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From: wcs@ho95e.UUCP
Newsgroups: comp.lang.c
Subject: Re: _sys_* etc.
Message-ID: <1270@ho95e.UUCP>
Date: Mon, 19-Jan-87 00:42:40 EST
Article-I.D.: ho95e.1270
Posted: Mon Jan 19 00:42:40 1987
Date-Received: Tue, 20-Jan-87 03:54:52 EST
References: <2144@brl-adm.ARPA> <5497@brl-smoke.ARPA> <1258@ho95e.UUCP> <5513@brl-smoke.ARPA>
Reply-To: wcs@ho95e.UUCP (Bill Stewart 1-201-949-0705 ihnp4!ho95c!wcs HO 2G202)
Organization: AT&T Bell Labs, Holmdel NJ
Lines: 20
Keywords: oops

In article <5513@brl-smoke.ARPA> gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>) writes:
>In article <1258@ho95e.UUCP> wcs@ho95e.UUCP (Bill Stewart 1-201-949-0705 ihnp4!ho95c!wcs HO 2G202) writes:
>>... why not let
>>_sys_ and _machine_ be preprocessor variables, leading to
>>	#define	_sys_	SysVR2
>>	#define	_machine_	u3b2
>>and
>>	#if _machine_ = vax
>
>Because the last line has no meaning unless the symbol `vax' is
>also macro defined to something like an integer constant (further, all
>possible system symbols would have to be assigned different constant
>values).  (The `=' is not a string compare as in Bourne shell scripts.)
>
>Nice try, though.

Oh, well, it looked good.  As you point out (and Larry Rosler did by mail),
= is comparing integers, not strings.  Back to suggestions of _mach_vax.
-- 
# Bill Stewart, AT&T Bell Labs 2G-202, Holmdel NJ 1-201-949-0705 ihnp4!ho95c!wcs