3 ms·

Maybe your build is not limited by code generation, which seems like the only thing that changed here. There was a good thread recently about the variation in w

• diggan 3y ago
  Edited my comment now, forgot I was caching the release builds with sccache so wasn't actually compiling all the units, but fetching a lot of them instead :/
  • vlovich123 3y ago
    Which speaks to maybe that cargo should just ship with sccache turned on by default so that the “normal” experience for developing Rust has this seamless experience. Intelligent caching should always win. I’d like to see rustc get sccache integration that works at the MIR level too so that changing something that doesn’t change the code gen meaningfully still gets a cached response (e.g. changing some comments/whitespace, moving functions around, etc). Even cooler would be if LLVM itself could also cache internal expensive parts of compilation and optimization across process instances. That would make a huge impact in cutting down incremental builds.
    • SkiFire13 3y ago
      > I’d like to see rustc get sccache integration that works at the MIR level too so that changing something that doesn’t change the code gen meaningfully still gets a cached response (e.g. changing some comments/whitespace, moving functions around, etc). Isn't incremental compilation already like that?