Protected friend function in parent class will not compile

[llvmbot]

Bugzilla Link	19686
Version	3.4
OS	MacOS X
Reporter	LLVM Bugzilla Contributor
CC	@DougGregor

Extended Description

Steps to Reproduce:
Compile the following code:

    class A {
    protected:
        void ProtectedMemberFunc() {}
    };

    class B : public A {
        friend void A::ProtectedMemberFunc();
    };

Expected result:
The code compiles without error.

Actual result:
The following error is raised:

main.cpp:8:20: error: friend function 'ProtectedMemberFunc' is a protected member of 'A'
    friend void A::ProtectedMemberFunc();
                ~~~^
main.cpp:8:20: note: must name member using the type of the current context 'B'

Additional Notes:
Exact version: Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
Similar to bug http://llvm.org/bugs/show_bug.cgi?id=6840

[llvmbot]

@llvm/issue-subscribers-clang-frontend

Author: None (llvmbot)

| | | | --- | --- | | Bugzilla Link | [19686](https://llvm.org/bz19686) | | Version | 3.4 | | OS | MacOS X | | Reporter | LLVM Bugzilla Contributor | | CC | @DougGregor |

Extended Description

Steps to Reproduce:
Compile the following code:

    class A {
    protected:
        void ProtectedMemberFunc() {}
    };

    class B : public A {
        friend void A::ProtectedMemberFunc();
    };

Expected result:
The code compiles without error.

Actual result:
The following error is raised:

main.cpp:8:20: error: friend function 'ProtectedMemberFunc' is a protected member of 'A'
    friend void A::ProtectedMemberFunc();
                ~~~^
main.cpp:8:20: note: must name member using the type of the current context 'B'

Additional Notes:
Exact version: Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
Similar to bug http://llvm.org/bugs/show_bug.cgi?id=6840

[shafik]

Looks like a bug to me, EDG/MSVC accept but gcc does not: https://godbolt.org/z/rxn4xr6Kr