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ct-ng: force host=i486 when building on x86_64

I'm using crosstool-ng on an x86_64 machine. I'd like the resulting
compiler to run on a 32-bit x86 (i486).

I tried setting --host=i486-linux-gnu in the c-compiler options, but
the libraries still configure for x86_64, which doesn't seem like it
will work.

Is there a supported way to do this, or do I have to resort to a
Canadian-cross style build?

--
Brian St. Pierre

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