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According to $GCC/gcc/config/rs6000/rs6000-c.c _ARCH_PPC is the
ubiquitous define which should be used to test whether gcc targets
PowerPC, on 64bit platforms _ARCH_PPC64 will be also defined.

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HOST_PPC alone can't be a substitute for __powerpc__ which is defined
for both 32 and 64bit PPCs, so go with HOST_PPC || HOST_PPC64 instead.

Reported by C. W. Betts

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__powerpc__ is not defined on AIX and Darwin, Makefile.target adds
it to CPPFLAGS for target specific code which cache-utils are not.

Since there's not common definition which can safely be used on all
platforms use HOST_PPC provided by config-host.h

The problem was originally reported by C. W. Betts

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I'm cross-compiling, and linux/auxvec.h was not installed with my glibc
headers. How about this:

Don't require linux/auxvec.h, which isn't always installed with libc.
Signed-off-by: NHollis Blanchard <hollisb@us.ibm.com>

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Thanks to Segher Boessenkool and Holis Blanchard.

AIX and Darwin cache inquiry:
http://gcc.gnu.org/ml/gcc-patches/2007-08/msg00388.html

Auxiliary vectors:
http://manugarg.googlepages.com/aboutelfauxiliaryvectors

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