[all-commits] [llvm/llvm-project] 602900: [clang][scan-deps] Add option to disable caching s...

[Jan Svoboda via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 60290059386b267e52c2e0dbb37867ce546f3788
      https://github.com/llvm/llvm-project/commit/60290059386b267e52c2e0dbb37867ce546f3788
  Author: Jan Svoboda <jan_svoboda at apple.com>
  Date:   2026-05-29 (Fri, 29 May 2026)

  Changed paths:
    M clang/include/clang/DependencyScanning/DependencyScanningFilesystem.h
    M clang/include/clang/DependencyScanning/DependencyScanningService.h
    M clang/lib/DependencyScanning/DependencyScannerImpl.cpp
    M clang/lib/DependencyScanning/DependencyScanningFilesystem.cpp
    M clang/lib/DependencyScanning/DependencyScanningService.cpp
    M clang/lib/DependencyScanning/DependencyScanningWorker.cpp
    M clang/tools/clang-scan-deps/ClangScanDeps.cpp
    M clang/tools/clang-scan-deps/Opts.td
    M clang/unittests/DependencyScanning/DependencyScanningFilesystemTest.cpp

  Log Message:
  -----------
  [clang][scan-deps] Add option to disable caching stat failures (#200484)

While the source code isn't supposed to change during a build, in some
environments it does. This adds an option that disables caching of stat
failures, meaning that source files can be added to the build during
scanning.

This adds a `-no-cache-negative-stats` option to clang-scan-deps to
enable this behavior. There are no tests for clang-scan-deps as there's
no reliable way to do so from it. A unit test has been added that
modifies the filesystem between scans to test it.

Co-authored-by: Michael Spencer <bigcheesegs at gmail.com>



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