[Bug 246630] stable/11 regression: base.txz reproducibility depends on number of cpu cores

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246630

--- Comment #13 from Dimitry Andric <dim at FreeBSD.org> ---
This is an interesting bug, but what is the easiest way to reproduce? Does
anybody know which particular .c file, or even which particular function is
apparently compiled differently?

Note that clang is really single threaded, so I don't understand how the number
of cores can affect the result. Maybe the non-determinism (if it really exists)
is independent of the number of cores, but changing that influences stack
allocations, etc?

And is this *only* on 11.x? Because that is still using BFD ld, as far as I
know. Although the linker shouldn't matter...

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