Add optional tool_path_origin to Tools in C++ crosstool

This change adds an optional field to the C++ crosstool proto that
allows configuring the origin tool_path is relative to.

For now, the origin can be one of the following:
  - CROSSTOOL_PACKAGE: If tool_path is a relative path, it's assumed to
    be relative to the package of the crosstool top.
  - FILESYSTEM_ROOT: tool_path is an absolute path. This is checked by
    Bazel.
  - WORKSPACE_ROOT: tool_path must be a relative path and is assumed to
    be relative to the exec-root of the workspace (similar to other
    executables).

Updates bazelbuild/bazel#8438

Closes #10967.

PiperOrigin-RevId: 310142352
5 files changed
tree: 214ff25f04368e615c0a75b56e3df6246707051a
  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. CODEOWNERS
  15. combine_distfiles.py
  16. combine_distfiles_to_tar.sh
  17. compile.sh
  18. CONTRIBUTING.md
  19. CONTRIBUTORS
  20. distdir.bzl
  21. ISSUE_TEMPLATE.md
  22. LICENSE
  23. README.md
  24. WORKSPACE
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