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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Patrick Walton‏ @pcwalton Sep 20

      Periodic reminder: Don’t compile to C.

      9 replies 7 retweets 57 likes
    2. Rich Felker‏ @RichFelker Sep 20
      Replying to @pcwalton

      Why? It's the only way to get native code without only supporting a few popular mainstream platforms.

      2 replies 0 retweets 0 likes
    3. Patrick Walton‏ @pcwalton Sep 20
      Replying to @RichFelker

      Because of undefined behavior, bad error reporting, and never being able to implement proper GC, among other reasons.

      4 replies 0 retweets 7 likes
    4. Rich Felker‏ @RichFelker Sep 20
      Replying to @pcwalton

      If you generate C you can ensure it doesn't have any UB (assuming no interfacing with unsafe arbitrary C code), & can even do GC if you want (but GC is uhg).

      1 reply 0 retweets 0 likes
    5. Patrick Walton‏ @pcwalton Sep 20
      Replying to @RichFelker

      It’s a big pain, though. Signed integer overflow, float<->int casting UB, etc. are all things people often don’t want in their language and makes the generated C really ugly. And you can’t do *good* GC. :) You need stack and register maps, which are impossible in C.

      2 replies 0 retweets 2 likes
    6. reabstraction thunk golem‏ @jckarter Sep 20
      Replying to @pcwalton @RichFelker

      TBF LLVM has a lot of obnoxious UB around float <-> int operations, division, sqrt, etc. too

      4 replies 0 retweets 2 likes
    7. reabstraction thunk golem‏ @jckarter Sep 20
      Replying to @jckarter @pcwalton @RichFelker

      I think, at a higher level, using *any* language as a compiler target requires thorough understanding of the target language semantics—even assembly language

      2 replies 0 retweets 2 likes
      Rich Felker‏ @RichFelker Sep 20
      Replying to @jckarter @pcwalton

      Yes. But if you choose C you support everything. If you choose anything else you support a tiny set.

      1:20 PM - 20 Sep 2018
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Patrick Walton‏ @pcwalton Sep 20
          Replying to @RichFelker @jckarter

          Let’s be fair: LLVM doesn’t support a “tiny set” of targets. It’s a big set.

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker Sep 20
          Replying to @pcwalton @jckarter

          It's really tiny. Only looks big because it covers mainstream ones. Big by % of computers, tiny by % of archs.

          2 replies 0 retweets 0 likes
        4. Patrick Walton‏ @pcwalton Sep 20
          Replying to @RichFelker @jckarter

          I don’t care about % of architectures, I care about % of users :)

          0 replies 0 retweets 1 like
        5. End of conversation
        1. reabstraction thunk golem‏ @jckarter Sep 20
          Replying to @RichFelker @pcwalton

          Sure, but even aside from portability, C has a different set of tradeoffs as a compilation target; it's not necessarily less ideal than other intermediate language targets

          0 replies 0 retweets 0 likes
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