[all-commits] [llvm/llvm-project] 55323c: [clang][deps] Only bypass scanning VFS for the mod...

[Jan Svoboda via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 55323ca6c8b9d21d85591f3499b299b62463321f
      https://github.com/llvm/llvm-project/commit/55323ca6c8b9d21d85591f3499b299b62463321f
  Author: Jan Svoboda <jan_svoboda at apple.com>
  Date:   2024-08-13 (Tue, 13 Aug 2024)

  Changed paths:
    M clang/include/clang/Tooling/DependencyScanning/DependencyScanningFilesystem.h
    M clang/lib/Tooling/DependencyScanning/DependencyScanningFilesystem.cpp
    M clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
    M clang/unittests/Tooling/DependencyScanning/DependencyScanningFilesystemTest.cpp

  Log Message:
  -----------
  [clang][deps] Only bypass scanning VFS for the module cache (#88800)

The scanning VFS doesn't cache stat failures of paths with no extension.
This was originally implemented to avoid caching the non-existence of
the modules cache directory that the modular scanner will eventually
create if it does not exist.

However, this prevents caching of the non-existence of all directories
and notably also header files from the standard C++ library, which can
lead to sub-par performance.

This patch adds an API to the scanning VFS that allows clients to
configure path prefix for which to bypass the scanning VFS and use the
underlying VFS directly.



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