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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. Patrick Walton‏ @pcwalton 23 Apr 2019
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      Replying to @BRIAN_____ @sayrer and

      Also, debug file/line info in DWARF. Yes, I agree there’s room for improvement here. But it’s *compiler* work, not build system work. That’s my entire point.

      2 replies 0 retweets 1 like
    2. Sam Tobin-Hochstadt‏ @samth 23 Apr 2019
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      Replying to @pcwalton @BRIAN_____ and

      You can fix this in the build system, if you can write a function that produces the data the downstream consumer cares about so it can be hashed. Not saying that's the best approach, since I don't know the rest of the context.

      1 reply 0 retweets 1 like
    3. Patrick Walton‏ @pcwalton 23 Apr 2019
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      Replying to @samth @BRIAN_____ and

      Yes, that’s what I was saying earlier. My point is that writing those incremental compilation hooks is the hard part, and is compiler work that has to happen before we can even talk about build systems. (And adding that support to Cargo/rustbuild is easy.)

      2 replies 0 retweets 1 like
    4. Sam Tobin-Hochstadt‏ @samth 23 Apr 2019
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      Replying to @pcwalton @BRIAN_____ and

      My suggestion is to use a dwarf parser to generate the hash without touching the compiler. That might require making the build system, not cargo, drive rustc though.

      1 reply 0 retweets 0 likes
    5. Mike Shaver‏ @shaver 23 Apr 2019
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      Replying to @samth @pcwalton and

      Yeah, that’s what I was trying to say earlier, but didn’t make it clear.

      1 reply 0 retweets 0 likes
    6. Manish‏ @ManishEarth 23 Apr 2019
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      Replying to @shaver @samth and

      DWARF doesn't contain type-level dependency edges (especially once you throw specialization in the mix) Rust's dwarf generation is good, but i wouldn't trust it for incremental compilation

      1 reply 0 retweets 0 likes
    7. Sam Tobin-Hochstadt‏ @samth 23 Apr 2019
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      Replying to @ManishEarth @shaver and

      Right it's not anything like a complete solution but it should fix the doc comment issue (I would hope).

      1 reply 0 retweets 0 likes
    8. Manish‏ @ManishEarth 23 Apr 2019
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      Replying to @samth @shaver and

      not really, because you can't rely on DWARF to know that no code changed. you can query the compiler, of course, but this circles back to patrick's point

      1 reply 0 retweets 0 likes
    9. Sam Tobin-Hochstadt‏ @samth 23 Apr 2019
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      Replying to @ManishEarth @shaver and

      I'm confused. If you strip all the debug info, etc, and hash that, you can see if nothing changed in the actual code, right?

      2 replies 0 retweets 0 likes
    10. Patrick Walton‏ @pcwalton 23 Apr 2019
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      Replying to @samth @ManishEarth and

      Yes (I think), but we could also just fix it at the incremental compilation level, which would be faster because we wouldn’t have to hash so much.

      1 reply 0 retweets 0 likes
      Patrick Walton‏ @pcwalton 23 Apr 2019
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      Replying to @pcwalton @samth and

      We have a sophisticated framework for dependency tracking already. It’s more sophisticated than almost anything out there, including Bazel’s file-level tracking. It even knows to only run *some* of the passes of the compiler when it can. Let’s use it.

      3:37 PM - 23 Apr 2019
      • 3 Likes
      • Wesley Wiser kornel@mastodon.social Manish
      0 replies 0 retweets 3 likes
        1. New conversation
        2. Patrick Walton‏ @pcwalton 23 Apr 2019
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          Replying to @BRIAN_____ @samth and

          Well, I’m not on the Cargo subteam. Personally I think we should do something to make build scripts smarter, because sometimes (not commonly IME) it becomes a pain. I don’t know what the right solution is.

          0 replies 0 retweets 1 like
        3. End of conversation

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