From mboxrd@z Thu Jan  1 00:00:00 1970
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Subject: Re: [PATCH 1/3] mini-os: add BUILD_BUG_ON()
Date: Wed, 2 Jul 2014 18:10:20 +0200
Message-ID: <20140702161019.GA6022@type>
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To: Jan Beulich <JBeulich@suse.com>
Cc: xen-devel <xen-devel@lists.xenproject.org>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>
List-Id: xen-devel@lists.xenproject.org

Jan Beulich, le Wed 02 Jul 2014 15:25:25 +0100, a =E9crit :
> Just copy over what the hypervisor currently uses.
> =

> Signed-off-by: Jan Beulich <jbeulich@suse.com>

Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

> --- a/extras/mini-os/include/lib.h
> +++ b/extras/mini-os/include/lib.h
> @@ -54,6 +54,20 @@
>  #include <xen/event_channel.h>
>  #include "gntmap.h"
>  =

> +#if __GNUC__ > 4 || (__GNUC__ =3D=3D 4 && __GNUC_MINOR__ >=3D 6)
> +/* Force a compilation error if condition is true */
> +#define BUILD_BUG_ON(cond) ({ _Static_assert(!(cond), "!(" #cond ")"); })
> +/* Force a compilation error if condition is true, but also produce a
> +   result (of value 0 and type size_t), so the expression can be used
> +   e.g. in a structure initializer (or where-ever else comma expressions
> +   aren't permitted). */
> +#define BUILD_BUG_ON_ZERO(cond) \
> +    sizeof(struct { _Static_assert(!(cond), "!(" #cond ")"); })
> +#else
> +#define BUILD_BUG_ON_ZERO(cond) sizeof(struct { int:-!!(cond); })
> +#define BUILD_BUG_ON(cond) ((void)BUILD_BUG_ON_ZERO(cond))
> +#endif
> +
>  #ifdef HAVE_LIBC
>  #include <sys/queue.h>
>  #include <stdio.h>
> =

> =

> =


> mini-os: add BUILD_BUG_ON()
> =

> Just copy over what the hypervisor currently uses.
> =

> Signed-off-by: Jan Beulich <jbeulich@suse.com>
> =

> --- a/extras/mini-os/include/lib.h
> +++ b/extras/mini-os/include/lib.h
> @@ -54,6 +54,20 @@
>  #include <xen/event_channel.h>
>  #include "gntmap.h"
>  =

> +#if __GNUC__ > 4 || (__GNUC__ =3D=3D 4 && __GNUC_MINOR__ >=3D 6)
> +/* Force a compilation error if condition is true */
> +#define BUILD_BUG_ON(cond) ({ _Static_assert(!(cond), "!(" #cond ")"); })
> +/* Force a compilation error if condition is true, but also produce a
> +   result (of value 0 and type size_t), so the expression can be used
> +   e.g. in a structure initializer (or where-ever else comma expressions
> +   aren't permitted). */
> +#define BUILD_BUG_ON_ZERO(cond) \
> +    sizeof(struct { _Static_assert(!(cond), "!(" #cond ")"); })
> +#else
> +#define BUILD_BUG_ON_ZERO(cond) sizeof(struct { int:-!!(cond); })
> +#define BUILD_BUG_ON(cond) ((void)BUILD_BUG_ON_ZERO(cond))
> +#endif
> +
>  #ifdef HAVE_LIBC
>  #include <sys/queue.h>
>  #include <stdio.h>


-- =

Samuel
<s> je la connaissais pas celle la : "make: Entering an unknown directory"
 -+- #ens-mim -+-