arch

file: /proc/sys/kernel/arch
variable: kernel.arch

Official reference

Set ARCH to the architecture to be built.

In most cases the name of the architecture is the same as the directory name found in the arch/ directory.

But some architectures such as x86 and sparc have aliases.

• x86: i386 for 32 bit, x86_64 for 64 bit
• parisc: parisc64 for 64 bit
• sparc: sparc32 for 32 bit, sparc64 for 64 bit