Introduce --incompatible_use_python_toolchains

This renames --experimental_use_python_toolchains to --incompatible. It also adds the behavior to the flag that

  1) py_runtime's python_version attribute becomes manadatory, and

  2) the --python_top flag is disallowed (it is superseded by toolchains), as well as --python2_path and --python3_path (they were already no-ops). --python_path is strongly discouraged but not yet banned due to an existing use on Windows (#7901).

Feature issue is #7375, incompatible change migration issue is #7899.

RELNOTES[INC]: Introduced --incompatible_use_python_toolchains, which supersedes --python_top/--python_path. See #7899 and #7375 for more information.

PiperOrigin-RevId: 241134532
9 files changed
tree: 997d0b05988c48f15815ee75f3733c98c4b55534
  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
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