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Re: [c-common.c] warnings: -Wformat and -Wnonnull

> | Not sure what to do about this one though:
> | 
> |   if (warn_format || warn_missing_format_attribute)
> |       check_function_format (attrs, params);
> 
> could we leave it as is?  Or do you see some potential confusion?

I meant, which OPT_* to pass to warning() for the warnings within
check_function_format().

I don't plan on changing the logic for when it's enabled.
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