Help with arm64 binaries build reproducibility issue

[Luca Boccassi]

Hello,

We have been having an issue with making the systemd build reproducible
on arm64. On x86 it's all fine, but on arm there are differences in the
built binaries that I cannot explain - I don't speak arm assembly so I
can't really tell where they are coming from.

Any suggestion where to look at, or for what the issue might be, would
be hugely welcome, as I am quite stuck.

Some excerpts:

b»      5b710·<e843419 at 012a_000033f9_ca8>   
b»      5b710·<e843419 at 0126_000033f9_ca8>

000000000005b710·<e843419 at 012a_000033f9_ca8>:
000000000005b710·<e843419 at 0126_000033f9_ca8>:

e843419 at 012a_000033f9_ca8():
e843419 at 0126_000033f9_ca8():


145233	»       ldr»    x2,·[x1]	 
145234	»       b»      96008·<link_node_enumerator+0xd8>	 
145235	»       ldr»    x24,·[x24,·#3896]
145236	»       b»      8e008·<bus_link_method_set_dnssec_negative_trust_anchors+0x138>

145233	»       ldr»    x24,·[x24,·#3896]
145234	»       b»      8e008·<bus_link_method_set_dnssec_negative_trust_anchors+0x138>
145235	»       ldr»    x2,·[x1]
145236	»       b»      96008·<link_node_enumerator+0xd8>

https://tests.reproducible-builds.org/debian/rb-pkg/experimental/arm64/diffoscope-results/systemd.html

Thanks!

-- 
Kind regards,
Luca Boccassi
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