Re: [Xen-devel] [PATCH] tools/kdd: use mute -Warray-bounds only on new gcc version

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Apr 06, 2018 at 05:32:57PM +0200, Marek Marczykowski-Górecki wrote:
> "#pragma GCC diagnostic push" is supported only on gcc >= 4.6. But since
> muting this the warning is needed only on gcc >= 8, do it only then,
> instead of tricking the compiler about this code (and making it less
> readable to the human too).
> 
> This fixes 5888eecca0 "tools/kdd: mute spurious gcc warning".
> 
> Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
> ---
>  tools/debugger/kdd/kdd.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/tools/debugger/kdd/kdd.c b/tools/debugger/kdd/kdd.c
> index 61d769ece9..95c3a949ec 100644
> --- a/tools/debugger/kdd/kdd.c
> +++ b/tools/debugger/kdd/kdd.c
> @@ -695,10 +695,14 @@ static void kdd_handle_read_ctrl(kdd_state *s)
>              KDD_LOG(s, "Request outside of known control space\n");
>              len = 0;
>          } else {
> +#if __GNUC__ >= 8
>  #pragma GCC diagnostic push
>  #pragma GCC diagnostic ignored "-Warray-bounds"
> +#endif
>              memcpy(buf, ((uint8_t *)&ctrl.c32) + offset, len);
> +#if __GNUC__ >= 8
>  #pragma GCC diagnostic pop
> +#endif

Oh thanks for the quick turnaround.

Since Tim thinks it is better to not disable the warning -- how about
using assert() to give the compiler a hint? Would that work?

There is no need to rush for the deadline, I think the fix to this can
be committed any time.

Wei.

>          }
>      }
>  
> -- 
> 2.13.6
> 

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