[bug #64421] [troff] link-time optimization changes `.m` register initialization

[Dave]

Follow-up Comment #34, bug #64421 (project groff):

[comment #33 comment #33:]
> Time to find out by grubbing around in ELF x86-64 ABI documentation
> I guess--printed copies of it are the cobblestones of the byways
> of Hell--to see if this is a bug in link-time optimization.

I'd never seek to deny someone the pleasure of reading ELF x86-64 ABI
documentation.  But since groff should be able to compile and behave
deterministically in non-ELF-x86-64 environments, is the more relevant
question what the language itself guarantees about uninitialized variables?


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