[PATCH] event/dlb2: fix meson build

[Ferruh Yigit]

On 11/3/2022 3:35 PM, Thomas Monjalon wrote:
> 03/11/2022 16:22, Ferruh Yigit:
>> "meson setup" fails when '-Werror' compiler flag is enabled [1].
>> This is not a build error in the driver but a build error in meson
>> during "meson setup" stage.
>>
>> This issue exists for a while but meson takes it as a warning and
>> ignores it unless '-Werror' compiler flag is provided.
> [...]
>> Reproduced via `meson -Dc_args='-Werror' build`
> 
> Is it different of 'meson --werror" as in devtools/test-meson-builds.sh
> or 'meson -Dwerror=true' as in .ci/linux-build.sh?
> 

As I checked now, it seems there is a difference.

Via "meson --werror" & "meson -Dwerror=true",
'-Werror' flag is used to compile dpdk source code, but meson doesn't 
use the flag for its internal logic, so this seems more proper usage.

Via "meson -Dc_args='-Werror'" & "CFLAGS='-Werror' meson" usage,
'-Werror' flag is used both to compile dpdk code and meson internal 
logic, so that is why this usage cause build error.


And independent from the above usage difference, event/dlb2 meson file 
is wrong and this fix is required.
I assume 'dlb2_avx512.c' compiled because of the '-mavx512vl' fallback 
and that is why mentioned error is not detected.