[llvm-bugs] [Bug 30601] New: Microsoft extensions allow to access private methods of template base class

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30601

            Bug ID: 30601
           Summary: Microsoft extensions allow to access private methods
                    of template base class
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: agutowski at google.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

The following code shouldn't compile (method "f" is private).

$ cat test.cpp
#include <stdio.h>

template<class T>
class Base {
  void f() { printf("private Base::f()\n"); }
};

template<class T>
struct Container : Base<T> {
  void g() { f(); }
};

int main() {
  Container<char> c;
  c.g();
  return 0;
}

$ clang test.cpp -o test.exe
test.cpp:10:14: warning: use of identifier 'f' found via unqualified lookup
into dependent bases of class templates is a Microsoft extension
[-Wmicrosoft-template]
  void g() { f(); }
             ^
             this->
test.cpp:15:5: note: in instantiation of member function 'Container<char>::g'
requested here
  c.g();
    ^
test.cpp:5:8: note: must qualify identifier to find this declaration in
dependent base class
  void f() { printf("private Base::f()\n"); }
       ^
1 warning generated.

$ test.exe
private Base::f()

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