From: Eric Wong <e@80x24.org>
Date: Tue, 21 Mar 2017 01:59:48 GMT
Subject: Re: Safe to use stdatomic.h?
Message-ID: <20170321015948.GC6536@starla>
In-Reply-To: <20170320232240.k3egololfj7wt5cf@genre.crustytoothpaste.net>

"brian m. carlson" <sandals@crustytoothpaste.net> wrote:
> I could support the argument for ditching RHEL/CentOS 5 support, but I
> expect other people might disagree.  After all, we're still targeting
> C89.

Yeah, I still use and support CentOS 5 in some places (but maybe
not git, still using ancient versions there, too).

Anyways, I'm still relying on the traditional __sync_* builtins
from in earlier gcc 4.x releases in some code GPL-3.0 code I
maintain for older systems:

	https://gcc.gnu.org/onlinedocs/gcc/_005f_005fsync-Builtins.html

Since git is GPL-2.0, it is license-compatible with all the
atomic macros in the Linux kernel, as well as the kernel-derived
userspace atomics (uatomic) found in liburcu <http://liburcu.org/>