From: Jonathan Wakely <jwakely.gcc@gmail.com>
To: Gavin Ray <ray.gavin97@gmail.com>
Cc: Joseph Myers <joseph@codesourcery.com>,
"gcc@gcc.gnu.org" <gcc@gcc.gnu.org>
Subject: Re: Using [[may_alias]] in C23/C++23 on a union works in neither post-"union" position, or at the end of the definition
Date: Tue, 6 Dec 2022 20:36:46 +0000 [thread overview]
Message-ID: <CAH6eHdRukNcPpYudPGq19XXZQfg7W0-n-V_i9fctVxKnU+uMHg@mail.gmail.com> (raw)
In-Reply-To: <CAFtvWZMxmeeZY8QpODgTQmvBRAR62hDaqwN6D2XCvnY8JmFikw@mail.gmail.com>
On Tue, 6 Dec 2022 at 20:32, Gavin Ray wrote:
>
> Ah got it, didn't know that (handy, will save me duplicating a bunch of attributes).
> Thanks Jonathan!
The Clang doc acually show all the forms that can be used for each attribute:
https://clang.llvm.org/docs/AttributeReference.html#may-alias
"GNU" means __attribute__((may_alias)) and the C++11 and C2x columns
show that [[gnu::may_alias]] is the right way to use it.
Clang-specific attributes use clang:: instead e.g.
https://clang.llvm.org/docs/AttributeReference.html#preserve-all
prev parent reply other threads:[~2022-12-06 20:37 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-06 3:17 Gavin Ray
2022-12-06 16:54 ` Joseph Myers
2022-12-06 18:35 ` Gavin Ray
2022-12-06 19:23 ` Jonathan Wakely
2022-12-06 20:31 ` Gavin Ray
2022-12-06 20:36 ` Jonathan Wakely [this message]
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