Taking a look at The Github actions run on main, there appears to a build flake related to linking Nexus.

In the logs, this issues presents as the following:

Running `rustc --crate-name omicron_nexus ...
error: linking with `cc` failed: exit status: 1
...
  = note: collect2: error: ld returned 1 exit status
error: could not compile `omicron-nexus` due to previous error

Caused by:
  process didn't exit successfully: `rustc --crate-name omicron_nexus ...`

AFAICT, the first sign of this issue happening is roughly co-located with the following PRs:

• First appeared in https://github.com/oxidecomputer/omicron/actions/runs/2078057645 , in @jgallagher 's merge of MGS: Finish extracting SP communications to its own crate #786
• This was preceded by a handful of changes by @davepacheco for the "new internal lookup API"

However, given the flaky nature of the build, it is difficult to determine a root cause quite yet.

@jgallagher , @davepacheco - any chance this error looks familiar? Any known changes to linkage?