Hello. I use cargo xbuild to build my OS. Recently build failed with the following error message.

error: failed to get bitcode from object file for LTO (Bitcode section not found in object file)

My repository is this and cargo_settings.json is specified as the target. You can reproduce this by running make on the master branch. I also tried with phil-opp's .json file, but build failed. The only thing which made it possible to build is to disable lto ( lto = false in Cargo.toml) . cargo clean && cargo xbuild did not solve the problem.
This is my CI history. You can see that the same commit succeeds and fails to build.