Locate builtins using path from flag

This makes BzlLoadFunction resolve builtins bzls by reading the Root from --experimental_builtins_bzl_path, instead of doing package lookup on a hardcoded placeholder package path. Builtins bzls must now be loaded via the `@_builtins//:` syntax.

The special %install_base% and %workspace% path values are not yet supported.

Also:
- BzlLoadFunction now takes a BlazeDirectories
- @_builtins is a reserved RepositoryName
- Error messages in BzlLoadFunction now signal when the failure was in a builtin

Work toward #11437.

PiperOrigin-RevId: 339141292
15 files changed
tree: 90c10f5c6c01f97699fc6b98385cbee1749a4e73
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .bazelrc
  9. .gitattributes
  10. .gitignore
  11. AUTHORS
  12. BUILD
  13. CHANGELOG.md
  14. CODEBASE.md
  15. CODEOWNERS
  16. combine_distfiles.py
  17. combine_distfiles_to_tar.sh
  18. compile.sh
  19. CONTRIBUTING.md
  20. CONTRIBUTORS
  21. distdir.bzl
  22. ISSUE_TEMPLATE.md
  23. LICENSE
  24. README.md
  25. WORKSPACE
README.md

Bazel

{Fast, Correct} - Choose two

Build and test software of any size, quickly and reliably.

  • Speed up your builds and tests: Bazel rebuilds only what is necessary. With advanced local and distributed caching, optimized dependency analysis and parallel execution, you get fast and incremental builds.

  • One tool, multiple languages: Build and test Java, C++, Android, iOS, Go, and a wide variety of other language platforms. Bazel runs on Windows, macOS, and Linux.

  • Scalable: Bazel helps you scale your organization, codebase, and continuous integration solution. It handles codebases of any size, in multiple repositories or a huge monorepo.

  • Extensible to your needs: Easily add support for new languages and platforms with Bazel's familiar extension language. Share and re-use language rules written by the growing Bazel community.

Getting Started

Documentation

Contributing to Bazel

See CONTRIBUTING.md

Build status