Em Thu, Feb 09, 2017 at 07:02:06PM -0800, Joe Perches escreveu:
> On Thu, 2017-02-09 at 22:39 -0300, Arnaldo Carvalho de Melo wrote:
> > From: Arnaldo Carvalho de Melo <[email protected]>
> >
> > For cases where implicit fall through case labels are intended,
> > to let us inform that to gcc >= 7:
>
> I believe this should be added to compiler_gcc.h
We still don't have it in tools/include/linux, but yeah, its a good idea
to have the equivalent of include/linux/compiler-gcc.h.
Then, at some point, the kernel can grab the definition from tools, i.e.
when people start trying to build the kernel _and_ this specific warning
is enabled there, as it is in tools/.
- Arnaldo
> > diff --git a/tools/include/linux/compiler.h b/tools/include/linux/compiler.h
> []
> > @@ -126,4 +126,13 @@ static __always_inline void __write_once_size(volatile
> > void *p, void *res, int s
> > #define WRITE_ONCE(x, val) \
> > ({ union { typeof(x) __val; char __c[1]; } __u = { .__val = (val) };
> > __write_once_size(&(x), __u.__c, sizeof(x)); __u.__val; })
> >
> > +
> > +#ifndef __fallthrough
> > +# if defined(__GNUC__) && __GNUC__ >= 7
> > +# define __fallthrough __attribute__ ((fallthrough))
> > +# else
> > +# define __fallthrough
> > +# endif
> > +#endif
> > +
> > #endif /* _TOOLS_LINUX_COMPILER_H */
