| From: | "Zidenberg, Tsahi" <tsahee(at)amazon(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [PATCH] audo-detect and use -moutline-atomics compilation flag for aarch64 |
| Date: | 2020-09-10 06:37:37 |
| Message-ID: | 8B2C1554-0A0D-4242-B5D2-8E579303BEF1@amazon.com |
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| Lists: | pgsql-hackers |
On 08/09/2020, 1:01, "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> I wonder what version of gcc you intend this for. AFAICS, older
> gcc versions lack this flag at all, while newer ones have it on
> by default.
(previously sent private reply, sorry)
The moutline-atomics flag showed substantial enough improvements
that it has been backported to GCC 9, 8 and there is a gcc-7 branch in
the works.
Ubuntu has integrated this in 20.04, Amazon Linux 2 supports it,
with other distributions including Ubuntu 18.04 and Debian on the way.
all distributions, including the upcoming Ubuntu with GCC-10, have
moutline-atomics turned off by default.
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