Well, that *is* the normal thing on x86.
HOWEVER, I think the right thing for allyesconfig, allmodconfig,
randconfig, etc. is to be able to override specific variables. Right
now, one has to use indirection via a file, which is a bit clumsy; it
would be better if one could do "make allyesconfig CONFIG_X86_64=y" or
somesuch.
In fact, we should be able to get rid of ARCH entirely; CONFIG_ options
have the huge advantage that they're saved in a file, and you don't have
to type them on every make run. The only option that I can't see us
getting rid of easily is HOSTCC, since it is used before config is run,
but probably something clever can be done there, too.
-hpa
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