There's no reason to include block helpers in package:objective_c, as they're not exported publicly. If users need to interact with an API in package:objective_c that uses blocks, they use the helpers code genned in their own bindings. The native trampoline functions for these blocks are compiled into the package:objective_c dylib, which also causes a bit of code bloat. We just need to look for the package:objective_c config flag, and then not code gen the block helpers if we see this flag.