[all-commits] [llvm/llvm-project] 580910: Revert "[FileCheck] Add a diff output option for F...

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 580910073482c0b49be5364f9595ba2dc2bf8f2e
      https://github.com/llvm/llvm-project/commit/580910073482c0b49be5364f9595ba2dc2bf8f2e
  Author: Fangrui Song <i at maskray.me>
  Date:   2026-04-18 (Sat, 18 Apr 2026)

  Changed paths:
    M llvm/docs/CommandGuide/FileCheck.rst
    M llvm/include/llvm/FileCheck/FileCheck.h
    M llvm/lib/FileCheck/FileCheck.cpp
    M llvm/lib/FileCheck/FileCheckImpl.h
    R llvm/test/FileCheck/diff/diff-blank-stray.txt
    R llvm/test/FileCheck/diff/diff-empty-check.txt
    R llvm/test/FileCheck/diff/diff-label-boundary.txt
    R llvm/test/FileCheck/diff/diff-label-fuzzy-match.txt
    R llvm/test/FileCheck/diff/diff-label-next.txt
    R llvm/test/FileCheck/diff/diff-multi-block.txt
    R llvm/test/FileCheck/diff/diff-multi-failres.txt
    R llvm/test/FileCheck/diff/diff-multi-mismatch.txt
    R llvm/test/FileCheck/diff/diff-next-stray-line.txt
    R llvm/test/FileCheck/diff/diff-regex-escaping.txt
    R llvm/test/FileCheck/diff/diff-resync-after-noise.txt
    R llvm/test/FileCheck/diff/diff-resync-high-noise.txt
    R llvm/test/FileCheck/diff/diff-skipped-expected.txt
    R llvm/test/FileCheck/diff/diff-stress-large-input.txt
    M llvm/utils/FileCheck/FileCheck.cpp

  Log Message:
  -----------
  Revert "[FileCheck] Add a diff output option for FileCheck (#187120)" (#192803)

This reverts commit 40333cde2bbd62936d67478eab15ed1fa55b0532.

The implementation is buggy. There are thousands of failures in
```
FILECHECK_OPTS=--diff ninja -C /tmp/Rel check-llvm-mc
FILECHECK_OPTS=--diff ninja -C /tmp/Rel check-lld-elf
```



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