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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: "incompatible implicit declaration" warnings with GCC 4.2.1
Date: Tue, 23 Oct 2007 06:05:53 +0200
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Cc: emacs-devel@gnu.org, jasonr@gnu.org
To: "Juanma Barranquero" <lekktu@gmail.com>
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> Date: Mon, 22 Oct 2007 23:55:29 +0200
> From: "Juanma Barranquero" <lekktu@gmail.com>
> Cc: "Eli Zaretskii" <eliz@gnu.org>, emacs-devel@gnu.org
> 
> I'd really like to know why this include shuffling is suddenly needed
> with GCC 4.2.1...

Evidently, GCC 4.2.1 now has more functions implemented as built-ins,
among them `pow' and `abort'.  This means that GCC knows their
prototypes even without seeing the header file in which they are
supposed to be declared.  Thus, it can now issue warnings where it
previously couldn't.