[ccache] preprocessing with -P

[Giulio Eulisse]

Maybe a better solution would be to remove lines with # when generating
the hash, but to keep them when compiling....

Ciao again,
Giulio
> 
> 
> 
> 
> Hello,
> 
> verwirren
> 
> I'm not sure, but If you are removing the path of include path in the
> preprocessed file - the debugger will be confused finding its source files - or
> what do you think?
> 
> 
> Mit freundlichen Gruessen
> best regards
> 
>    Heiko Elger
> 
> 
> 
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