How do you get gnu gcc to build a 64 bit binary compiler?

[Joe Young]

Problems building 64 bit gnu gcc
x86 Solaris 10
source gcc-3.4.6

How do you get gnu gcc to build a 64 bit binary compiler?

I've got two gcc-3.4.6 source directories. And am compiling the first
with
./configure -with-arch-64=i386 --with-tune-64=i386 --with-cpu-64=i386
in order to make a 64 bit capable gcc compiler ready and able to
compile the second source directory with the same configure line (albeit with
a different destination and install directory) in order to end up with a
64 bit gcc compiler.

The problem is that both compilations produce the same result, a 32
bit gcc /usr/local/bin/gcc: ELF 32-bit LSB executable 80386 Version 1 [FPU],
dynamically linked, not stripped

Below is a list of compile options for gnu gcc
http://gcc.gnu.org/install/configure.html