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From: gwyn@smoke.BRL.MIL (Doug Gwyn)
Newsgroups: comp.std.c
Subject: Re: setjmp as macro
Message-ID: <13667@smoke.BRL.MIL>
Date: 28 Aug 90 01:22:10 GMT
References: <12516@paperboy.OSF.ORG>
Organization: U.S. Army Ballistic Research Laboratory, APG, MD.
Lines: 10

In article <12516@paperboy.OSF.ORG> rabin@osf.org (Paul Rabin) writes:
>	Does ANSI C require that a macro implementation of setjmp
>	evaluate its arguments exactly once?  If so, do you have a
>	suggestion for handling the jmp_buf argument?  

Since 4.1.6 does not require it, I would say, no, the setjmp implementation
may evaluate its argument more than once.  This is also compatible with the
intention of the setjmp/longjmp specification, for which I collected
information about existing practice on an extremely wide variety of
implementations.