Allow starlark transitions to read starlark-defined options.

Calculate and supply defaults for all read starlark options before transitions are applied. Future work includes:
- combining skyfunction calls for inputs and outputs of starlark transitions
- enforcing that BuildOptions.starlarkOptions will never hold default values (opposite of native options which always hold default values) in order to make BuildConfigurationWithDefault == BuildConfigurationWithNoValue
- Making sure BuildConfiguration properly reflects StarlarkOptions

Work towards #5574, #5577, #5578

RELNOTES: None.
PiperOrigin-RevId: 242681946
9 files changed
tree: c8822b78f22e923497dde3be22cce413cf431729
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. BUILD
  12. CHANGELOG.md
  13. CODEOWNERS
  14. combine_distfiles.py
  15. combine_distfiles_to_tar.sh
  16. compile.sh
  17. CONTRIBUTING.md
  18. CONTRIBUTORS
  19. distdir.bzl
  20. ISSUE_TEMPLATE.md
  21. LICENSE
  22. README.md
  23. WORKSPACE
README.md

Bazel

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