[PATCH] D84005: Introduce ns_error_domain attribute.

[Michael Forster via Phabricator via cfe-commits]

MForster created this revision.
MForster added reviewers: gribozavr2, milseman.
Herald added a reviewer: aaron.ballman.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

This is chery-picked from https://github.com/llvm/llvm-project-staging/commit/a14779f504b02ad0e4dbc39d6d10cadc7ed4cfd0
and adapted to updated Clang APIs.

ns_error_domain can be used by, e.g. NS_ERROR_ENUM, in order to
identify a global declaration representing the domain constant.

Introduces the attribute, Sema handling, diagnostics, and test case.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D84005

Files:
  clang/include/clang/Basic/Attr.td
  clang/include/clang/Basic/AttrDocs.td
  clang/include/clang/Basic/DiagnosticSemaKinds.td
  clang/lib/Sema/SemaDeclAttr.cpp
  clang/test/Analysis/ns_error_enum.m

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