[PATCH] D31096: LTO, Support: Add a safeguard against pruning a directory that is not a cache directory.

[Peter Collingbourne via Phabricator via llvm-commits]

pcc created this revision.

Use the presence of the llvmcache.timestamp file to mark a directory as a
cache directory. Only prune the cache if the file exists. The idea is to
protect against data loss if the user supplies an incorrect cache directory.


https://reviews.llvm.org/D31096

Files:
  lld/test/ELF/lto/cache.ll
  llvm/include/llvm/Support/CachePruning.h
  llvm/lib/LTO/Caching.cpp
  llvm/lib/LTO/ThinLTOCodeGenerator.cpp
  llvm/lib/Support/CachePruning.cpp
  llvm/lib/Support/Path.cpp
  llvm/test/ThinLTO/X86/cache-config.ll
  llvm/test/ThinLTO/X86/cache-import-lists.ll
  llvm/test/ThinLTO/X86/cache-typeid-resolutions.ll
  llvm/test/ThinLTO/X86/cache.ll
  llvm/test/ThinLTO/X86/empty_module_with_cache.ll
  llvm/test/tools/gold/X86/cache.ll

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