Add experimental_rustc_incremental flag#18
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Add support for tier 3 targets bpfeb-unknown-none and bpfel-unknown-none (see https://github.com/rust-lang/rust/blob/f5e2df7/src/doc/rustc/src/platform-support.md?plain=1#L311-L312). This is modeled after bazelbuild#3507 and should probably be updated if/when bazelbuild/platforms#131 is merged. (please use rebase merge when landing this as the proper commit message is in the commit, rather than the PR description) /cc @avrabe
…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>
Keep cargo build script inputs available to their direct dependent without propagating them through transitive Rustc inputs. compile_data remains reserved for files that need to stay available to downstream consumers, such as generated link inputs. Update the existing cargo_build_script propagation test to distinguish the direct-dependent case from the transitive case. Co-authored-by: Codex <noreply@openai.com>
) * When '--strategy=Rustc=local' is used with pipelined compilation, rustc'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) * Add RUSTC_BOOTSTRAP guardrail for -Zno-codegen pipelining Injects RUSTC_BOOTSTRAP=1 + -Zallow-features= (empty list) on the metadata and full compile actions when pipelined_compilation is enabled on a stable/beta toolchain. The bootstrap env is required for -Zno-codegen on non-nightly rustc and must match across both actions for SVH compatibility. The empty allow-features list prevents the bootstrap env from silently unlocking #![feature(...)] in user code. Nightly toolchains skip both injections: unstable features are already allowed, and the guardrail would break legitimate #![feature(...)] usage. Escape hatch: if the user sets RUSTC_BOOTSTRAP in rustc_env / shell env or passes -Zallow-features=... via rustc_flags / extra_rustc_flag, rules_rust treats their configuration as authoritative and skips both injections. Tests: - //test/pipelining_bootstrap_gate: manual target that #![feature(trait_alias)] to validate E0725 fires on stable under the guardrail. - //test/unit/pipelined_compilation: guardrail_{baseline,user_env,user_flag, space_form,global_env,global_flag}_optout_test variants.
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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