[PATCH] D47266: Update thin-lto cache file atimes when on windows

[Owen Reynolds via Phabricator via llvm-commits]

gbreynoo created this revision.
gbreynoo added reviewers: pcc, Bigcheese, twoh.
Herald added subscribers: llvm-commits, eraman, inglorion, mehdi_amini.

Thin-lto cache file atimes are used for expiration based pruning, and since Vista, access file times are not updated by Windows by default:
https://blogs.technet.microsoft.com/filecab/2006/11/07/disabling-last-access-time-in-windows-vista-to-improve-ntfs-performance/

This means on Windows, cache files are currently being pruned from creation time. This change manually updates cache files that are accessed by Thin-lto, when on Windows.


Repository:
  rL LLVM

https://reviews.llvm.org/D47266

Files:
  include/llvm/Support/FileSystem.h
  include/llvm/Support/MemoryBuffer.h
  lib/LTO/Caching.cpp
  lib/LTO/ThinLTOCodeGenerator.cpp
  lib/Support/MemoryBuffer.cpp
  lib/Support/Unix/Path.inc
  lib/Support/Windows/Path.inc
  test/ThinLTO/X86/cache.ll
  unittests/Support/Path.cpp

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