Yes Thanks, I modified the --build to my x86 and --host to arm-linux,
and set bash_cv_have_mbstate_t to yes, now to compiles ok, I can debug on 
arm platform!



>From: Jim Blandy <jimb@red-bean.com>
>To: yang xiaoli <alula418@hotmail.com>
>CC: gdb@sourceware.org
>Subject: Re: how to cross-compile gdb for arm?
>Date: Mon, 28 Nov 2005 01:57:29 -0800
>
>On 11/28/05, yang xiaoli <alula418@hotmail.com> wrote:
> > I'll corss-compile gdb for arm board, will use gdb to debug on arm 
board.
> > I use gdb6.0 or gdb6.3 and configure with:
> > CC=arm-linux-gcc ../gdb-6.3/configure --target=arm-linux \
> > --build=arm-linux --host=arm-linux
>
>What kind of machine are you compiling GDB itself on?  That should be
>your --build.
>
>What kind of machine do you intend to run GDB on while you debug your
>ARM programs?  That should be your --host.
>
>Will you run GDB on the same machine as the program being debugged?
>Then your --host and --target should be the same.  If you're going to
>run GDB on a different kind of machine (and debug over the network, or
>over a serial line), then your --host and --target should be
>different.

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