Hi all!

I saw that Doug and Pascal had an exchange about a year back regarding forcing 
32-bit clients to get "pushed" to 64-bit clients (see 
http://dev.eclipse.org/mhonarc/lists/p2-dev/msg05383.html).

I'd love to get any details Doug may have had about how he achieved this. We 
have many users on Macs who are using a 32-bit version of our RCP, but we'd 
like to discontinue 32-bit builds and push them onto the 64-bit builds without 
basically sending out a ton of emails asking users to reinstall (and hoping 
they'll read it and do it).  I'm guessing this is something that the Eclipse 
folks in general may want to do as Mac moves away from 32-bit and likely may 
drop support at some point?

I'm guessing we'd have to have some sort of Job run on startup/before update 
checks on Mac 32-bit installs that would get the IProfile, then modify the 
IProfile.PROP_ENVIRONMENTS string to set the arch to x86_64, then do the normal 
update check? Maybe we can just permanently set it to some osgi.os value that 
says it supports both x86 and x86_64?

Thanks!
- Chris
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