Re: [Qemu-devel] [PATCH 2/7] add strify() macros.

[Anthony Liguori <anthony@codemonkey.ws>]

Gerd Hoffmann wrote:
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>  osdep.h |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
>
> diff --git a/osdep.h b/osdep.h
> index ffbf221..ac660c8 100644
> --- a/osdep.h
> +++ b/osdep.h
> @@ -27,6 +27,11 @@
>  #define unlikely(x)   __builtin_expect(!!(x), 0)
>  #endif
>  
> +#ifndef strify
> +#define strify_i(a) # a
> +#define strify(a) strify_i(a)
> +#endif
> +
>   

Could get even fancier with something like:

#define strify_i(a) # a
#define strify(a) strify_i(a)

#define to_prop(a) __builtin_choose_expr( \
    __builtin_types_compatible_p(typeof(a), const char []), \
   (a), \
   __builtin_choose_expr( \
        __builtin_types_compatible_p(typeof(a), int) || \
        __builtin_types_compatible_p(typeof(a), double), \
        strify(a), \
        (int *)0))

It should be possible to use to_prop() for any property initializer.

Regards,

Anthony Liguori