From: Andrew Dunstan <andrew.dunstan@2ndquadrant.com>
Subject: Re: pgsql: Add support for hyperbolic functions, as well as log10().
To: Tom Lane <tgl@sss.pgh.pa.us>, Dean Rasheed <dean.a.rasheed@gmail.com>
Cc: Michael Paquier <michael@paquier.xyz>,
 PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>,
 laetitia.avrot@gmail.com
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Message-ID: <9aae40da-9572-a82b-a283-d2158ed6ab0c@2ndQuadrant.com>
Date: Thu, 14 Mar 2019 08:54:49 -0400
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On 3/14/19 12:41 AM, Tom Lane wrote:
> Dean Rasheed <dean.a.rasheed@gmail.com> writes:
>> I'm amazed that jacana's asinh() returned -0 for an input of +0.
> Even more amusingly, it returns NaN for acosh('infinity'), cf
> https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=jacana&dt=2019-03-14%2003%3A00%3A34
>
> Presumably that means they calculated "infinity - infinity" at some
> point, but why?
>
> So far, no other failures ...
>
> 			


I have replicated this on my Msys2 test system.


I assume it's a bug in the mingw math library. I think jacana is the
only currently reporting mingw member :-( The MSVC members appear to be
happy.


I have several releases of the mingw64 toolsets installed on jacana -
I'll try an earlier version to see if it makes a difference.


cheers


andrew


-- 

Andrew Dunstan                https://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services