[help] rebuild libc failed

[majia gm]

2011/8/4 Dimitry Andric <dim at 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.  Otherwise, run "make toolchain" first, followed by "make
> buildenv".  In 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.