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From: dhesi%cirrusl@oliveb.ATC.olivetti.com (Rahul Dhesi)
Newsgroups: comp.lang.c
Subject: Re: Do you use stdarg, varargs or ya-args?
Message-ID: <3123@cirrusl.UUCP>
Date: 10 May 91 16:17:56 GMT
References: <2755@muffin.cme.nist.gov> <13041@dog.ee.lbl.gov>
Sender: news@cirrusl.UUCP
Reply-To: Rahul Dhesi <dhesi@cirrus.COM>
Lines: 18

In <13041@dog.ee.lbl.gov> torek@elf.ee.lbl.gov (Chris Torek) defines
this convenience macro:

     #if __STDC__
     #define VASTART(ap, last) va_start(ap, last)
     #else
     #define VASTART(ap, last) va_start(ap)
     #endif

I would like to know if there is anything in the ANSI C standard that
guarantees that this will work.  Using the Metaware High C compiler
(which I mention in another posting), I found that it didn't.  The High
C compiler was doing some fancy token-pasting in its va_start macro,
and that token pasting didn't work right if I defined my own macro that
invoked va_start.  It caused me three days of pain.
--
Rahul Dhesi <dhesi@cirrus.COM>
UUCP:  oliveb!cirrusl!dhesi