[Bug c++/95677] undefined reference to `(anonymous namespace)::xx'

["sujian.liu at huawei dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95677

--- Comment #2 from liusujian <sujian.liu at huawei dot com> ---
(In reply to Richard Biener from comment #1)
> It's more likely the GENERIC / cgraph output by the C++ frontend is not
> correct
> and works by accident without LTO.  Initial symbol table:
> 
> Initial Symbol table:
> 
> int {anonymous}::xx/3 (int {anonymous}::xx) @0x7f615d2d8180
>   Type: variable
>   Visibility: external
>   References:
>   Referring: _ZN12_GLOBAL__N_13fooEv/0 (write)
>   Availability: not-ready
>   Varpool flags:
> main/2 (int main()) @0x7f615d421168
>   Type: function definition analyzed
>   Visibility: force_output no_reorder public
>   Aux: @0x37a5000
>   References: int {anonymous}::xx/1 (write)
>   Referring:
>   Function flags: body
>   Called by:
>   Calls:
> int {anonymous}::xx/1 (int {anonymous}::xx) @0x7f615d2d8100
>   Type: variable definition analyzed
>   Visibility: force_output no_reorder
>   Aux: @0x7f615d421168
>   References:
>   Referring: main/2 (write)
>   Availability: not-ready
>   Varpool flags: initialized
> _ZN12_GLOBAL__N_13fooEv/0 (void {anonymous}::foo()) @0x7f615d421000
>   Type: function definition analyzed
>   Visibility: force_output no_reorder
>   Aux: @0x7f615d2d8100
>   References: int {anonymous}::xx/3 (write)
>   Referring:
>   Function flags: body
>   Called by:
>   Calls:
> 
> where you can see there are actually two 'xx' objects and the C++ FE
> takes it up to the linker/assembler to resolve them.  But the symtab
> code does not include such "resolving" step.


In other words, C++ is currently unable to deal with this scenario ? Or any
other problems cause the error?