[PATCH] D13801: [Support] Extend sys::path with user_cache_directory function.

[Paweł Bylica via llvm-commits]

chfast created this revision.
chfast added a subscriber: llvm-commits.

The new function sys::path::user_cache_directory tries to discover
a directory suitable for cache storage for current system user.

On Windows and Darwin it returns a path to system-specific user cache directory.

On Linux it follows XDG Base Directory Specification, what is:
- use non-empty $XDG_CACHE_HOME env var,
- use $HOME/.cache.

http://reviews.llvm.org/D13801

Files:
  include/llvm/Support/Path.h
  lib/Support/Unix/Path.inc
  lib/Support/Windows/Path.inc
  unittests/Support/Path.cpp

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