Add platform mapping function.

Introduces a new SkyFunction which reads a platform mapping file, parses its contents and produces a platform mapping sky value which can then be used to apply the mapping to configurations (in the form of BuildConfigurationValue.Key).

The file's location is obtained from the newly introduced flag --platform_mappings and defaults to //:platform_mappings.

Note that this logic is not in use anywhere yet because the key mapping has not been applied. This will follow in a future CL.

Step 4/N towards the platforms mapping functionality for https://github.com/bazelbuild/bazel/issues/6426

RELNOTES: None.
PiperOrigin-RevId: 239043475
8 files changed
tree: a109f5998d9943b5ae4c6e89dbf0cbc449e2fc80
  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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