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why "m32" in 'configuring kernel'?

I'm reading amd64 howto and I don't understand why in end section about
kernel configuration the FAQ say:

Configuring the kernel

make HOSTCC="gcc -m32" ARCH="x86_64" menuconfig

Be sure to include IA32 emulation, otherwise you will not be able to run
multiarch or i386 binaries on your host system or in a chroot. And for
simplicity, build a monolithic kernel without any modules.

make HOSTCC="gcc -m32" ARCH="x86_64" bzImage

why "m32" and not "m64"? 



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