[PATCH] D78983: [ELF] Add --print-archive-stats=

[Fangrui Song via Phabricator via llvm-commits]

MaskRay created this revision.
MaskRay added reviewers: grimar, psmith, ruiu.
Herald added subscribers: llvm-commits, arichardson, emaste.
Herald added a reviewer: espindola.
Herald added a project: LLVM.

gold has an option --print-symbol-counts= which prints:

  // For each archive
  archive $archive $members $fetched_members
  // For each object file
  symbols $object $defined_symbols $used_defined_symbols

In most cases, `$defined_symbols = $used_defined_symbols` unless weak
symbols are present. The `symbols` lines do not appear to be useful.

`archive` lines are useful: `$fetched_members=0` lines correspond to
unused archives. The information can be used to trim dependencies.

This patch implements --print-archive-stats= which prints the number of
members and the number of fetched members for each archive.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D78983

Files:
  lld/ELF/Config.h
  lld/ELF/Driver.cpp
  lld/ELF/Driver.h
  lld/ELF/InputFiles.cpp
  lld/ELF/InputFiles.h
  lld/ELF/MapFile.cpp
  lld/ELF/MapFile.h
  lld/ELF/Options.td
  lld/ELF/Writer.cpp
  lld/docs/ld.lld.1
  lld/test/ELF/print-archive-stats.s

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