[PATCH] D127777: [ThinLTO][ELF] Add --thinlto-emit-index-files option

[Jin Xin Ng via Phabricator via llvm-commits]

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Allows ThinLTO indices to be written to disk on-the-fly/as-part-of “normal” linker execution. Previously thinLTO indices could be written via --thinlto-index-only but that would cause the linker to exit early.

Note, this option does not currently work with:
--thinlto-object-suffix-replace, as this is intended to be used to consume minimized IR bitcode files while --thinlto-emit-index-files is intended to be run together with InProcessThinLTO (which cannot parse minimized IR).
--thinlto-prefix-replace and --thinlto-emit-imports-files support are left unimplemented but can be implemented if needed


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D127777

Files:
  lld/ELF/Config.h
  lld/ELF/Driver.cpp
  lld/ELF/LTO.cpp
  lld/ELF/Options.td
  lld/test/ELF/lto/thinlto-emit-index.ll
  llvm/include/llvm/LTO/LTO.h
  llvm/lib/LTO/LTO.cpp

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