[PATCH] app/testpmd: fix build without drivers

[Bruce Richardson]

On Fri, Feb 25, 2022 at 04:26:53PM +0100, Thomas Monjalon wrote:
> When ixgbe and bnxt are disabled, compilation was failing:
> 
> app/test-pmd/cmdline.c:9396:11: error:
> 	variable 'vf_rxmode' set but not used
> 
> Fixes: 4cfe399f6550 ("net/bnxt: support to set VF rxmode")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Thomas Monjalon <thomas at monjalon.net>
> ---
>  app/test-pmd/cmdline.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c
> index b4ba8da2b0..7ab0575e64 100644
> --- a/app/test-pmd/cmdline.c
> +++ b/app/test-pmd/cmdline.c
> @@ -9409,6 +9409,7 @@ cmd_set_vf_rxmode_parsed(void *parsed_result,
>  	}
>  
>  	RTE_SET_USED(is_on);
> +	RTE_SET_USED(vf_rxmode);
>  
Checking the code, I see the issue and the fix looks correct. However,
doing some basic builds disabling the relevant drivers, and all drivers, in
fact, I fail to reproduce the actual error message. Does this error only
occur at lower optimization levels, or only using clang or similar?

Acked-by: Bruce Richardson <bruce.richardson at intel.com>