Article View: comp.std.c
Article #2526Re: Want the word on __STDC__
From: Rahul Dhesi
Date: Thu, 07 Mar 1991 02:23
Date: Thu, 07 Mar 1991 02:23
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1592 bytes
In <668288453.3046@mindcraft.com> fred@mindcraft.com (Fred Zlotnick) recommends the test > #if __STDC__ == 1 to detect nonconforming implementations. Unfortunately there are two problems with this. First, it is quite possible that a future ANSI C standard will bump up the value of __STDC__ to 2, thus breaking code that assumes that (__STDC__ != 1) implies (not standard C). Second, some existing nonconforming implementations of C will fail to compile expressions like #if something == something. Now you may say these implementations aren't C, and you might be right, but they are *called* C by many users, and they will be upset that ostensibly portable C code won't compile. Truly defensive programmers assume that the preprocessor does not understand C expressions. Such flaky implementations are fortunately dying out, but I could easily ruffle through my old disks and find a few that aren't quite dead yet. -- Rahul Dhesi <dhesi%cirrusl@oliveb.ATC.olivetti.com> UUCP: oliveb!cirrusl!dhesi
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!mips!spool.mu.edu!sdd.hp.com!zaphod.mps.ohio-state.edu!samsung!olivea!tymix!cirrusl!ss168!dhesi From: dhesi%cirrusl@oliveb.ATC.olivetti.com (Rahul Dhesi) Newsgroups: comp.std.c Subject: Re: Want the word on __STDC__ Message-ID: <2986@cirrusl.UUCP> Date: 7 Mar 91 02:23:33 GMT References: <4755@lib.tmc.edu> <15260@smoke.brl.mil> <4203@lupine.NCD.COM> <15381@smoke.brl.mil> <668288453.3046@mindcraft.com> Sender: news@cirrusl.UUCP Organization: Cirrus Logic Inc. Lines: 26