On Wed, 10 Apr 2002, John M McIntosh wrote:

> cc -dumpspecs gives among lots of other info
> 
> *predefines:
> -D__ppc__ -D__NATURAL_ALIGNMENT__ -D__MACH__ -D__BIG_ENDIAN__ -D__APPLE__

On SourceForge's compilefarm "[PPC - G4] MacOS X 10.1 SERVER Edition"  
gives this:

Welcome to Darwin!
bash-2.05a$ uname -a
Darwin usf-cf-ppc-macosx-1 5.3 Darwin Kernel Version 5.3: Thu Jan 24 
22:06:02 PST 2002; root:xnu/xnu-201.19.obj~1/RELEASE_PPC  Power Macintosh 
powerpc
bash-2.05a$ cc -E -dM - < /dev/null
#define __MACH__ 1 
#define __NATURAL_ALIGNMENT__ 1 
#define __APPLE__ 1 
#define __GNUC_MINOR__ 95 
#define __ppc__ 1 
#define __GNUC__ 2 
#define __STDC__ 1 
#define __DYNAMIC__ 1 
#define __APPLE_CC__ 932 
#define __BIG_ENDIAN__ 1 
bash-2.05a$ 


-- Bert