Support select() on constraint_value for aliases.

This implements approach #4 of
https://github.com/bazelbuild/bazel/issues/13047#issuecomment-805309450.

The basic change adds a new toolchain resolution mode: "resolve iff the target has a select()". It then sets alias() to that mode.

We could remove this special casing if we ever ubiquitously provide platform info to *all* rules (https://github.com/bazelbuild/bazel/issues/12899#issuecomment-767759147).

RELNOTES: alias() can now select() directly on constraint_value()

Fixes https://github.com/bazelbuild/bazel/issues/13047.

Closes #14310.

PiperOrigin-RevId: 411868223
8 files changed
tree: 928a46f5901c7ab21fce95425b60cd9184cb74bb
  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. CODE_OF_CONDUCT.md
  15. CODEBASE.md
  16. CODEOWNERS
  17. combine_distfiles.py
  18. combine_distfiles_to_tar.sh
  19. compile.sh
  20. CONTRIBUTING.md
  21. CONTRIBUTORS
  22. distdir.bzl
  23. distdir_deps.bzl
  24. ISSUE_TEMPLATE.md
  25. LICENSE
  26. MODULE.bazel
  27. README.md
  28. SECURITY.md
  29. WORKSPACE
  30. WORKSPACE.bzlmod
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