why my cross-gcc cannot find system root libs?

[loody <miloody at gmail dot com>]

dear all:
I attach my error at the end of letter.
I did see libc.a in sysroot/usr/lib, but my ld complains he cannot find it.
I also check the options I set in ld.pdf but it seems all fine.
did I miss something while build the toolchain?
appreciate your help,
miloody

mipsel-unknown-linux-uclibc-ld -T ./link.xn -o TestCode.elf -Map
TestCode.map --oformat elf32-tradlittlemips  reset.o cpufunc.o host.o
Interrupt.o main.o memtst.o ntsys.o diskio.o FileSystem.o tff.o misc.o
DMA.o GPIO.o SDMMC.o Storage.o ntuart.o uart.o -static -lc
mipsel-unknown-linux-uclibc-ld: cannot find -lc
make: *** [TestCode.elf] Error 1

# mipsel-unknown-linux-uclibc-gcc -v
Using built-in specs.
Target: mipsel-unknown-linux-uclibc
Configured with: /root/toolchain/targets/src/gcc-4.1.2/configure
--build=i486-build_pc-linux-gnu --host=i486-build_pc-linux-gnu
--target=mipsel-unknown-linux-uclibc
--prefix=/root/x-tools/mipsel-unknown-linux-uclibc
--with-sysroot=/root/x-tools/mipsel-unknown-linux-uclibc/mipsel-unknown-linux-uclibc//sys-root
--enable-languages=c --disable-multilib --with-float=soft
--enable-__cxa_atexit
--with-local-prefix=/root/x-tools/mipsel-unknown-linux-uclibc/mipsel-unknown-linux-uclibc//sys-root
--disable-nls --enable-threads=posix --enable-symvers=gnu --enable-c99
--enable-long-long --enable-target-optspace
Thread model: posix
gcc version 4.1.2

# ls /root/x-tools/mipsel-unknown-linux-uclibc/mipsel-unknown-linux-uclibc/sys-root/usr/lib/
crt1.o              libcurses.so        libmenu.a
libncurses.so.5     libpthread.a        libthread_db_pic.a
crti.o              libdl.a             libmenu_g.a
libncurses.so.5.6   libpthread_pic.a    libthread_db.so
crtn.o              libdl_pic.a         libmenu.so          libnsl.a
         libpthread.so       libutil.a
libc.a              libdl.so            libmenu.so.5
libnsl_pic.a        libresolv.a         libutil_pic.a
libc_pic.a          libform.a           libmenu.so.5.6      libnsl.so
         libresolv_pic.a     libutil.so
libcrypt.a          libform_g.a         libm_pic.a          libpanel.a
         libresolv.so        Scrt1.o
libcrypt_pic.a      libform.so          libm.so
libpanel_g.a        librt.a             terminfo/
libcrypt.so         libform.so.5        libncurses.a
libpanel.so         librt_pic.a         uclibc_nonshared.a
libc.so             libform.so.5.6      libncurses_g.a
libpanel.so.5       librt.so
libcurses.a         libm.a              libncurses.so
libpanel.so.5.6     libthread_db.a

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