Article View: comp.bugs.4bsd
Article #526Re: C preprocessor question
From: tps
Date: Thu, 29 Jan 1987 05:40
Date: Thu, 29 Jan 1987 05:40
22 lines
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1319 bytes
In article <818@wjvax.wjvax.UUCP> brett@wjvax.UUCP (Brett Galloway) writes: >I have a question about the C preprocessor. I have the following code >fragment, which fails to compile on my system (4.2BSD): > >#define GROUP(group,subgroup) (((group) << 8) | (subgroup)) > >#if GROUP(0,0) >#endif > >The #if chokes for some reason. Can anyone in comp.lang.c see my error? >If there is no error, is this a known bug of the 4.2BSD cpp? >Brett Galloway I have replicated your reported behavior on our 4.3BSD system. Sure looks like a bug to me. The surprising thing is that it goes away if you just replace GROUP by hand. That is, #if (((0) << 8) | (0)) #endif works fine. || Tom Stockfisch, UCSD Chemistry tps%chem@sdcsvax.UCSD
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!cbatt!ucbvax!sdcsvax!sdchem!tps From: tps@sdchem.UUCP Newsgroups: comp.bugs.4bsd Subject: Re: C preprocessor question Message-ID: <625@sdchema.sdchem.UUCP> Date: Thu, 29-Jan-87 00:40:27 EST Article-I.D.: sdchema.625 Posted: Thu Jan 29 00:40:27 1987 Date-Received: Fri, 30-Jan-87 01:46:43 EST References: <818@wjvax.wjvax.UUCP> Sender: news@sdchem.UUCP Reply-To: tps@sdchemf.UUCP (Tom Stockfisch) Organization: UC San Diego Lines: 22 Keywords: preprocessor, UNIX, BSD