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Bazel Platforms Examples

This repo requires Bazel 0.28 or later (or built from HEAD).

This repo contains a collection of examples demonstrating how to use various Bazel concepts related to platforms, toolchains, configurations, and configurable attributes.

It also tries to give guidance when each of these concepts is used and should accompany documentation on bazel.build. Be sure to use --toolchain_resolution_debug where the resolution isn't obvious.

Structure

├── .bazelrc      # Setting defaults until https://github.com/bazelbuild/bazel/issues/7081 is fixed.
│
├── WORKSPACE     # Here we define @platforms repo with constraints. We use common
│                 # constraints repository from
│                 # https://github.com/bazelbuild/platforms. We also register
│                 # toolchains and we register execution platforms there.
│
├── BUILD         # Here we define all needed 'platform' targets that we then use
│                 # in examples.
│
├── examples      # Actual examples, one per subpackage.
│
└── yolo          # Yolo-lang rules definition.
    │
    ├── BUILD     # Here we define all 'toolchain' targets that we then use in
    │             # in examples.
    │
    └── defs.bzl

Yolo-lang here is obviously not a real programming language, it's just a simple implementation of Bazel Starlark rules that is meant to demonstrate examples without confusing us with technical details.