Path: utzoo!attcan!uunet!world!decwrl!lll-winken!elroy.jpl.nasa.gov!jpl-devvax!david
From: david@jpl-devvax.JPL.NASA.GOV (David E. Smyth)
Newsgroups: comp.lang.c
Subject: Func Protos with K&R Func Defs
Message-ID: <11614@jpl-devvax.JPL.NASA.GOV>
Date: 28 Feb 91 01:11:10 GMT
Reply-To: david@jpl-devvax.JPL.NASA.GOV (David E. Smyth)
Organization: Jet Propulsion Laboratory, Pasadena, CA
Lines: 43

I do this all the time:

in WcCreate.h:

    #ifdef _FUNCTION_PROTOTYPES
    ...
    extern void WcWidgetCreation ( Widget root );
    ...
    #else
    ...
    extern void WcWidgetCreation();
    ...
    #endif

in WcCreate.c:

    void WcWidgetCreation ( root )
        Widget       root;
    {
        ...
    }

This seems like the easiest way to use prototyped function declatations
when your compiler supports it, and K&R function definitions in any
case.  Then only the *.h files need to have #ifdef's.

Then "gcc -ansi -D_FUNCTION_PROTOTYPES" still does return type and
argument checking across function calls, as long as it sees the
prototyped function declaration before it is used somewhere.  And "cc"
still does little or no checking...

Does anybody have any problems with this on their compilers?

-------------------------------------------------------------------------
David Smyth				david@jpl-devvax.jpl.nasa.gov
Senior Software Engineer,		seismo!cit-vax!jpl-devvax!david
X and Object Guru.			(818)393-0983
Jet Propulsion Lab, M/S 230-103, 4800 Oak Grove Drive, Pasadena, CA 91109
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