From owner-cvs-all  Mon May 28  4:45:50 2001
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Date: Mon, 28 May 2001 21:43:58 +1000 (EST)
From: Bruce Evans <bde@zeta.org.au>
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To: Sheldon Hearn <sheldonh@uunet.co.za>
Cc: Dima Dorfman <dd@FreeBSD.org>, cvs-committers@FreeBSD.org,
	cvs-all@FreeBSD.org
Subject: Re: cvs commit: src/usr.bin/jot Makefile jot.c 
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On Mon, 28 May 2001, Sheldon Hearn wrote:

> On Sun, 27 May 2001 17:55:52 MST, Dima Dorfman wrote:
> 
> >   Modified files:
> >     usr.bin/jot          Makefile jot.c 
> >   Log:
> >   Silence warnings and compile with WARNS=2 on i386 and alpha.
> 
> Since when do you have to add a prototype for main()?!

Since -Wmissing-prototypes was added to CFLAGS (by WARNS=2 or BDECFLAGS)
to detect the potential error of not declaring extern functions in
the right place (which is never in *.c).  main() is a special case,
however.  It can't be declared in a header file in C because in the
hosted (non-freestanding) case there are several valid but inconsistent
prototypes for it:

	int main(void);			/* required to work by ISO C90 */
	int main(int argc, char **argv);	/* same */
	int main(int argc, char **argv, char **envp);	/* optional POSIX */
	int main(anything);		/* optional implementation-defined */

gcc shouldn't warn about main() not being prototyped before it is
defined even with -Wmissing-prototypes, but it currently warns about
it if the definition is old-style.  gcc -ffreestanding also seems to
be broken.  I think main() should not be special then, but it is.

Bruce


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