[PATCH] D145208: [COFF] Add MC support for emitting IMAGE_WEAK_EXTERN_ANTI_DEPENDENCY symbols

[Eli Friedman via Phabricator via llvm-commits]

efriedma created this revision.
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This is mostly useful for ARM64EC, which uses such symbols extensively.

One interesting quirk of ARM64EC is that we need to be able to emit weak symbols that point at each other (so if either symbol is defined elsewhere, both symbols point at the definition).  This required a few changes to the way we handle weak symbols on Windows to avoid recursively visiting weak symbols.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D145208

Files:
  llvm/include/llvm/MC/MCDirectives.h
  llvm/include/llvm/MC/MCSymbol.h
  llvm/include/llvm/MC/MCSymbolCOFF.h
  llvm/lib/MC/MCAsmStreamer.cpp
  llvm/lib/MC/MCELFStreamer.cpp
  llvm/lib/MC/MCExpr.cpp
  llvm/lib/MC/MCMachOStreamer.cpp
  llvm/lib/MC/MCParser/AsmParser.cpp
  llvm/lib/MC/MCParser/COFFAsmParser.cpp
  llvm/lib/MC/MCWinCOFFStreamer.cpp
  llvm/lib/MC/WinCOFFObjectWriter.cpp
  llvm/test/MC/COFF/alias.s
  llvm/test/MC/COFF/weak-anti-dep.s

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