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gcc build second pass : C compiler cannot create executables

Try to make a gcc cross compiler ,

0 perpare vars in env

        export HOST=x86_64-pc-linux-gnu
        export BUILD=$HOST
        export TARGET=x86_64-none-linux-gnu
        export CROSS_TOOL=/vita/cross-tool
        export CROSS_GCC_TMP=/vita/cross-gcc-tmp
        export SYSROOT=/vita/sysroot

1 build binutilss

     ../binutils-2.23.1/configure --prefix=$CROSS_TOOL \
     --target=$TARGET --with-sysroot=$SYSROOT

 build success
 then add this lines to .bashrc And this want build glibc next use the
tools I just build

    export AR="$TARGET-ar"
    export AS="$TARGET-as"
    export RANLIB="$TARGET-ranlib"
    export LD="$TARGET-ld"
    export STRIP="$TARGET-strip"

2 build freestanding compiler first perpare gmp source

     cd gcc-4.7.2/
     tar -xvf ../../source/mpfr-3.1.1.tar.bz2
     tar -xvf ../../source/mpc-1.0.1.tar.gz
     tar -xvf ../../source/gmp-5.0.5.tar.bz2
     mv gmp-5.0.5/ gmp
     mv mpfr-3.1.1/ mpfr
     mv mpc-1.0.1/ mpc

then cd to gcc-build1

    ../gcc-4.7.2/configure --prefix=$CROSS_GCC_TMP --target=$TARGET \
    --with-sysroot=$SYSROOT --with-newlib --enable-languages=c \
    --with-mpfr-include=/vita/build/gcc-4.7.2/mpfr/src \
    --with-mpfr-lib=/vita/build/gcc-build1/mpfr/src/.libs \
    --disable-shared --disable-threads --disable-decimal-float \
    --disable-libquadmath --disable-libmudflap --disable-libgomp \
    --disable-nls --disable-libssp --disable-multilib

  succss . So add this line  the ~/.bashrc  (this will use this build
gcc to build a second gcc )

    export CC="$TARGET-gcc"

3 build glibc

    ../glibc-2.15/configure --prefix=/usr --host=$TARGET \
    --enable-kernel=3.7.4 --enable-add-ons \
    libc_cv_forced_unwind=yes libc_cv_c_cleanup=yes \

and make and install

    make install_root=$SYSROOT install

after install :

     vita@engine-virtual-machine:/vita$ ls sysroot/usr/lib64/*.o
     sysroot/usr/lib64/crt1.o  sysroot/usr/lib64/crtn.o
     sysroot/usr/lib64/crti.o  sysroot/usr/lib64/gcrt1.o

4 build second pass gcc  , cd to gcc-build2

    ../gcc-4.7.2/configure --prefix=$CROSS_TOOL --target=$TARGET \
    --with-sysroot=$SYSROOT \
    --with-newlib --enable-languages=c,c++  \
    --with-mpfr-include=/vita/build/gcc-4.7.2/mpfr/src \
    --with-mpfr-lib=/vita/build/gcc-build2/mpfr/src/.libs \
    --disable-multilib --enable-threads=posix

Here will be error

    checking build system type... x86_64-unknown-linux-gnu
    checking host system type... x86_64-unknown-linux-gnu
    checking target system type... x86_64-none-linux-gnu
    checking for a BSD-compatible install... /usr/bin/install -c
    checking whether ln works... yes
    checking whether ln -s works... yes
    checking for a sed that does not truncate output... /bin/sed
    checking for gawk... gawk
    checking for libitm support... yes
    checking for gcc... x86_64-none-linux-gnu-gcc
    checking for C compiler default output file name...
    configure: error: in `/vita/build/gcc-build2':
    configure: error: C compiler cannot create executables

Then I cd /vita/cross-gcc-tmp/bin The first pass install dir :

./x86_64-none-linux-gnu-gcc test.c
    /vita/cross-tool/bin/x86_64-none-linux-gnu-ld: cannot find crt1.o:
No such file or directory
    /vita/cross-tool/bin/x86_64-none-linux-gnu-ld: cannot find crti.o:
No such file or directory
    collect2: error: ld returned 1 exit status

(I install bintuils in /vita/cross-tool  and install tmp gcc in
/vita/cross-gcc-tmp )

Here is question :
Seem  /vita/cross-tool/bin/x86_64-none-linux-gnu-ld  can't find crti.o
and  it don't know the $sysroot/usr/lib64 I already success build
So I am wondering the --with-sysroot=$SYSROOT  mean to search libs in
$SYSROOT, why it can't known ?

Any suggestion ?

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