[PATCH v2] common/sfc: replace out of bounds condition with static_assert

[Stephen Hemminger]

On Wed, 7 Feb 2024 19:10:37 +0000
Ferruh Yigit <ferruh.yigit at amd.com> wrote:

> On 1/19/2024 10:13 PM, Stephen Hemminger wrote:
> > The sfc base code had its own definition of static assertions
> > using the out of bound array access hack. Replace it with a
> > static_assert like rte_common.h.
> > 
> > Fixes: f67e4719147d ("net/sfc/base: fix coding style")
> > Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>
> > Acked-by: Morten Brørup <mb at smartsharesystems.com>
> > ---
> > v2 - add assert.h to make sure it works in other environments
> > 
> >  drivers/common/sfc_efx/base/efx.h | 6 ++++--
> >  1 file changed, 4 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/common/sfc_efx/base/efx.h b/drivers/common/sfc_efx/base/efx.h
> > index 3312c2fa8f81..38f2aed3e336 100644
> > --- a/drivers/common/sfc_efx/base/efx.h
> > +++ b/drivers/common/sfc_efx/base/efx.h
> > @@ -7,6 +7,8 @@
> >  #ifndef	_SYS_EFX_H
> >  #define	_SYS_EFX_H
> >  
> > +#include <assert.h>
> > +
> >  #include "efx_annote.h"
> >  #include "efsys.h"
> >  #include "efx_types.h"
> > @@ -17,8 +19,8 @@
> >  extern "C" {
> >  #endif
> >  
> > -#define	EFX_STATIC_ASSERT(_cond)		\
> > -	((void)sizeof (char[(_cond) ? 1 : -1]))
> > +#define	EFX_STATIC_ASSERT(_cond) \
> > +	do { static_assert((_cond), "assert failed" #_cond); } while (0)
> >  
> >  #define	EFX_ARRAY_SIZE(_array)			\
> >  	(sizeof (_array) / sizeof ((_array)[0]))  
> 
> Getting following build error with clang:

What version of clang?
It works for me with clang 16.0.6