Narrow C++ toolchain inputs for Rust compilation - #43
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dzbarsky merged 1 commit intoAug 18, 2026
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Summary
all_fileslimited to the Rust sysrootMotivation
Every Rust compilation currently inherits the complete C++ toolchain file set, including compiler headers and unrelated SDK libraries. Linking actions already declare their linker and runtime inputs separately, so carrying the full C++ toolchain through every action unnecessarily expands action inputs.
This keeps non-linking actions narrow without removing the inputs needed by binaries, static and shared libraries, or proc macros.
Upstream draft: bazelbuild#4235