Add experimental_rustc_incremental flag#18
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walter-zeromatter wants to merge 25 commits intohermeticbuild:mainfrom
Open
Add experimental_rustc_incremental flag#18walter-zeromatter wants to merge 25 commits intohermeticbuild:mainfrom
walter-zeromatter wants to merge 25 commits intohermeticbuild:mainfrom
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…elbuild#3829)" This reverts commit f198dde.
…() (bazelbuild#3816)" This reverts commit 9586468.
…#3) * 0 * Add rust analyzer test coverage
…hollow rlibs: the RustcMetadata action runs rustc to completion with -Zno-codegen, emitting a .rlib archive. This approach mirrors the one used by buck2 and avoids needing to kill rustc mid-output in order to produce metadata. While not fixing problems with SVH mismatches when non-determinism, this does simplify the codepath and uses a production tested technique that doesn't have any of the dangers associated with killing the rustc process while it's still active.
Port the sharding wrapper feature from bazelbuild#3774 into the hermeticbuild fork. The implementation wraps rust_test executables when experimental_enable_sharding is set while keeping rustc_compile_action's existing provider-list API for internal and extension callers. rust_test now scans the returned providers to replace DefaultInfo for the wrapper, so extensions such as prost and wasm-bindgen continue to consume rustc_compile_action without API churn. Co-authored-by: Brian Duff <bduff@linkedin.com> Co-authored-by: Codex <noreply@openai.com>
…tc's -Ldependency scan can pick up the _meta.rlib alongside the full '.rlbi', producing undefined-symbol link errors. To avoid this, emit the hollow metadata rlibs into a '_meta/' subdirectory, and add an explicit link to that directory for any metadata-consuming actions. (bazelbuild#17)
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