Enable --experimental_remote_spawn_cache by default

- It is now an error to specify the gRPC remote execution backend in
  combination with a local disk or HTTP-based cache.
- It is now an error to specify both local disk and HTTP-based caches.

Note that before this CL, enabling the local disk cache silently disabled
remote execution - we now give an error in that case.

With these combination no longer being accepted, remote execution being enabled
now means that we only create a RemoteSpawnRunner, and don't provide a
SpawnCache. This is not a semantic change - we never created both.

In principle, it should be possible for users to combine local execution with
remote caching for actions that are marked local or no-remote, and still use
remote execution otherwise. However, Bazel cannot currently express this
combination of execution strategies.

RELNOTES: The --experimental_remote_spawn_cache flag is now enabled by default, and remote caching no longer needs --*_strategy=remote flags (it will fail if they are specified).
PiperOrigin-RevId: 198280398
6 files changed
tree: 6e18d59f4dc9e675653028b710b79a761b2c202d
  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. combine_distfiles.py
  14. combine_distfiles_to_tar.sh
  15. compile.sh
  16. CONTRIBUTING.md
  17. CONTRIBUTORS
  18. distdir.bzl
  19. ISSUE_TEMPLATE.md
  20. LICENSE
  21. README.md
  22. WORKSPACE
README.md

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