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From: Jonathan Wakely <jwakely.gcc@gmail.com>
Date: Sat, 10 Oct 2020 21:09:30 +0100
Message-ID: <CAH6eHdT_vEtxbihKOWQoBcPMDj96My9L6zwCSO51zqWNgiegbg@mail.gmail.com>
Subject: Re: Atomic accesses on ARM microcontrollers
To: David Brown <david.brown@hesbynett.no>
Cc: Toby Douglass <toby@winterflaw.net>, GCC help <gcc-help@gcc.gnu.org>
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On Sat, 10 Oct 2020 at 20:47, David Brown <david.brown@hesbynett.no> wrote:
> On 09/10/2020 23:35, Toby Douglass wrote:
> > The 4.1.2 atomics or the later, replacement API?
> >
>
> I am not sure what you mean here, or what "4.1.2" refers to - it doesn't
> match either the gcc manual or the C standards as far as I can see.

I assume this means GCC 4.1.2 which was the first to support the
__sync built-ins
<https://gcc.gnu.org/onlinedocs/gcc/_005f_005fsync-Builtins.html>,
which were superseded by the __atomic ones
<https://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html>