[PATCH] D37162: [CodeView] Don't output S_UDT records for incomplete typedefs

[Zachary Turner via Phabricator via llvm-commits]

zturner created this revision.
Herald added a subscriber: hiraditya.

Preivously we would output S_UDT records for typedefs that pointed to forward decls.  This does not match the behavior of MSVC, so we update S_UDT records to always point to full decls.  However, there are some cases where a full decl is not available, so in this case we now drop these S_UDT records entirely since they are of no help.  Some tests indicate that this patch closes about 20% of the gap between clang-cl and MSVC in terms of /DEBUG:FASTLINK PDB size.


https://reviews.llvm.org/D37162

Files:
  llvm/include/llvm/DebugInfo/CodeView/TypeRecord.h
  llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
  llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.h
  llvm/test/DebugInfo/COFF/purge-typedef-udts.ll

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