If a class has indirect private virtual base with non-trivial public destructor, a class cannot access its virtual base's destructor.

Example code:

struct A
{
    ~A(){}
};
 
struct B: virtual private A
{
    ~B() {}
};
 
struct C: public B
{
    ~C() {}
};

Result:

prog.cc:11:8: error: inherited virtual base class 'A' has private destructor
struct C: public B
       ^
prog.cc:6:11: note: declared private here
struct B: virtual private A

GCC accept this code.
Clang until 3.3 accept this code.
Clang 3.4 and later reject this code.