[Bug c++/17874] New: Reference to member of protected base should be an error

[kerch at cup dot hp dot com]

Referencing the member function "l" in the below example should
not be allowed. The friend relationship that "A" has to "C" is
not inherited in "B" (see 11.4 P8).

class A {
public:
    void l();
    friend class C;
};

class B : protected A {
};

class C {
    void v(B * g) { g->l(); }
}; 
class C {
     void v(B * g) {
       g->l();                      // Error -- referencing member in B,
                    // or cast to base and reference in A,
                    // which is the same as the following:
       (static_cast<A *>(g))->l();  // Error -- can't cast to protected base
       ((A *)g)->l();               // Okay -- old-style cast ignores access
       A *p;
       p->l();                      // Okay -- referencing member in A
     }
};

-- 
           Summary: Reference to member of protected base should be an error
           Product: gcc
           Version: 3.4.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: kerch at cup dot hp dot com
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17874