Commits on Jul 12, 2020

1. Don't spend build time optimizing build-time-only crates …

   Crates used exclusively at build time, such as proc-macro crates and
   their dependencies, don't benefit substantially from optimization; they
   take far longer to optimize than time saved when running them during the
   build. No machine code from these crates will appear in the final
   compiled binary.
   
   Use the new profile-overrides mechanism in Rust 1.41
   (https://doc.rust-lang.org/cargo/reference/profiles.html#overrides) to
   build such crates with opt-level 0.
   
   This substantially speeds up build time.

   

   joshtriplett committed Jul 12, 2020
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