bhyve: fix bhyve warning CTASSERT

[Conrad Meyer]

Better to just replace CTASSERT() with _Static_assert() while you're here.

Best,
Conrad

On Thu, Aug 13, 2015 at 5:05 AM, Stefano Garzarella
<stefanogarzarella at gmail.com> wrote:
> Hi all,
> when I compile bhyve, I have the following errors from clang:
> pci_emul.c:750:2: error: unused typedef '__assert750'
> [-Werror,-Wunused-local-typedef]
>         CTASSERT(sizeof(struct msicap) == 14);
> pci_emul.c:776:2: error: unused typedef '__assert776'
> [-Werror,-Wunused-local-typedef]
>         CTASSERT(sizeof(struct msixcap) == 12);
> pci_emul.c:928:2: error: unused typedef '__assert928'
> [-Werror,-Wunused-local-typedef]
>         CTASSERT(sizeof(struct pciecap) == 60);
>
> I fixed them in this simple way:
>
> diff --git a/bhyverun.h b/bhyverun.h
> index 87824ef..7ac3aa9 100644
> --- a/bhyverun.h
> +++ b/bhyverun.h
> @@ -32,7 +32,8 @@
>  #ifndef CTASSERT               /* Allow lint to override */
>  #define        CTASSERT(x)             _CTASSERT(x, __LINE__)
>  #define        _CTASSERT(x, y)         __CTASSERT(x, y)
> -#define        __CTASSERT(x, y)        typedef char __assert ## y[(x) ? 1
> : -1]
> +#define        __CTASSERT(x, y)        typedef char __assert ## y[(x) ? 1
> : -1] \
> +                                                           __unused
>  #endif
>
> Cheers,
> Stefano
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