[PATCH] Warn about dllexported explicit class template instantiation declarations (PR22035)

[Hans Wennborg]

Hi majnemer, rnk,

Clang would previously become confused and crash here.

It does not make a lot of sense to export these, so warning seems appropriate.

MSVC will export some member functions for this kind of specializations, whereas MinGW ignores the dllexport-edness. The latter behaviour seems better.

http://reviews.llvm.org/D6984

Files:
  include/clang/Basic/DiagnosticSemaKinds.td
  lib/Sema/SemaDeclCXX.cpp
  lib/Sema/SemaTemplate.cpp
  test/CodeGenCXX/dllexport.cpp
  test/SemaCXX/dllexport.cpp

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