Re: [PATCH] include: <linux/build_bug.h>: define static_assert

[Sascha Hauer <sha@pengutronix.de>]

On Thu, Dec 09, 2021 at 11:58:17AM +0100, Ahmad Fatoum wrote:
> BUILD_BUG_ON can't be used outside of a function, unlike static_assert.
> Import the macro definition.
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
> ---
>  include/linux/build_bug.h | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)

Applied, thanks

Sascha

> 
> diff --git a/include/linux/build_bug.h b/include/linux/build_bug.h
> index 43d1fd50d433..40cd504f63ba 100644
> --- a/include/linux/build_bug.h
> +++ b/include/linux/build_bug.h
> @@ -80,4 +80,23 @@
>  
>  #endif	/* __CHECKER__ */
>  
> +/**
> + * static_assert - check integer constant expression at build time
> + *
> + * static_assert() is a wrapper for the C11 _Static_assert, with a
> + * little macro magic to make the message optional (defaulting to the
> + * stringification of the tested expression).
> + *
> + * Contrary to BUILD_BUG_ON(), static_assert() can be used at global
> + * scope, but requires the expression to be an integer constant
> + * expression (i.e., it is not enough that __builtin_constant_p() is
> + * true for expr).
> + *
> + * Also note that BUILD_BUG_ON() fails the build if the condition is
> + * true, while static_assert() fails the build if the expression is
> + * false.
> + */
> +#define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
> +#define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
> +
>  #endif	/* _LINUX_BUILD_BUG_H */
> -- 
> 2.30.2
> 
> 
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