[cfe-dev] GCC and Clang produce undefined references to functions with vague linkage

[Rafael Espíndola]

> not well-formed C++, for it violates the one-definition rule in that it
> *lacks* a definition for the virtual member function foo::~foo().  Does
> it make any difference if you add a definition?

Unfortunately no. Replacing the declaration with an inline definition
produces a copy of it in undef.o, but we still get an undefined
reference to ~bar:

nm undef.o | grep D0
                 U _ZN3barD0Ev
0000000000000000 W _ZN3fooD0Ev


Cheers,
Rafael