[R-SIG-Mac] macos 26 considerations

[biii+rsigm@c m@iii@g oii 8p@wexpress@com]

I’ve been holding off upgrading to MacOS 26 for many reasons, most 
related to yet-unsubstantiated concerns about R. Because it’s a new ABI, 
I suspect the process would be similar to a major/minor release in R: 
update the compile chain then re-install all packages. Is there a strong 
recommendation for or against this upgrade? Are there safe or at least 
less-risky pathways for upgrading the OS? Is R-devel regularly tested 
against 26? Are there known unresolved problems, such as “package xyz 
does not currently work”?

FTR: I’m currently on macos 15.7.4 using R-4.5.2, and there is nothing 
inherently broken. I don’t have a /need/ to upgrade to 26 atm but fear 
at some point that some tool I use (be it Parallels or something else) 
may eventually require 26 for some or all of the desired functionality. 
I’m just planning ahead (and holding back two colleagues, also on 
macos-15.7).

Thank you!
Bill

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