[PATCH] D41776: [lit] Implement "-r" option for builtin "diff" command + a test using that.

[Max Moroz via Phabricator via llvm-commits]

Dor1s updated this revision to Diff 128805.
Dor1s marked 3 inline comments as done.
Dor1s added a comment.

Use None for empty directories instead of a fake string.


https://reviews.llvm.org/D41776

Files:
  test/tools/llvm-cov/multithreaded-report.test
  utils/lit/lit/TestRunner.py
  utils/lit/tests/Inputs/shtest-shell/diff-r.txt
  utils/lit/tests/shtest-shell.py

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