> Not a big issue, but slightly better if (O_CLOEXEC>>32) != 0 is also true.  
> See, if AIX should ever define this to a sensible value, the above would 
> disappear the feature.  However, if they did, then this expression should 
> then be false.

Sounds good.
This being a libbacktrace patch, you need Ian to approve it, it’s his area.

FX

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