[PATCH] D124666: In MSVC compatibility mode, handle unqualified templated base class initialization

[Fred Tingaud via Phabricator via cfe-commits]

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Before C++20, MSVC was supporting not mentioning the template argument of the base class when initializing a class inheriting a templated base class.
So the following code compiled correctly:

  template <class T>
  class Base {
  };
  
  template <class T>
  class Derived : public Base<T> {
  public:
    Derived() : Base() {}
  };
  
  void test() {
      Derived<int> d;
  }

See https://godbolt.org/z/Pxxe7nccx for a conformance view.

This patch adds support for such construct when in MSVC compatibility mode.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D124666

Files:
  clang/include/clang/Basic/DiagnosticSemaKinds.td
  clang/lib/Sema/SemaDeclCXX.cpp
  clang/test/SemaTemplate/ms-unqualified-base-class.cpp

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