[PATCH] D105922: [lld-macho] Add LTO cache support

[Leonard Grey via Phabricator via llvm-commits]

lgrey created this revision.
lgrey added a reviewer: lld-macho.
Herald added subscribers: ormris, dang, steven_wu, hiraditya, inglorion.
Herald added a reviewer: int3.
Herald added a reviewer: gkm.
Herald added a project: lld-macho.
lgrey requested review of this revision.

This adds support for the lld-only `--thinlto-cache-policy` option, as well as implementations for ld64's `-cache_path_lto`, `-prune_interval_lto`, `-prune_after_lto`, and `-max_relative_cache_size_lto`.

Because `llvm::CachePruningPolicy` has reasonable default values, it's infeasible to give `--thinlto-cache-policy` precedence over the individual ld64 cache pruning options without replicating the parsing code. Currently, we ignore the individual options when the composite option is provided, but we can also give the individual options precedence if that seems better.


https://reviews.llvm.org/D105922

Files:
  lld/MachO/Config.h
  lld/MachO/Driver.cpp
  lld/MachO/LTO.cpp
  lld/MachO/LTO.h
  lld/MachO/Options.td
  lld/test/MachO/Inputs/lto-cache.ll
  lld/test/MachO/lto-cache.ll

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