[Bug c++/67650] undef reference with -fdevirtualize

[vincent.lextrait at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67650

--- Comment #27 from Vincent <vincent.lextrait at gmail dot com> ---
Sorry for the silly check, are you sure you are trying with -O3 or
-fdevirtualize -O2? 

You can try this with 8.1:

void *v;

template <typename T>
struct LK: public BLKC
{
  void rb(){((T*)v)->ax();}
  static T* st;
};

As a replacement to the call to null, and the missing definition problem is
reported.

(In reply to Jonathan Wakely from comment #26)
> (In reply to Vincent from comment #25)
> > Oh, it used to be the case. I think that must be due to some additional
> > artefact of more recent compilers. I'll try to find another way to show it.
> 
> I tried 5.1.0 and 5.2.0 and several other previous releases, they all link
> the program successfully, with just this warning:
> 
> main.cpp:53:8: warning: 'I' has a field 'I::_e' whose type uses the
> anonymous namespace