compilation error regarding __cxa_call_terminate()

Using Clang head:

/usr/src/gnu/lib/libstdc++/../../../contrib/libstdc++/libsupc++/eh_call.cc:44:1: error:
       conflicting types for '__cxa_call_terminate'
__cxa_call_terminate(_Unwind_Exception* ue_header_)
^
/usr/src/gnu/lib/libstdc++/../../../contrib/libstdc++/libsupc++/unwind-cxx.h:136:17: note:
       previous declaration is here
extern "C" void __cxa_call_terminate (void*) __attribute__((noreturn));
                 ^