From owner-freebsd-hackers@FreeBSD.ORG  Mon Jun 18 17:23:43 2012
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Date: Mon, 18 Jun 2012 13:23:25 -0400
From: "Dieter BSD" <dieterbsd@engineer.com>
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Subject: Re: EFI development tools
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> This is a known issue, and had been around for a long time.
> You can't reliably build 32 bit binaries (what the -m32 flag specifies)
> on a 64 bit system. The header files (and possibly other things) are wrong.

People build 32 bit binaries on 64 bit systems all the time.
It is called cross-compiling. I rather doubt that just
setting the -m32 flag is sufficient to set up a proper
cross-compiling environment.