Re: [Xen-devel] [PATCH v3 3/5] libxl: add support for FreeBSD uuid implementation

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 19/06/14 17:32, Roger Pau Monne wrote:
> Add the FreeBSD specific uuid implementation. Since uuid_t is not
> defined as an array, but as a struct on FreeBSD, use a union with a
> array in order to be able to return the uuid as a bytearray.
>
> Also, added a libxl internal compile time assert macro, that is used
> to assert that the size of uuid_t is the same as the union used in
> libxl.
>
> Signed-off-by: Roger Pau Monnà <roger.pau@xxxxxxxxxx>
> Cc: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
> Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
> ---
> Changes since v2:
>  - Unify the FreeBSD and NetBSD uuid implementations as much as
>    possible.
> ---
>  tools/libxl/libxl_internal.h |    4 ++++
>  tools/libxl/libxl_uuid.c     |   40 ++++++++++++++++++++++++++++++++--------
>  tools/libxl/libxl_uuid.h     |   12 +++++++-----
>  3 files changed, 43 insertions(+), 13 deletions(-)
>
> diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
> index a0d4f24..0784403 100644
> --- a/tools/libxl/libxl_internal.h
> +++ b/tools/libxl/libxl_internal.h
> @@ -3179,6 +3179,10 @@ int libxl__uint64_parse_json(libxl__gc *gc, const 
> libxl__json_object *o,
>                               void *p);
>  int libxl__string_parse_json(libxl__gc *gc, const libxl__json_object *o,
>                               char **p);
> +/*
> + * Compile time assertion
> + */
> +#define BUILD_BUG_ON(p) ((void)sizeof(char[1 - 2 * !!(p)]))
>  

Please prefer _Static_assert if available.

c/s d5a3bc1a214 is the way I did this for libxc.

~Andrew

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