printf format strings to fix warnings

[Ralf Corsepius]

On 09/23/2013 11:57 PM, Joel Sherrill wrote:
> Hi
>
> There are only a handful of printf format warnings currently.
>
>        2  warning: format '%lc' expects argument of type 'wint_t', but
> argument 4 has type 'wchar_t' [-Wformat=]
>   
Can you provide a reproducer? Which targets?

This kind of warnings indicate a type mismatch between gcc's internal 
types and newlib.
Where and how to address this kind of warnings is close to impossible 
without knowing the target, because the origin can either be in newlib 
or in GCC.

Ralf