Support constraint_value directly in select()

No more need for a redundant config_setting. See #8583 for an example.

This was a bit subtle. constraint_value can't directly export a ConfigMatchingProvider because it needs to know the
platform to determine if it's a match. But platforms are built out of constraint_values, so the platform isn't available
yet. So the parent target with the select() provides this detail.

Also beautifies "invalid select() key" errors in support of https://github.com/bazelbuild/bazel/issues/11984.

Fixes https://github.com/bazelbuild/bazel/issues/8583.

RELNOTES[NEW]: select() directly supports constraint_value (no need for an intermediate config_setting).

Closes #12071.

PiperOrigin-RevId: 331181346
10 files changed
tree: 61eb1f6d6d71d53d62fb76df81ba69cb9e31a13d
  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
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