[PATCH] D152785: [COFF] Support -gsplit-dwarf for COFF on Windows

[Haohai, Wen via Phabricator via cfe-commits]

HaohaiWen created this revision.
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D152340 <https://reviews.llvm.org/D152340> has split WinCOFFObjectWriter to WinCOFFWriter. This patch adds
another WinCOFFWriter as DwoWriter to write Dwo sections to dwo file.
Driver options are also updated accordingly to support -gsplit-dwarf in
CL mode.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D152785

Files:
  clang/include/clang/Driver/Options.td
  clang/lib/Driver/Driver.cpp
  clang/lib/Driver/ToolChains/Clang.cpp
  clang/lib/Driver/ToolChains/CommonArgs.cpp
  clang/test/Driver/split-debug.c
  llvm/include/llvm/MC/MCWinCOFFObjectWriter.h
  llvm/lib/DebugInfo/DWARF/DWARFContext.cpp
  llvm/lib/MC/MCAsmBackend.cpp
  llvm/lib/MC/WinCOFFObjectWriter.cpp
  llvm/test/DebugInfo/COFF/dwarf-headers.ll
  llvm/test/DebugInfo/COFF/fission-cu.ll
  llvm/test/DebugInfo/COFF/fission-sections.ll

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