[PATCH] D130857: [Clang] Plan 9 member resolution

[Keegan Saunders via Phabricator via cfe-commits]

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This patch implements the Plan 9 member resolution algorithm which is described referenced in the original revision: https://reviews.llvm.org/D127462. The test code is illustrative as to what is considered valid, as it was derived from samples compiled using the Plan 9 C compiler.

It is not clear what the policy on issuing diagnostics is for extensions usage, so there is a warning emitted for usage of duplicated members (which is a Plan 9 extension). However this might not be a good idea, as there could be potentially a large number of warnings emitted, as this is used throughout headers Plan 9 C.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D130857

Files:
  clang/include/clang/Basic/DiagnosticGroups.td
  clang/include/clang/Basic/DiagnosticSemaKinds.td
  clang/lib/AST/Expr.cpp
  clang/lib/Sema/SemaDecl.cpp
  clang/lib/Sema/SemaLookup.cpp
  clang/test/Sema/2c-anon-record.c

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