Fix Objc pre-execution header thinning

It was accidentally disabled by https://github.com/bazelbuild/bazel/commit/51a9596f592c183beffdeeffc43c86295c88a4a5 due to the refactoring in
CppCompileAction that made it no longer call the include processing if
shouldScanIncludes() returned false.

Note that ObjC header thinning relies on needsDotdInputPruning being
true as controlled by the --objc_use_dotd_pruning flag. Note that bazel
emits an error if header thinning is enabled, but dotd pruning is
disabled.

This was not caught by our existing tests because none of them actually
check if the list of inputs to the action was reduced before it is
executed. The tests only check that the include scanning action returns
a reduced list, but not that the reduced list is actually used in the
CppCompileAction.

PiperOrigin-RevId: 249835036
1 file changed
tree: 2326cb3dad5e300c37abdbb9433f0f34aa1e82f1
  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
README.md

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