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03122e1bac
In JSON output, emit a directive after metadata is generated. To implement pipelining, Cargo needs to know when metadata generation is finished. This is done via a new JSON "directive". Unfortunately, metadata file writing currently occurs very late during compilation, so pipelining won't produce a speed-up. Moving metadata file writing earlier will be a follow-up. r? @alexcrichton
The codegen crate contains the code to convert from MIR into LLVM IR,
and then from LLVM IR into machine code. In general it contains code
that runs towards the end of the compilation process.
For more information about how codegen works, see the rustc guide.