Calvin Spealman <[EMAIL PROTECTED]> writes:

> but amd64 is itself an extension of the x86 architecture, isn't that the 
> case? amd64 chips run x86 code, i'm sure. do
> they not support those extensions? I understand that for some reason the USE 
> flags are irrelevent here, but I don't
> understand why and it is starting to drive me crazy because I'm just missing 
> something here.

The reason is that with the x86 arch, not all processors support all
of these features. So the USE flags allow the user to specify which
features their processor (or the one for which they are building)
supports. For amd64, there is no variation in the features supported,
so these USE flags are not needed for amd64.
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