cygwin detection

[Eric Blake]

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According to Kenneth Nellis on 9/29/2006 7:50 AM:
> Couldn't find anything relevant in the archives or the documentation...
> 
> I have bash scripts that I want to run identically under Cygwin and 
> Linux, which sometimes require the scripts to detect the environment 
> and branch accordingly. There are numerous ways to do Cygwin detection, 
> but I was wondering what technique should work with the widest audience 
> and be most immune to future Cygwin developments.

Autoconf uses the config.guess script as its means to detect what platform
it is on.  This uses uname(1) and other tricks under the hood.  I would
recommend just using this script, since it is well maintained.

- --
Life is short - so eat dessert first!

Eric Blake             ebb9@byu.net
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