Building an external x86_64 module from an x86 (32-bit) machine?

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Hi,

Running a 2.6.35 kernel, and gcc 4.4.5, I'm trying to build both an
x86 (32) and an x86_64 external (out of tree) module from my x86
(32-bit) dev machine.

I have tried various tricks, such as using ARCH=X86_64 when running
make, but to no avail so far: Whatever I do, V=1 shows kbuild invoking
gcc with -m32 and ld with elf_i386.

I have googled around for a few hours without finding a solution to
the problem.
Since the x86 arch is unified and gcc is able to gen (and link) x86_64
targets, it looks like this could be done, and I must be missing
something.
Could anyone point me to the right direction?

TIA!

PhA.
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