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Date: Mon, 27 Apr 2009 18:01:57 -0600
From: Eric Blake <ebb9 AT byu DOT net>
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To: cygwin AT cygwin DOT com, config-patches AT gnu DOT org
Subject: Re: Update config.guess to treat cygwin 1.7 as new system name
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According to Christopher Faylor on 4/27/2009 10:02 AM:
>> That would be fine with me.  Properly written scripts already use cygwin*
>> as the case for detecting cygwin in general.
> 
> I don't see any benefits to appending the cygwin version number to the
> triplet.  That just makes extra typing.  So what if there is new
> functionality?  That's what configure is supposed to determine.

But there's some things that configure scripts cannot determine without
guessing (namely, any runtime test in a cross-compilation environment).
But there are a number of places that exist where the current
cross-compilation guess is pessimistic because of cygwin 1.5 deficiencies,
where distinguishing from cygwin 1.7 can only be done by uname and/or
config.guess.

Reread my original mail from February, when I first suggested this, and
pointed to such an example:
http://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=blob;f=m4/printf.m4;h=4207ace;hb=f7beddb

> 
> What other systems emit version numbers after the OS name?  Certainly
> config.guess for linux doesn't do that and it could have done that given
> the improvements from 2.2 -> 2.4 -> 2.6.

Solaris 6 through 11.  MacOS.  etc.  There's definitely precedence in
config.guess for including OS version number in the config.guess output.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9 AT byu DOT net
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