (schema/syntax) 2. CI Linux builds (prove cross-platform works) 3. User testing on Windows once published

Recommendation

For your next recipe updates, consider adding noarch: generic to: - ✅ mojo-toml - ✅ mojo-yaml
- ✅ mojo-asciichart

Keep mojo-ini without noarch since it builds a .mojopkg file.

This will make builds faster and more efficient while maintaining full cross-platform compatibility.

Summary

Aspect	Status	Notes
Your code	✅ Platform-agnostic	Pure Mojo source
Local validation	✅ Works on your Mac	Schema + dependency checks
CI builds	✅ Multi-platform	Linux, macOS, ARM64
User installs	✅ Any platform	Mojo compiler handles it
Recommendation	Add noarch: generic	Faster, more efficient

Your packages will work on any platform that supports Mojo! 🎉