Need help w/ linux-hosted cross-compiler for sparc64

[Hamilton Chris-cham <chris dot hamilton at freescale dot com>]

I'm trying to build a gcc 3.4.1 cross-compiler that is hosted on i686-pc-linux and generates binaries for sparc-sun-solaris2.8.  This is what I've done (all on the linux host):

1. Build NATIVE binutils 2.15:

> tar xzf binutils-2.15.tar.gz; cd binutils-2.15;
> /u/cham/binutils-2.15/configure --prefix=/pkg/gcc-3.4.1-sparc64/native-binutils --disable-nls --enable-64-bit-bfd && make && make install
> cd ..; rm -rf binutils-2.15

2. Build SPARC64 binutils

> tar xzf binutils-2.15.tar.gz; cd binutils-2.15;
> /u/cham/binutils-2.15/configure --prefix=/pkg/gcc-3.4.1-sparc64 --disable-nls --enable-64-bit-bfd --target=sparc64-elf && make && make install
> cd ..; rm -rf binutils-2.15

3. Build SPARC64 gcc

> tar xzf gcc-3.4.1.tar.gz; cd gcc-3.4.1; mkdir _build; cd _build
> /u/cham/gcc-3.4.1/configure --prefix=/pkg/gcc-3.4.1 --enable-threads --enable-shared --with-ld=/pkg/gcc-3.4.1/native-binutils/bin/ld --with-as=/pkg/gcc-3.4.1/native-binutils/bin/as --with-nm=/pkg/gcc-3.4.1/native-binutils/bin/nm --enable-languages=c,c++ --disable-nls --target=sparc64-elf
> make

This fails at during the gcc bootstrapping step:

--- begin output
/bin/ksh /u/cham/gcc-3.4.1/gcc/mkconfig.sh tconfig.h
./xgcc -B./ -B/_TOOLS_/dist/gnu-gcc-3.4.1-binutils-2.15-sparc64-elf/i686-pc-linux2.4/sparc64-elf/bin/ -isystem /pkg/gcc-3.4.1-sparc64/i686-pc-linux2.4/sparc64-elf/include -isystem /pkg/gcc-3.4.1-sparc64/i686-pc-linux2.4/sparc64-elf/sys-include -L/u/cham/gcc-3.4.1/_build/gcc/../ld -O2 -DIN_GCC -DCROSS_COMPILE   -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition  -isystem ./include -I. -I. -I/u/cham/gcc-3.4.1/gcc -I/u/cham/gcc-3.4.1/gcc/. -I/u/cham/gcc-3.4.1/gcc/../include   -g0 -finhibit-size-directive -fno-inline-functions -fno-exceptions -fno-zero-initialized-in-bss -fno-unit-at-a-time  \
  -Dinhibit_libc -c /u/cham/gcc-3.4.1/gcc/crtstuff.c -DCRT_BEGIN \
  -o crtbegin.o
/pkg/gcc-3.4.1-sparc64/native-binutils/bin/as: unrecognized option `-xarch=v8plus'
make[2]: *** [crtbegin.o] Error 1
make[2]: Leaving directory `/u/cham/gcc-3.4.1/_build/gcc'
make[1]: *** [stage1_build] Error 2
make[1]: Leaving directory `/u/cham/gcc-3.4.1/_build/gcc'
make: *** [bootstrap] Error 2

--- end output

Should I be supplying the SPARC64 binutils to the gcc configure options --with-ld, --with-as, etc.?  Or have I done something else incorrectly?

Chris