[2/9] feat: allow caching all Rust crate types + atomic output + FORK_LOCK - #2
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…ALLOW_HASH When the SCCACHE_RUST_CRATE_TYPE_ALLOW_HASH environment variable is set, all crate types (bin, dylib, cdylib, proc-macro) become cacheable. The env var value is hashed into the cache key only when unsupported crate types are present, so machines with different linker setups get separate cache entries. This enables per-machine binary crate caching by setting the env var to a machine-specific value (e.g., a hash of the linker toolchain). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
SCCACHE_RUST_CRATE_TYPE_ALLOW_HASHenv var is set, all crate types (bin, dylib, cdylib, proc-macro) become cacheableStack: 2/6