linux-kernel - Re: [PATCH net-next] net: uapi: Provide an UAPI definition of 'struct sockaddr'

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Message-ID: <lhutswrj73u.fsf@oldenburg.str.redhat.com>
Date: Mon, 12 Jan 2026 14:25:25 +0100
From: Florian Weimer <fweimer@...hat.com>
To: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Cc: Arnd Bergmann <arnd@...db.de>,  Jakub Kicinski <kuba@...nel.org>,  Eric
 Dumazet <edumazet@...gle.com>,  Kuniyuki Iwashima <kuniyu@...gle.com>,
  Paolo Abeni <pabeni@...hat.com>,  Willem de Bruijn <willemb@...gle.com>,
  Netdev <netdev@...r.kernel.org>,  linux-kernel@...r.kernel.org,
  linux-api@...r.kernel.org
Subject: Re: [PATCH net-next] net: uapi: Provide an UAPI definition of
 'struct sockaddr'

* Thomas Weißschuh:

>> If you call the data member sa_data just like glibc, it will only fail
>> in C++, not C.  GCC considers the two definitions sufficiently
>> equivalent (even though glibc adds a may_alias attribute to meet POSIX
>> requirements), and duplicate definitions are permitted in C.
>
> clang is not so lenient and will error out.

It seems it accepts it if you switch to C23 mode.

Thanks,
Florian