32-bit mode x86_64-unknown-none

How do I go about using 32-bit mode in the x86_64-unknown-none target?

You did need to use an i686-unknown-none tatget instead. x86_64-unknown-none is specifically for the 64bit mode of x86 cpus. i686-unknown-none isn't built into rustc itself, so you will need to write a custom target specification json file instead.

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