From: Tom Lane <tgl@sss.pgh.pa.us>
To: Craig Ringer <craig@2ndquadrant.com>
cc: Euler Taveira <euler@timbira.com.br>,
 YUriy Zhuravlev <u.zhuravlev@postgrespro.ru>,
 PostgreSQL Hackers <pgsql-hackers@postgresql.org>,
 =?UTF-8?B?RGV2cmltIEfDvG5kw7x6?= <devrim@gunduz.org>
Subject: Re: WIP: About CMake v2
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Comments: In-reply-to Craig Ringer <craig@2ndquadrant.com>
 message dated "Fri, 27 Nov 2015 13:50:20 +0800"
Date: Fri, 27 Nov 2015 01:14:18 -0500
Message-ID: <29413.1448604858@sss.pgh.pa.us>
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Craig Ringer <craig@2ndquadrant.com> writes:
> One thing to consider: I can't imagine backporting this to all supported
> back branches, it'd be a switch for the next release. Right?

Agreed.

> That means he doesn't have to worry about what RH / Debian policy for their
> old versions is. RH isn't going to release PostgreSQL 9.7 or whatever for
> RHEL6, Debian isn't going to release it for Wheezy, etc.

Well, they won't if we make it impossible for them to do so.

More generally, I do not buy this argument for one second as a reason why
we can demand latest-and-greatest cmake, rather than something that's
likely to be readily available on a wide variety of platforms.  Devrim is
not the only person in the world who will be needing to build PG on RHEL6,
or even older platforms.

If you take a close look at our build requirements, you will notice a
general distaste for insisting on latest anything.  cmake is not going
to escape that project bias.  Do you really think a project that still
works with C89, Perl 5.8.something, Python 2.3, bison 1.875, yadda yadda
is readily going to accept a patch that requires this year's cmake?
It would take a fairly impressive technical argument why working with
older cmakes is impossible/impractical before that will happen.

			regards, tom lane


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