Re: Defend against -ffast-math in meson builds

Hi,

On Wed, Mar 11, 2026 at 11:19:45AM -0400, Tom Lane wrote:
> Peter Eisentraut <peter(at)eisentraut(dot)org> writes:
> > The existing check in configure is because certain Linux distributions
> > used to compile everything with -ffast-math to be "faster", and that
> > kept breaking PostgreSQL and so we wanted to stop them very early.
> > These are gone, and the defenses in the code like date.c should be
> > sufficient for any new attempts. I think we could remove the check in
> > configure.
>
> The defenses in those modules are probably obsolete too: aren't they about
> ensuring exact results with floating-point timestamps? My gut reaction to
> this was maybe we could remove *all* of that, so now I'm curious what
> problem Bertrand ran into.

I got some regression tests failing: [1].

[1]: https://postgr.es/m/abGO%2BBl1FQlpvFAt%40ip-10-97-1-34.eu-west-3.compute.internal

Regards,

--
Bertrand Drouvot
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com