[PATCH] Warn on zero-sized structures inside extern "C" block (PR5065)

[Serge Pavlov]

sepavloff added you to the CC list for the revision "Warn on zero-sized structures inside extern "C" block (PR5065)".

Hi rsmith,

This patch adds warning on structures/unions that are empty or contain
only bit fields of zero size. Warnings are generated in C++ mode and
if only such type is defined inside extern "C" block.
The patch fixed PR5065.

http://llvm-reviews.chandlerc.com/D2151

Files:
  include/clang/AST/DeclBase.h
  include/clang/Basic/DiagnosticGroups.td
  include/clang/Basic/DiagnosticSemaKinds.td
  lib/AST/Decl.cpp
  lib/AST/DeclBase.cpp
  lib/Sema/SemaDecl.cpp
  test/CXX/basic/basic.lookup/basic.lookup.argdep/p2.cpp
  test/SemaCXX/extern-c.cpp
  test/SemaCXX/storage-class.cpp
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