Strange warning while building the current libstdc++ library

[Benjamin Kosnik]

>    __cxa_call_unexpected(_Unwind_Exception*)':
> ../../../../gcc/libstdc++-v3/libsupc++/eh_personality.cc:560: warning: new 
>    declaration `void __cxa_call_unexpected(_Unwind_Exception*)'
> ../../../../gcc/libstdc++-v3/libsupc++/eh_personality.cc:560: warning: ambiguates
>    built-in declaration `void __cxa_call_unexpected(void*)'
> 
> Does this message indicate a problem?

You'd think so....

I don't know what's up with this one.