[EXT] DPDK build for Arm with GCC 12

[Rahul Bhansali]

Hi Thomas,

> -----Original Message-----
> From: Thomas Monjalon <thomas at monjalon.net>
> Sent: Tuesday, October 4, 2022 6:17 PM
> To: Rahul Bhansali <rbhansali at marvell.com>; Akhil Goyal
> <gakhil at marvell.com>
> Cc: dev at dpdk.org; ruifeng.wang at arm.com; honnappa.nagarahalli at arm.com
> Subject: [EXT] DPDK build for Arm with GCC 12
> 
> External Email
> 
> ----------------------------------------------------------------------
> Hello,
> 
> GCC 12 suspects an out-of-bound write in NEON port_groupx4():
> 
> In file included from examples/ipsec-secgw/ipsec_neon.h:9,
>                  from examples/ipsec-secgw/ipsec_lpm_neon.h:9,
>                  from examples/ipsec-secgw/ipsec_worker.c:16:
> examples/common/neon/port_group.h: In function 'port_groupx4':
> examples/common/neon/port_group.h:42:21: error:
> 	array subscript 'union <anonymous>[0]' is partly outside
> 	array bounds of 'uint16_t[5]'
>    42 |                 pnum->u64 = gptbl[v].pnum;
>       |                     ^~
> examples/common/neon/port_group.h:21:23: note:
> 	object 'pn' of size [0, 10]
>    21 | port_groupx4(uint16_t pn[FWDSTEP + 1], uint16_t *lp, uint16x8_t dp1,
>       |              ~~~~~~~~~^~~~~~~~~~~~~~~
> examples/common/neon/port_group.h:43:21: error:
> 	array subscript 'union <anonymous>[0]' is partly outside
> 	array bounds of 'uint16_t[5]'
>    43 |                 pnum->u16[FWDSTEP] = 1;
>       |                     ^~
> examples/common/neon/port_group.h:21:23: note:
> 	object 'pn' of size [0, 10]
>    21 | port_groupx4(uint16_t pn[FWDSTEP + 1], uint16_t *lp, uint16x8_t dp1,
>       |              ~~~~~~~~~^~~~~~~~~~~~~~~
> 
> Please could you help fixing it?
This is already addressed in http://patches.dpdk.org/project/dpdk/patch/20220902074337.3129786-1-amitprakashs@marvell.com/ by @Amit Prakash Shukla .

>