machine/platform separation

[Simon 'corecode' Schubert]

Thomas E. Spanjaard wrote:
My point is, that nomenclature is not sensible, only commonly used. 
Though, I see no problem in supporting both TARGET_PLATFORM=foo and 
TARGET_ARCH=bar for the people that have a preference towards either of 
them.
this is not a beauty contest for architecture names.  this is about easy and concise categorization of our sources and targets.  and starting from there, using the "most commonly used" name for a particular purpose makes very much sense.

so, what is

cpu
machine
arch
machine_arch
platform
and how do they relate?

cheers
 simon
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