From: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Noah Misch <noah@leadboat.com>
Cc: Andrew Dunstan <andrew@dunslane.net>
Cc: pgsql-hackers@postgresql.org
Subject: Re: PL_stashcache, or, what's our minimum Perl version?
Date: Mon, 31 Jul 2017 15:37:25 -0400
Message-ID: <1232c099-92fa-beb5-1b4c-5f9d73886c99@2ndquadrant.com> (raw)
In-Reply-To: <90a92a7d-938e-507a-3bd7-ecd2b4004689@2ndquadrant.com>
References: <20540.1501210115@sss.pgh.pa.us>
<16894.1501392088@sss.pgh.pa.us>
<20170730154814.GA2636941@rfd.leadboat.com>
<22744.1501430710@sss.pgh.pa.us>
<20170730163054.GA2630977@rfd.leadboat.com>
<25937.1501433410@sss.pgh.pa.us>
<c3ad3515-64e9-f5a1-1f39-d2cb646fcb96@2ndquadrant.com>
<9072.1501527316@sss.pgh.pa.us>
<90a92a7d-938e-507a-3bd7-ecd2b4004689@2ndquadrant.com>
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On 7/31/17 15:17, Peter Eisentraut wrote:
> On 7/31/17 14:55, Tom Lane wrote:
>>> We use the "PATH" variants when we need a fully qualified name. For
>>> example, at some point or another, we needed to substitute a fully
>>> qualified perl binary name into the headers of scripts.
>>
>>> If there is no such requirement, then we should use the non-PATH variants.
>>
>> Why? That risks failures of various sorts, and you have not stated
>> any actual benefit of it.
>
> What I wrote is merely a description of the current practice. That
> practice was in turn developed out of ancient Autoconf standard
> practices. There are arguments to be made for doing it differently.
>
> One major PITA with the AC_PATH_* checks is that you can only override
> them with environment variables that are full paths; otherwise the
> environment variables are ignored. For example, currently, running
>
> ./configure PYTHON=python3
>
> will result in the PYTHON setting being ignored. Currently, this only
> affects a small number of variables, but if we expanded that, it would
> be a pretty significant usability change.
Plus certain special macros such as AC_PROG_CC don't have a PATH
variant, so you're always going to have some inconsistencies.
--
Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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To: pgsql-hackers@postgresql.org
Cc: peter.eisentraut@2ndquadrant.com, tgl@sss.pgh.pa.us, noah@leadboat.com, andrew@dunslane.net
Subject: Re: PL_stashcache, or, what's our minimum Perl version?
In-Reply-To: <1232c099-92fa-beb5-1b4c-5f9d73886c99@2ndquadrant.com>
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