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From: "rohan at rohanlean dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/62240] New: A using-declaration within a class can publish a public base of a private base.
Date: Sat, 23 Aug 2014 14:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62240

            Bug ID: 62240
           Summary: A using-declaration within a class can publish a
                    public base of a private base.
           Product: gcc
           Version: 4.9.1
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rohan at rohanlean dot de

Created attachment 33384
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33384&action=edit
small testcase

Suppose that three classes are related by inheritance (B ---> A : B inherits
from A) as follows:

  C ---private--> B ---public--> A

Then C can publish A via

  using B::A;

I think that the correct behaviour is to reject such a program.