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From: guy%gorodish@Sun.COM
Newsgroups: comp.lang.c
Subject: Re: Use of #pragma
Message-ID: <7002@brl-adm.ARPA>
Date: Tue, 21-Apr-87 09:51:18 EST
Article-I.D.: brl-adm.7002
Posted: Tue Apr 21 09:51:18 1987
Date-Received: Wed, 22-Apr-87 03:13:13 EST
Sender: news@brl-adm.ARPA
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>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.)