Introducing ELF2.0

[The Cuthour]

Hi

>> The goal here is Relinkability. Even in object-oriented languages,
>> binary Relinkability should be a given.  [...]
> 
> You have identified a Solution but not a Problem.

Suppose we have the following two classes:

=== Vec.h ===
class Vec {
     int x, y, z;
};
=== end Vec.h ===

=== Pix.h ===
class Pix: Vec {
     int r, g, b;
};
=== end Pix.h ===

If we add or remove a member variable in class Vec, it requires
recompiling not only Vec.cc but also Pix.cc. I believe this is
a problem. Pix.o should be relinkable.