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Date: Tue, 11 Mar 2008 22:28:19 +0100
From: Kris Kennaway <kris@FreeBSD.org>
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To: Ruben Lara <bermejator@hotmail.com>
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Cc: freebsd-stable@freebsd.org
Subject: Re: "Implicit declaration of built-in function" upgrading to 7.0
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Ruben Lara wrote:
> Hi!
> 
> I solved problem with memory, but now, make buildworld crash with next error:
> 
> ....
> /usr/src/gnu/lib/libgcc/../../../contrib/gcc/unwind.inc:238: warning: incompatible implicit declaration of built-in function ´abort´
> /usr/src/gnu/lib/libgcc/../../../contrib/gcc/unwind.inc:In function ´_Unwind_Resume_or_Rethrow´:
> /usr/src/gnu/lib/libgcc/../../../contrib/gcc/unwind.inc:263: warning: incompatible implicit declaration of built-in function ´abort´
> *** Error code 1
> .....
> 
> Anybody can help meżż?

Probably because you set CFLAGS= (no optimization).  Note that no-one 
told you to do that :-)

Kris