[PATCH] D141970: [Clang][LLD] Add --lto-CGO[0-3] option

[Scott Linder via Phabricator via llvm-commits]

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Allow controlling the CodeGenOpt::Level independent of the LTO
optimization level in LLD via new options for the COFF, ELF, MachO, and
wasm frontends to lld. Most are spelled as --lto-CGO[0-3], but COFF is
spelled as -opt:lldltocgo=[0-3].

Also change the behavior in the default case (i.e. when the CG opt level
is not specified explicitly), mapping each LTO opt level to its
numerically-equivalent CG opt level.

The existing behavior was decided in https://reviews.llvm.org/D57422 and
maps the LTO opt levels to CG opt levels such that it is impossible to
achieve CG opt levels 0 or 1 when using LTO. I think a direct mapping is
less surprising.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D141970

Files:
  lld/COFF/Config.h
  lld/COFF/Driver.cpp
  lld/COFF/LTO.cpp
  lld/Common/Args.cpp
  lld/ELF/Config.h
  lld/ELF/Driver.cpp
  lld/ELF/LTO.cpp
  lld/ELF/Options.td
  lld/MachO/Arch/ARM.cpp
  lld/MachO/Config.h
  lld/MachO/Driver.cpp
  lld/MachO/EhFrame.cpp
  lld/MachO/ICF.cpp
  lld/MachO/InputSection.cpp
  lld/MachO/LTO.cpp
  lld/MachO/Options.td
  lld/MachO/Relocations.cpp
  lld/MachO/UnwindInfoSection.cpp
  lld/include/lld/Common/Args.h
  lld/test/COFF/lto-cgo.ll
  lld/test/ELF/lto/cgo.ll
  lld/test/MachO/lto-cgo.ll
  lld/test/wasm/lto/cgo.ll
  lld/wasm/Config.h
  lld/wasm/Driver.cpp
  lld/wasm/LTO.cpp
  lld/wasm/Options.td

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