gdb 4.18 cannot resolve virtual method (with gcc-2.95.2)

[Shankha S. Mitra]

When debugging a program built with gcc-2.95.2 on a Sparc/Solaris 2.6
machine and accessing a virtual function, I get:
    Cannot resolve method C::a to any overloaded instance

A very simple testcase follows.  Here's the gdb banner:

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Here's the transcript of the gdb session:

(gdb) info br
Num Type           Disp Enb Address    What
1   breakpoint     keep y   0x00029b34 in B::a(void) at test.cc:11
(gdb) run
Breakpoint 1, B::a (this=0xffbef520) at test.cc:11
11          virtual void a() { cout << "B::a()" << endl; }
(gdb) up 2
#2  0x1ab8c in main () at test.cc:31
31          trythis(b);
(gdb) p c.a()
Cannot resolve method C::a to any overloaded instance



Here's the testcase:
#include <iostream>

struct A 
{
    virtual void a() = 0;
};


struct B : A
{
    virtual void a() { cout << "B::a()" << endl; }
};

struct C : A
{
    virtual void a() { cout << "C::a()" << endl; }
};


void trythis(A& a)
{
    a.a();
}


main()
{
    B b;
    C c;

    trythis(b);
    trythis(c);
}