From owner-freebsd-current  Sat Jun 15 12:49:34 2002
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Date: Sat, 15 Jun 2002 12:49:29 -0700
From: Maxime Henrion <mux@freebsd.org>
To: current@FreeBSD.org
Cc: Terry Lambert <tlambert2@mindspring.com>
Subject: Re: duplicate -ffreestanding in kernel build
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References: <20020615191003.I747-100000@gamplex.bde.org> <3D0B9888.372EAA3E@mindspring.com>
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Terry Lambert wrote:
> What exactly does this do, besides implying "-fno-builtin"?
> 
> The documentation says "and implies main has no special requirements"...
> 
> Neither the kernel nor modules have a "main", so the only thing that's
> relevent here is the "-fno-builtin", right?

IIRC, -ffreestanding prevented GCC3 from being stupid optimizations like
changing occurences of printf("constant string\n") to puts("constant
string"), which failed for kernel builds since we don't have puts() in
the kernel...

Maxime

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