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The perils of transition to 64-bit time_t
(blogs.gentoo.org)
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Great, then we just leave everything alone and say 32-bit user land is broken past 2038, doubt too many people are dying to run 32-bit userland after that, but if they are I can guarantee they'll be running old binaries probably without source.
I might be selfish for saying so, but if anyone set up their mind to run anything on a 32-bit system after 2038, they must care enough to compile themselves, right? Any binaries compiled today will be EOL by then.
I think this is a reasonable assumption, but my experience suggests it will absolutely not be true for a lot of proprietary software.
That being said, that stuff will only be supported on rhel which will bend over backwards to keep it sort of working somehow.