optimize build speed: sccache, CI profile, schemars feature gate#899
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optimize build speed: sccache, CI profile, schemars feature gate#899
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Add .cargo/config.toml with sccache rustc-wrapper for local build caching. Add [profile.ci] inheriting release with thin LTO and 16 codegen-units for faster CI builds. Gate schemars dependency behind "schema" feature in zeph-llm to allow compilation without JsonSchema support. Closes #877, closes #878, closes #879 Epic: #859
The workspace-level sccache rustc-wrapper breaks CI jobs that do not install sccache (cargo deny, CodeQL). Move sccache configuration to local developer setup via docs recommendation.
Workspace sccache config is the goal of #877. The cargo-deny job does not compile code, so override RUSTC_WRAPPER="" to skip sccache lookup during cargo metadata.
Trivy scans a debug binary which differs from production. Switch to --profile ci (thin LTO, 16 codegen-units) for realistic security scanning while remaining faster than full release builds.
Separate build-tests and test jobs so compilation happens once per platform and test binaries run from pre-built archive. Move doc tests to dedicated Linux-only job (platform-independent). Add dev profile optimizations: disable debug info for dependencies, enable split debuginfo for faster macOS linking.
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Without --lib --bins, nextest archive compiles all targets including e2e tests with expectrl, which fails on Windows (is_alive returns bool, not Result). Match the original test job filter.
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Summary
.cargo/config.tomlwith sccacherustc-wrapperfor local build caching[profile.ci]build profile with thin LTO and 16 codegen-units (~2-3x faster CI link time)schemarsdependency behindschemafeature flag (default-on) in zeph-llmDetails
sccache config (#877): Workspace
.cargo/config.tomlsetsrustc-wrapper = "sccache". CI env varRUSTC_WRAPPERtakes priority, so no conflict with existing workflows.CI build profile (#878):
[profile.ci]inherits release withlto = "thin"andcodegen-units = 16. Production release binaries remain unchanged (fat LTO, 1 codegen unit).schemars feature gate (#879):
chat_typed,chat_typed_erased,Extractor,cached_schema, and supporting types gated with#[cfg(feature = "schema")]. zeph-llm compiles cleanly with--no-default-features. Note:ollama-rsstill transitively depends on schemars — the gate benefits isolated zeph-llm consumers.Test plan
cargo +nightly fmt --checkpassescargo clippy --workspace -- -D warningspassescargo nextest run --workspace --lib --bins— 2691 tests passcargo clippy -p zeph-llm --no-default-features -- -D warningspassescargo build --profile ci -p zephbuilds successfullycargo deny checkcleanCloses #877, closes #878, closes #879
Epic: #859