[clang][Dependency Scanning] Cherry-picking Negative Stat Caching Diagnostics in Dependency Scanning Service #10681
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…ve Stat Cache Entries (llvm#135703) We have had numerous situations where the negatively stat cached paths are invalidated during the build, and such invalidations lead to build errors. This PR adds an API to diagnose such cases. `DependencyScanningFilesystemSharedCache::diagnoseNegativeStatCachedPaths` allows users of the cache to ask the cache to examine all negatively stat cached paths, and re-stat the paths using the passed-in file system. If any re-stat succeeds, the API emits diagnostics. rdar://149147920 (cherry picked from commit 9ef9167) Conflicts: clang/unittests/Tooling/DependencyScanning/DependencyScanningFilesystemTest.cpp
…lvm#10524) llvm#135703 added a C++ API to the shared cached to diagnose invalid negatively stat cached paths. This PR adds a C API so an external system can take advantage of the diagnostics. rdar://149147920 (cherry picked from commit b7aa45c)
llvm#138955) This PR makes a minor modification to make it more stable. The only change is adding a suffix to the path under test. rdar://149147920 (cherry picked from commit 2017831)
| @swift-ci please test |
jansvoboda11 approved these changes May 14, 2025
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This PR cherry-picks
llvm#135703
#10524
llvm#138955
These PRs implement clang's C-API to report invalid negatively stat cached paths.
rdar://149147920