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From: gwyn@smoke.brl.mil (Doug Gwyn)
Newsgroups: comp.lang.c
Subject: Re: Macro expansions by 2 different C preprocessors
Message-ID: <15778@smoke.brl.mil>
Date: 10 Apr 91 04:29:33 GMT
References: <acOn01ls55Ex00@amdahl.uts.amdahl.com>
Organization: U.S. Army Ballistic Research Laboratory, APG, MD.
Lines: 12

In article <acOn01ls55Ex00@amdahl.uts.amdahl.com> tej@amdahl.uts.amdahl.com (Tejkumar Arora) writes:
>compiler A: fails to compile. gets stuck at the field major in struct foo.
>	    thinks it is a macro and complains of missing argument.

That is the behavior of a Reiser CPP, one of many bugs it has.

>compiler B: compiles successfully. determines from context & usage that the
>	    field major is not a macro....

That is what a standard conforming compiler must do (the only relevant
context is whether or not the next preprocessing token after the identifier
is a left parenthesis).