Only on cross-compiled 32-bit Windows builds:
[task 2020-04-29T17:44:21.464Z] 17:44:21 INFO - Running `/builds/worker/workspace/obj-build/release/build/osclientcerts-static-a635d25fcf6bc547/build-script-build`
[task 2020-04-29T17:44:21.465Z] 17:44:21 ERROR - [osclientcerts-static 0.1.4] /builds/worker/checkouts/gecko/vs2017_15.8.4/SDK/include/10.0.17134.0/um/winnt.h:959:5: error: MS-style inline assembly is not available: Unable to find target for this triple (no targets are registered)
That error message comes from LLVM here. I believe this happens during cbindgen's processing of this code in osclientcerts. But I'm still trying to figure out what this error actually means...