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net: if: Add dummy member to anonymous union in net_if_addr

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When both CONFIG_NET_IPV6_DAD and CONFIG_NET_IPV4_ACD are disabled, the
anonymous union in struct net_if_addr ends up with no members, which
results in a different struct layout between C and C++.

In C, an empty union has size 0, while in C++ it has size >=1, which
shifts the offsets of the following fields.

Add a 1-byte dummy member to the union to ensure consistent layout
across both compilers.

Signed-off-by: Adrian Gielniewski <adrian.gielniewski@nordicsemi.no>
This commit is contained in:
Adrian Gielniewski 2025-05-22 22:46:43 +02:00 • committed by Benjamin Cabé
commit 4d8ffcca93
1 changed files with 1 additions and 0 deletions
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include/zephyr/net/net_if.h
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@ -125,6 +125,7 @@ struct net_if_addr {
uint8_t acd_state;
};
#endif /* CONFIG_NET_IPV4_ACD */
uint8_t _dummy;
};
#if defined(CONFIG_NET_IPV6_DAD) || defined(CONFIG_NET_IPV4_ACD)