gcc strange C++ bug, the following code dot not compile.

[John (Eljay) Love-Jensen]

Hi Benny,

Your question is off-topic for the GCC-help forum.  Your question is a
general C++ question.  I do not say this to chastise you, but to help you
get your questions answered faster and accurately in a more appropriate
forum.

That being said...

The B::a routine hides the other signatures of the overloaded A::a routines.

If you want to bring the A::a routines forward, you need to explicitly say
so.

You do that by specifying 'using A::a;' in class B:

class B : public A
{
public:
  using A::a;
  void a()
  {
  }
};

HTH,
--Eljay