Re: [kvm-unit-tests PATCH 1/4] lib: *printf: warn on format/arg mismatch

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On Tue, Mar 01, 2016 at 11:43:06AM +0100, Paolo Bonzini wrote:
> 
> 
> On 29/02/2016 21:19, Andrew Jones wrote:
> > Suggested-by: Thomas Huth <thuth@xxxxxxxxxx>
> > Signed-off-by: Andrew Jones <drjones@xxxxxxxxxx>
> > ---
> >  lib/libcflat.h | 12 +++++++-----
> >  1 file changed, 7 insertions(+), 5 deletions(-)
> > 
> > diff --git a/lib/libcflat.h b/lib/libcflat.h
> > index 39100f29713b8..ce09d34e658b3 100644
> > --- a/lib/libcflat.h
> > +++ b/lib/libcflat.h
> > @@ -51,13 +51,15 @@ typedef _Bool		bool;
> >  extern void puts(const char *s);
> >  extern void exit(int code);
> >  extern void abort(void);
> > -
> > -extern int printf(const char *fmt, ...);
> > -extern int snprintf(char *buf, int size, const char *fmt, ...);
> > -extern int vsnprintf(char *buf, int size, const char *fmt, va_list va);
> > -extern int vprintf(const char *fmt, va_list va);
> >  extern long atol(const char *ptr);
> >  
> > +#define _f(i,j) __attribute__((format(printf, i, j)))
> 
> Please name this ATTRIBUTE_PRINTF.

Do you want me to keep it defined? I used _f, only because it's short,
keeping it from bloating the below lines, and then I undef'ed it when
it no longer had any purpose. If we'd rather not using something like
_f for the name, then I think we might as well just use the
__attribute__ string as is.

Thanks,
drew

> 
> Paolo
> 
> > +extern int printf(const char *fmt, ...) _f(1,2);
> > +extern int snprintf(char *buf, int size, const char *fmt, ...) _f(3,4);
> > +extern int vsnprintf(char *buf, int size, const char *fmt, va_list va) _f(3,0);
> > +extern int vprintf(const char *fmt, va_list va) _f(1,0);
> > +#undef _f
> > +
> >  extern void report_prefix_push(const char *prefix);
> >  extern void report_prefix_pop(void);
> >  extern void report(const char *msg_fmt, bool pass, ...);
> > 
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