[Bug c++/57208] Latest chromium compilation fails with enabled LTO

[hubicka at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57208

--- Comment #23 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
It seems late optimizers translate

cloning Bind to
_ZN4base4BindIMN3net12_GLOBAL__N_113DnsTCPAttemptEFviENS_8internal17UnretainedWrapperIS3_EEEENS_8CallbackINS6_9BindStateINS6_13FunctorTraitsIT_E12RunnableTypeENSD_7RunTypeEFvNS6_19CallbackParamTraitsIT0_E11StorageTypeEEE14UnboundRunTypeEEESC_RKSH_.constprop.12480
Bind (struct 
{       
  void DnsTCPAttempt::<T2bc0a> (struct DnsTCPAttempt *, int) * __pfn;
  long int __delta;
} functor, const struct UnretainedWrapper & p1)
{       
  void DnsTCPAttempt::<T2bc0a> (struct DnsTCPAttempt *, int) * method$__pfn;
  long int method$__delta;

  <bb 2>:
  method$__pfn_10 = MEM[(const struct  &)&functor];
  method$__delta_11 = MEM[(const struct  &)&functor + 8];
  _5 = operator new (40);
  _12 = &MEM[(struct RefCountedThreadSafe *)_5 + 8B].D.4332;
  __base_ctor  (_12);
  MEM[(struct BindStateBase *)_5]._vptr.BindStateBase = &MEM[(void
*)&_ZTVN4base8internal13BindStateBaseE + 16B];
  MEM[(struct BindState *)_5].D.961227._vptr.BindStateBase = &MEM[(void
*)&_ZTVN4base8internal9BindStateINS0_15RunnableAdapterIMN3net12_GLOBAL__N_113DnsTCPAttemptEFviEEEFvPS5_iEFvNS0_17UnretainedWrapperIS5_EEEEE
+ 16B];
  MEM[(struct BindState *)_5 + 16B] = method$__pfn_10;
  MEM[(struct BindState *)_5 + 24B] = method$__delta_11;
  MEM[(struct BindState *)_5].p1_ = *p1_6(D);
  _13 = &_8(D)->D.42504;
  __base_ctor  (_13, _5);
  _8(D)->D.42504.polymorphic_invoke_ = Run;
  return _8(D);

}

into 
        .globl 
_ZN4base4BindIMN3net12_GLOBAL__N_113DnsTCPAttemptEFviENS_8internal17UnretainedWrapperIS3_EEEENS_8CallbackINS6_9BindStateINS6_13FunctorTraitsIT_E12RunnableTypeENSD_7RunType
        .hidden
_ZN4base4BindIMN3net12_GLOBAL__N_113DnsTCPAttemptEFviENS_8internal17UnretainedWrapperIS3_EEEENS_8CallbackINS6_9BindStateINS6_13FunctorTraitsIT_E12RunnableTypeENSD_7RunType
        .type  
_ZN4base4BindIMN3net12_GLOBAL__N_113DnsTCPAttemptEFviENS_8internal17UnretainedWrapperIS3_EEEENS_8CallbackINS6_9BindStateINS6_13FunctorTraitsIT_E12RunnableTypeENSD_7RunType
_ZN4base4BindIMN3net12_GLOBAL__N_113DnsTCPAttemptEFviENS_8internal17UnretainedWrapperIS3_EEEENS_8CallbackINS6_9BindStateINS6_13FunctorTraitsIT_E12RunnableTypeENSD_7RunTypeEFvNS6_19Callbac
.LFB10639:
        .cfi_startproc
        pushq   %rbp
        .cfi_def_cfa_offset 16
        .cfi_offset 6, -16
        movq    %rcx, %rbp
        pushq   %rbx
        .cfi_def_cfa_offset 24
        .cfi_offset 3, -24
        movq    %rdi, %rbx
        movl    $40, %edi
        subq    $8, %rsp
        .cfi_def_cfa_offset 32
        call    _Znwm@PLT
        movl    $0, 8(%rax)
        movq    %rax, %rsi
        leaq   
16+_ZTVN4base8internal9BindStateINS0_15RunnableAdapterIMN3net12_GLOBAL__N_113DnsTCPAttemptEFviEEEFvPS5_iEFvNS0_17UnretainedWrapperIS5_EEEEE.lto_priv.73096(%rip),
%rax
        movq    $0, 24(%rsi)
        movq    %rbx, %rdi
        movq    %rax, (%rsi)
        leaq    _ZN3net12_GLOBAL__N_113DnsTCPAttempt12OnIOCompleteEi(%rip),
%rax
        movq    %rax, 16(%rsi)
        movq    0(%rbp), %rax
        movq    %rax, 32(%rsi)
        call    _ZN4base8internal12CallbackBaseC2EPNS0_13BindStateBaseE
        leaq   
_ZN4base8internal7InvokerILi1ENS0_9BindStateINS0_15RunnableAdapterIMN3net12_GLOBAL__N_113DnsTCPAttemptEFviEEEFvPS6_iEFvNS0_17UnretainedWrapperIS6_EEEEESB_E3RunEPNS0_13Bind
       movq    %rax, 8(%rbx)
        addq    $8, %rsp
        .cfi_def_cfa_offset 24 
        movq    %rbx, %rax
        popq    %rbx
        .cfi_def_cfa_offset 16
        popq    %rbp
        .cfi_def_cfa_offset 8
        ret
        .cfi_endproc
.LFE10639:

So someone folds
  MEM[(struct BindStateBase *)_5]._vptr.BindStateBase = &MEM[(void
*)&_ZTVN4base8internal13BindStateBaseE + 16B];
  MEM[(struct BindState *)_5].D.961227._vptr.BindStateBase = &MEM[(void
*)&_ZTVN4base8internal9BindStateINS0_15RunnableAdapterIMN3net12_GLOBAL__N_113DnsTCPAttemptEFviEEEFvPS5_iEFvNS0_17UnretainedWrapperIS5_EEEEE
+ 16B];
  MEM[(struct BindState *)_5 + 16B] = method$__pfn_10;
  MEM[(struct BindState *)_5 + 24B] = method$__delta_11;
  MEM[(struct BindState *)_5].p1_ = *p1_6(D);

into reference to the symbol that is in other ltrans and not seen by
partitioning...