Add experimental_rustc_incremental flag#18
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Inject -Cincremental=<output_base>/.rustc_incremental_cache/... into rustc via process_wrapper when the new //rust/settings:experimental_rustc_incremental flag is set. Cache is keyed on rustc path, target, crate name, edition, action kind (full vs hollow-metadata), and a stable hash of compilation- relevant flags; argfiles are expanded at key-compute time so the values survive Bazel's param-file rewrite. Non-hermetic and local-only by design. The setting docstring documents the required --strategy=Rustc=local, --strategy=RustcMetadata=local, and --remote_upload_local_results=false recipe, plus the codegen-units runtime-perf caveat. Local benchmarking shows warm incremental rebuilds working & performing on-par with cargo
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Inject -Cincremental=<output_base>/.rustc_incremental_cache/... into rustc via process_wrapper when the new //rust/settings:experimental_rustc_incremental flag is set.
Non-hermetic and local-only by design. The setting docstring documents the required --strategy=Rustc=local,
--strategy=RustcMetadata=local, and --remote_upload_local_results=false recipe, plus the codegen-units runtime-perf caveat.
Local benchmarking shows warm incremental rebuilds working & performing on-par with cargo