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From 229fc129be85a4d2d2c4efddae7bb97c3d87d416 Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Mon, 13 Mar 2023 22:02:01 -0700
Subject: [PATCH] examples: fix Arm build with GCC 12
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: 732115ce38c6 ("examples/l3fwd: move packet group function in common")
Upstream-Status: Backport [https://github.com/DPDK/dpdk/commit/b269bd630e96b276a69d698e13ad9ebfbbb67512]
Signed-off-by: Amit Prakash Shukla <amitprakashs@marvell.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
examples/l3fwd/l3fwd_neon.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/examples/l3fwd/l3fwd_neon.h b/examples/l3fwd/l3fwd_neon.h
index 86ac5971d7..dc73e9fef7 100644
--- a/examples/l3fwd/l3fwd_neon.h
+++ b/examples/l3fwd/l3fwd_neon.h
@@ -77,7 +77,7 @@ 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;
+ } __rte_packed *pnum = (void *)pn;
int32_t v;
uint16x8_t mask = {1, 2, 4, 8, 0, 0, 0, 0};
--
2.39.2
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