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Date: Sun, 7 Aug 2011 22:38:51 +0800
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From: majia gm <gmmajia@gmail.com>
To: Dimitry Andric <dim@freebsd.org>
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Cc: freebsd-toolchain@freebsd.org
Subject: Re: [help] rebuild libc failed
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2011/8/4 Dimitry Andric <dim@freebsd.org>:
> On 2011-08-04 10:38, majia gm wrote:
>>
>> I'm building the libc code which derived from a current trunk
>> mirror/freebsd/head under PCBSD 8.2 which contains FreeBSD 8.2
>> release.
>> I'm trying to test the modified libc by using LD_LIBRARY_PATH. But
>> failed to build it.
>> I change the current direcotry into head/lib/libc and run make.
>
> You cannot always do this, especially not when going from 8.2 to head,
> because you need to build a toolchain first, which includes updated
> headers and other components.
>
> It's probably best to just run "make buildworld", which will take care
> of everything. =A0Otherwise, run "make toolchain" first, followed by "mak=
e
> buildenv". =A0In that build environment, you can just change to the
> lib/libc directory and run make.
>
> NOTE: Do *not* install the updated libc if you are running an old
> kernel, or you will most likely hose your system.
>

Thanks guys.
"make toolchain" works for me.