[patches] how does ports/unique cpu selection work?

[Kumar Gala <galak@xxxxxxxxxxxxxxxxxxx>]

I've been looking at the code and hoping someone could point me in the right direction on how a given unique processor that might have optimized libraries is chosen via the build/config system.

For example on powerpc how does one get the code in 'libc/sysdeps/powerpc/powerpc32/a2' picked up when doing a build?

thanks

- k