[PATCH] D57438: [Sema][ObjC] Allow declaring ObjC pointer members in C++ unions under ARC

[Akira Hatanaka via Phabricator via cfe-commits]

ahatanak created this revision.
ahatanak added reviewers: rsmith, rjmccall, doug.gregor.
ahatanak added a project: clang.
Herald added subscribers: dexonsmith, jkorous.

ObjC pointer members are currently not allowed in unions in either C or C++ mode. This patch lifts the restriction in C++ mode.

This patch essentially treats ObjC pointer members the same way a non-static data member of a class type that has non-trivial special functions is treated. The ObjC pointer member causes all of the defaulted special functions of the union that directly contains the member to be defined as deleted, except when the member has an in-class initializer, the default constructor isn't defined as deleted.

rdar://problem/34213306


Repository:
  rC Clang

https://reviews.llvm.org/D57438

Files:
  include/clang/Basic/DiagnosticSemaKinds.td
  lib/AST/DeclCXX.cpp
  lib/Sema/SemaDecl.cpp
  lib/Sema/SemaDeclCXX.cpp
  test/SemaObjCXX/arc-0x.mm
  test/SemaObjCXX/objc-weak.mm

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