> > 4. Find the option for disabling strict alias and get configure to
add
> > that.
> 
> You'll still lose performance, but the option is "-qalias=noansi".

My old xlc does not show that option, it is unfortunately version
specific.
The currently compatible option to turn it off would be -qnoansialias

So we can use:
xlc -qnoansialias

The default cc options are: -qlanglvl=extended -qnoro -qnoroconst
So I guess we could also use (but above is imho clearer/better): 
cc -qro -qroconst -qlanglvl=extc89

Andreas

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