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

[redi at gcc dot gnu.org]

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

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic
             Target|x86_64-apple-darwin14.4.0   |
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-05-03
     Ever confirmed|0                           |1

--- Comment #19 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Reduced:

struct RE
{
  virtual void rp()=0;
  void ax(){rp();}
};

struct BLKC
{
  virtual void rb(){}
};

template <typename T>
struct LK : BLKC
{
  T* p = nullptr;
  void rb() override { p->ax();}
};

template <typename>
struct AN : RE
{
  void rp() override {}
};

template <const char*>
struct LR
{
  virtual ~LR(){}
  struct LLC { virtual ~LLC(){} };
  LK<AN<LLC>> l;
};

constexpr char ET[]="";
struct I
{
  LR<ET> _e;
};

int main(){new I();}



$ g++  -Wall  67650.cc -O1 -fdevirtualize
67650.cc:22:8: warning: ‘void AN< <template-parameter-1-1> >::rp() [with
<template-parameter-1-1> = LR<(& ET)>::LLC]’ declared ‘static’ but never
defined [-Wunused-function]
   void rp() override {}
        ^~