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From: guy%gorodish@Sun.COM (Guy Harris)
Newsgroups: comp.lang.c
Subject: Re: Use of #pragma
Message-ID: <17002@sun.uucp>
Date: Mon, 20-Apr-87 13:20:58 EST
Article-I.D.: sun.17002
Posted: Mon Apr 20 13:20:58 1987
Date-Received: Tue, 21-Apr-87 02:43:18 EST
References: <6966@brl-adm.ARPA>
Sender: news@sun.uucp
Reply-To: guy@sun.UUCP (Guy Harris)
Organization: Sun Microsystems, Mountain View
Lines: 25

>Since I don't have the dpANS nor the ready cash to get one, I may
>be asking a question already answered there.
>
>Is there a mechanism for allowing the temporary change of compilation
>state (presumably with #pragma)?

The ANSI draft standard says

	NOTHING WHATSOEVER

about the interpretation of #pragmas, except that:

	   A #pragma preprocessing directive causes the
	implementation to behave in an implementation-defined manner.
	Any pragma that is not recognized by an implementation is
	ignored.

(3.8.6 Pragma directive, p. 82, October 1, 1986 draft).

I don't think the ANSI standard will ever say anything about turning
optimization on or off, especially about turning *specific
optimizations* on or off.  (At least I sure *hope* it doesn't; it
should *not* assume that the only optimization technologies used in
compilers will be the ones known to the authors of the standard at
the time they write the standard.)