From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Thu,  6 Apr 1995 01:42:03 -0400
From: Greg Hudson ghudson@MIT.EDU
Subject: plan 9 and linux
Topicbox-Message-UUID: 0aedbf5e-eac8-11e9-9e20-41e7f4b1d025
Message-ID: <19950406054203.x3UEsGC5EbGUYCfrzhkJmXRL0Od0G2ThVwp1YtmYYAs@z>


Rob Pike wrote:
> I may be wrong, but every other system I can think of is built for
> one system and then ported to another; with Plan 9, the system is
> carried along together for all architectures, compiled from one
> source tree, etc.

BSD 4.4 (and, more practically, NetBSD) has the same properties--a
single source tree which compiles for seven or so different platforms.
There are still pieces that need to be made more architecture-
independent (e.g. the console driver), butbut it's still one system that
runs on a variety of different architectures.  I'm afraid Xwindows
won't compile for BSD 4.4 in four seconds, though.

Just a note.  There may be Mach-based operating systems with this
property as well, depending on your definitions.