Forcibly use the bundled version of `@platforms` for loading the host platform repo rule

https://github.com/bazelbuild/bazel/issues/21877 happened because, even though we define `@platforms` to be the bundled version shipped with Bazel (which is 0.0.9 on HEAD), people tend to define their own versions of `@platforms` in WORKSPACE. If this ends up being a lower version (very likely), the subsequent `load` to use the `host_platform_repo` repo rule (which is a Starlark version of `local_config_platform`) will fail because that repo rule was only introduced in `platforms` version 0.0.9.

To resolve this conundrum, we define a new repo `@internal_platforms_do_not_use` that _also_ points to the bundled version of `@platforms`. Nobody is likely to define this repo, so we can fairly reliably get the Starlark repo rule, and also still allow people to override the actual `@platforms` targets they use.

This only affects WORKSPACE users; if `--enable_bzlmod` is set, the `@host_platform` seen by `@bazel_tools` will come from the module extension instead.

Work towards https://github.com/bazelbuild/bazel/issues/18285.

Fixes https://github.com/bazelbuild/bazel/issues/21877.

Closes #21902.

PiperOrigin-RevId: 622238362
Change-Id: I6335ab1bc26ba9ef54473d8a21fc5a8510a3ace5
2 files changed
tree: 6699a1e18166ce1e484cea426e2db0a64b869acf
  1. .bazelci/
  2. .github/
  3. examples/
  4. scripts/
  5. site/
  6. src/
  7. third_party/
  8. tools/
  9. .bazelrc
  10. .bazelversion
  11. .gitattributes
  12. .gitignore
  13. AUTHORS
  14. bazel_downloader.cfg
  15. BUILD
  16. CHANGELOG.md
  17. CODE_OF_CONDUCT.md
  18. CODEOWNERS
  19. combine_distfiles.py
  20. combine_distfiles_to_tar.sh
  21. compile.sh
  22. CONTRIBUTING.md
  23. CONTRIBUTORS
  24. distdir.bzl
  25. extensions.bzl
  26. LICENSE
  27. maven_install.json
  28. MODULE.bazel
  29. MODULE.bazel.lock
  30. rbe_extension.bzl
  31. README.md
  32. repositories.bzl
  33. requirements.txt
  34. SECURITY.md
  35. WORKSPACE
  36. WORKSPACE.bzlmod
  37. workspace_deps.bzl
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