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Defining __powerpc__ in rs6000.h


Would it be possible to define __powerpc__, __ppc__, etc... in
CPP_CPU_SPEC, or something simular as is done in i386/i386.h and
alpha/alpha.h?  

The lack of having these CPU defines defined automatically is all that
prevents one from using an OS-wide CPP_PREDEFINES in a PowerPC port.

-- 
-- David  (obrien@FreeBSD.org)


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