Horton

Re: Trying out <stdatomic.h>

Peter Eisentraut <peter@eisentraut.org>

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From: Peter Eisentraut <peter@eisentraut.org>
To: Thomas Munro <thomas.munro@gmail.com>, Heikki Linnakangas <hlinnaka@iki.fi>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2025-11-19T11:23:25Z
Lists: pgsql-hackers

Commits

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  1. Add some missing #include <limits.h>.

  2. Enable MSVC conforming preprocessor

On 13.11.25 12:35, Thomas Munro wrote:
> It passes with VS 2022 on CI.  I had to skip some assertions about
> macros promising lock-free implementation, that it doesn't define in C
> mode yet.  They are definitely lock-free though[1], and the macros are
> defined for C++, and the same under the covers...  Perhaps
> feature/conformance macros won't be defined until a few remaining
> pieces (things we don't care about) are accessible from C?  (I see
> that Visual Studio 2026 has also just shipped a couple of days ago,
> not investigated.)

Note also that we still have buildfarm members with gcc <4.9, which is 
required for stdatomic.h/_Atomic there.

We could most likely resolve to get rid of them when the time comes, but 
let's not forget to plan that.