Bug#423156: ext/codecvt_specializations.h is not -Wall clean

[Matthias Klose <doko@cs.tu-berlin.de>]

tag 423156 + moreinfo
thanks

Jens-Wolfhard Schicke writes:
> Package: libstdc++6-4.1-dev
> Version: 4.1.2-6
> 
> In Line 246ff, it says:
> 
>        explicit
>        codecvt(state_type& __enc, size_t __refs = 0)
>        : __codecvt_abstract_base<intern_type, extern_type, 
> state_type>(__refs)
>        { }
> 
> Using -Wall, one gets an "unused parameter" warning for __enc.
> 
> One solution would be to remove the __enc, and just leave the type. 
> (However I don't know where the encoding information is passed to then...)

please provide a testcase,  a simple

#include <locale>
#include <cstdlib>
#include <string>
#include <ext/codecvt_specializations.h>

doesn't show any warning.