[PATCH] D23016: Enhance treatment of function specializations in friend declarations

[Serge Pavlov via cfe-commits]

sepavloff created this revision.
sepavloff added a subscriber: cfe-commits.

Function specializations used in friend declarations in class templates, like:
```
    template<typename T> class C1 {
        friend void func<>(int);
```
previously were processed incorrectly: class instantiation made them ordinary
functions and they were not placed into redeclaration chains correctly. This
change repairs specialization treatment.

This change fixes PR12994.

https://reviews.llvm.org/D23016

Files:
  lib/AST/DeclTemplate.cpp
  lib/Sema/SemaAccess.cpp
  lib/Sema/SemaTemplateInstantiateDecl.cpp
  test/SemaCXX/friend-spec.cpp

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