Linux Kernel can be compiled in a machine for a different architecture. This is useful in fixing compilation issues for different architectures without actually using them.
Using ARCH option, the target architecture can be specified. It is also possible to specify the cross-compile toolchain through CROSS_COMPILE and specific compiler using CC options.
Example:
To compile the kernel for a 64-bit Intel platform,
# make ARCH=x86_64 defconfig
To compile with ARM toolchain at /usr/local/bin,
#...
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