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From: Amit Prakash Shukla <amitprakashs@marvell.com>
To: Ruifeng Wang <ruifeng.wang@arm.com>
CC: <dev@dpdk.org>, <jerinj@marvell.com>, <stable@dpdk.org>,
<gakhil@marvell.com>, Amit Prakash Shukla <amitprakashs@marvell.com>
Subject: [PATCH] examples: compilation fix for GCC-12
Date: Thu, 1 Sep 2022 13:53:43 +0530
Message-ID: <20220901082343.3074804-1-amitprakashs@marvell.com>
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GCC-12 warns when a pointer of type union points to an array of same
defined size, as union internally gets paded with pad bytes.
../examples/common/neon/port_group.h:42:21: error: array subscript
'union <anonymous>[0]' is partly outside array bounds of
'uint16_t[5]' {aka 'short unsigned int[5]'}
[-Werror=array-bounds]
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]' {aka 'short unsigned int[5]'} [-Werror=array-bounds]
43 | pnum->u16[FWDSTEP] = 1;
| ^~
Fixes: bdfc3816fbfc ("examples: common packet group functionality")
Cc: stable@dpdk.org
Signed-off-by: Amit Prakash Shukla <amitprakashs@marvell.com>
---
examples/common/neon/port_group.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/examples/common/neon/port_group.h b/examples/common/neon/port_group.h
index 82c6ed6d73..97da604583 100644
--- a/examples/common/neon/port_group.h
+++ b/examples/common/neon/port_group.h
@@ -24,7 +24,7 @@ port_groupx4(uint16_t pn[FWDSTEP + 1], uint16_t *lp, uint16x8_t dp1,
union {
uint16_t u16[FWDSTEP + 1];
uint64_t u64;
- } *pnum = (void *)pn;
+ } __attribute__((__packed__)) *pnum = (void *)pn;
uint16x8_t mask = {1, 2, 4, 8, 0, 0, 0, 0};
int32_t v;
--
2.25.1