Hi Heikki, 
Thank you for your feedback.
> This looks weird. Sure, "-O2" makes things faster, but we shouldn't 
> force that here. If you want optimizations, you should use pass 
> CFLAGS="-O2" or CFLAGS="-O3" to configure. And why the special mention 
> of MemSet() and MemSetAlign()?
I have removed these.
> I see there's some references to MAKE_EXPORTS in src/backend/Makefile. 
> They seem related to MKLDEXPORT, but we never set MAKE_EXPORTS. Are they 
> still needed?
If MAKE_EXPORTS is not being used by any platforms other than AIX, we can
consider removing it. However, I’m not entirely certain whether it might still
be required elsewhere.  Since these changes appear to be general and not
strictly AIX-specific, would it be fine to submit them as a separate
patch?
Looking forward to your continued support and guidance.
- Sriram.