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From: "xinliangli at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/60899] undef reference generated with -fdevirtualize-speculatively
Date: Sun, 20 Apr 2014 07:10:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60899

--- Comment #4 from davidxl <xinliangli at gmail dot com> ---
(In reply to davidxl from comment #3)
> (In reply to Jan Hubicka from comment #2)
> > David,
> > it seems a_m.C should be different form a.C.  From chain of events you
> > describe I think
> > we need to figure out why the last folding happens.  Does the function pass 
> > can_refer_decl_in_current_unit_p and if so, how does cgraph node look at
> > that time?
> > 
> > Honza
> 
> Cut & paste error:
> 
> // a_m.cc
> 
> #include "a.h"
> struct D2: public DI {
>   virtual int doit () { return 3; }
> };
> 
> extern int bar(DI*);
> int main()
> {
>   D2 d2;
>   return bar(&d2);
> }


stepping into can_refer_decl_in_current_unit_p indicates it returns true (for
A::foo and A::vtable) at the condition @line 106.