From the root of the repository after setting up the development toolchain run
yarn wrapper:obj-c:build
To update Rust static library run
yarn wrapper:obj-c:update-binary
It will generate libbbs.a binary under libraries/libbbs.a for Objective-C wrapper to consume.
Due to rust ending support for 32bit targets this pod only works with x86_64 and arm64 see here for more details.