Re: Pre-Parsers

brynjulv.hauksson@sds.no
12 Oct 2000 21:57:56 -0400

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From: brynjulv.hauksson@sds.no
Newsgroups: comp.compilers
Date: 12 Oct 2000 21:57:56 -0400
Organization: Interpost
References: 00-09-119 00-09-155 00-10-044
Keywords: C, standards

Hans-Bernhard Broeker <broeker@physik.rwth-aachen.de> writes:


> [Sorry for jumping in so late, on this... ]
>
> > I often found source code with something like:
>
> > #if sizeof(int)==2 ...
>
> > Here sizeof() must be evaluated by the preprocessor.
>
> 'Must' is debatable, here. With equal justification, one could say
> that source that contains such lines 'must' be rejected for being
> incompatible with the definition of the language it's supposed to be
> written in...
> --
> Hans-Bernhard Broeker (broeker@physik.rwth-aachen.de)
> Even if all the snow were burnt, ashes would remain.
> [What definition would that be? ANSI/ISO C certainly permits sizeof in
> preprocessor expressions. -John]


Maybe I'm missing something obvious here, but in C89 (at least
according to "ANSI and ISO Standard C; Programmer's Reference" by
Plauger & Brodie) you cannot use the sizeof operator in preprocessor
*conditional* excpressions.


-brynjulv

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