Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!apple!sun-barr!cs.utexas.edu!uunet!mcsun!unido!tub!uwbln!ckl
From: ckl@uwbln.UUCP (Christoph Kuenkel)
Newsgroups: comp.lang.c
Subject: Re: quotes inside #if 0
Keywords: ANSI, comments
Message-ID: <1809@uwbull.uwbln.UUCP>
Date: 11 Sep 89 08:28:15 GMT
References: <2014@munnari.oz.au> <10935@smoke.BRL.MIL> <3626@yunexus.UUCP> <32905@ism780c.isc.com>
Sender: ckl@uwbln.UUCP
Distribution: comp
Organization: UniWare GmbH, Berlin
Lines: 22

In article <32905@ism780c.isc.com>, news@ism780c.isc.com (News system) writes:

> PS: I have heard that Unix release 5.4 uses two compilers.  One to compile
> Unix and one (ANSII) for new programs.  Does any one know if this is true?

It seems to be one compiler that supports three modes:

 - transitional mode (supports ``full ansi'', accepts any k&r source, uses
   k&r semantics, warns if semantics differ)
 - ansi mode (supports ``full ansi'', uses ansi semantics, warns if
   semantics differ)
 - ansi conforming mode (supports ``full ansi'', uses ansi semantics, warns if
   semantics differ, no non ansi names in namespace)

modes are switched to with compiler flag (-X{t,a,c}).  this information is
from the at&t/sun software developer conference.

christoph