Why do you expect problems?
Is it the Gnu-compiler buggy (behaving wrongly when using the -fast option)?
What kind of package depends so deeply on machine level instruction set to raise problems?
Well, our experience is to use '-fast' in extreme cases. It enables options that even Apple says they may degrade performance.
Testing some of our software on the G5 we had one notable proof of that: 13 seconds to perform the test with '-fast' and only 1.4 seconds with just using '-mcpu=G5 -mtune=G5 -mpowerpc-gopt -O2' .
So, beware of '-fast'.
Thanks! To take advantage of experienced experts helps a lot! I won't loose personal and CPU time in useless tries!
So I understand that for sure I always have to use -mcpu=G5 and -mtune=G5, but why not using -O3 instead of -O2?
And what about adding -mpowerpc64?
And -mpowerpc-gopt is for enabling or disabling (for safeness) G5 specifics?
Regards, -- Marco.
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