Invalid operand 'unknown type' on pure virtual methods

[Emmanuel Millon]

Hi,

On a Linux OS v2.2.5 and with the gcc v2.95.2.19991024 (release), I'm
getting the following error:
invalid operands '{unknown type}' and '{unknown}' to binary operator ==,
 on the following sample (compiling with -O0 -g3 -Wall -fpermissive -c
flags):

( - fpermissive to avoid some problem like this "const
anyDeclarationWithNoType = 0;")

#include <iostream.h>
#include <stdlib.h>
class A
{
public:
     virtual void Test() = 0;
};

class B : public A
{
public:
     virtual void Test() { cout << "Test Class B" << endl; }
};

class C : public A
{
public:
     virtual void Test() { cout << "Test Class C" << endl; }
};

int main(int argc, char *argv[])
{
     A *a1,*a2;
     B b;
     C c;
     a1 = &b;
     a2 = &c;
     bool test = a1->Test==a2->Test; // I'm getting the error here!!!
     return 0;
}

Is there a special flag to disable this error?  (runs on CodeWarrior,
Visual C++...)
Thanks for any answer.