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From: barrett@jhunix.HCF.JHU.EDU (Dan Barrett)
Newsgroups: comp.lang.c
Subject: Preprocessor question (is gcc standard)?
Message-ID: <7654@jhunix.HCF.JHU.EDU>
Date: 26 Feb 91 22:53:45 GMT
Distribution: usa
Organization: The Johns Hopkins University - HCF
Lines: 28


	GCC's preprocessor doesn't like this code:

		#include <ctype.h>
		#define ARGS		(x)

		main()
		{
			...	isalpha ARGS ...
		}

The linker complains that _isalpha is not known.  According to H&S and K&R,
you are allowed whitespace between the name of a macro and its argument list
in the invocation.

	GCC's documentation says that a macro invocation that is not
followed by a left parenthesis (ignoring whitespace) is not considered a
macro invocation.  That explains why GCC doesn't like the above program.
But is this the standard way an ANSI preprocessor should work?  I can see
advantages and disadvantages to this behavior.

                                                        Dan

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