Re: [PATCH 3/8] brcm80211: Add and use brcmX_dbg_dump_hex

[Joe Perches]

On Sun, 2012-01-15 at 10:17 +0100, Arend van Spriel wrote:
> On 01/15/2012 09:38 AM, Joe Perches wrote:
> 
> > +#ifdef DEBUG
> > +extern __printf(3, 4)
> 
> Just curious if I can learn something here. What does the __printf(3, 4) do?

It's a #define for gcc __attribute__((format (printf, ...)))
It makes gcc validate the printf format and arguments.

http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html


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