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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. Odin Holmes‏ @odinthenerd Aug 28
      Replying to @RichFelker @jfbastien and

      actually, that's one of the domains I work in (hard real-time bare metal uC stuff). Although tooling/vendor support can be pretty bad once you get it running there are many advantages to C++. First of all, it can be more efficient than C because of constexpr and stricter aliasing

      2 replies 1 retweet 3 likes
    2. Steve Canon‏ @stephentyrone Aug 28
      Replying to @odinthenerd @RichFelker and

      The tooling thing is a really hard obstacle for anyone providing libraries that target semi-arbitrary platforms (like @RichFelker does). C support isn't perfect with weird compilers either, but it's much, much more dependable than C++ (and especially the C++ stdlib).

      2 replies 0 retweets 4 likes
    3. Steve Canon‏ @stephentyrone Aug 28
      Replying to @stephentyrone @odinthenerd and

      Given a choice between writing almost-C++03 and writing almost-C99, a sane person will choose almost-C99 every time. Newer C++ standards have a ton to offer, *if you can count on it being available*. It's easy to forget just how bad old semi-correct C++ can be.

      2 replies 0 retweets 3 likes
    4. Steve Canon‏ @stephentyrone Aug 28
      Replying to @stephentyrone @odinthenerd and

      Of particular note, with a lot of half-baked toolchains, many supposedly guaranteed things that modern C++ depends on for "zero cost abstractions" are not actually guaranteed.

      1 reply 0 retweets 3 likes
    5. JF Bastien‏ @jfbastien Aug 28
      Replying to @stephentyrone @odinthenerd and

      Sounds like something fixed by a transpiler ecosystem like JavaScript has. Babel to translate to older language versions, Web pack to make everything tiny, etc. A bunch of fancy / trendy libraries like React and Angular, stories of Ye Olden frameworks like JQuery, and 🎉😎🎊

      3 replies 0 retweets 0 likes
    6. Steve Canon‏ @stephentyrone Aug 28
      Replying to @jfbastien @odinthenerd and

      AAAAAAAAAAAAAAAAAH

      1 reply 0 retweets 2 likes
    7. JF Bastien‏ @jfbastien Aug 28
      Replying to @stephentyrone @odinthenerd and

      I know you're fond of assembly so "H" stands for "hexadecimal"... but that's 17 nibbles so I don't think it's valid on most platforms...

      1 reply 0 retweets 2 likes
    8. Steve Canon‏ @stephentyrone Aug 28
      Replying to @jfbastien @odinthenerd and

      Give me extended integer types already.

      2 replies 0 retweets 0 likes
    9. JF Bastien‏ @jfbastien Aug 28
      Replying to @stephentyrone @odinthenerd and

      Yeah it bugs me that __int128 doesn't have a defined suffix. I filed an LLDB bug about it and @fred_riss sent it back to me! 😭

      1 reply 0 retweets 3 likes
    10. Steve Canon‏ @stephentyrone Aug 28
      Replying to @jfbastien @odinthenerd and

      We shouldn't need a suffix. Just a warning that it's not portable and maybe reject it in -std=cxx.

      2 replies 0 retweets 2 likes
      Rich Felker‏ @RichFelker Aug 28
      Replying to @stephentyrone @jfbastien and

      Rejecting is a problem because aarch64 went and made it part of the ABI for their ucontext structure and maybe other things...

      9:08 AM - 28 Aug 2018
      • 1 Like
      • Odin Holmes
      1 reply 0 retweets 1 like
        1. New conversation
        2. Steve Canon‏ @stephentyrone Aug 28
          Replying to @RichFelker @jfbastien and

          If the type exists, you don't need to reject it. But it would need to exist as a full-blown integer type in standards mode.

          3 replies 0 retweets 0 likes
        3. Brendan G Bohannon‏ @cr88192 Aug 28
          Replying to @stephentyrone @RichFelker and

          Lacking a good suffix for __int128, in my C compiler (mostly used for targeting my own experimental ISA designs) I just went with LLX / ULLX.

          1 reply 0 retweets 1 like
        4. Steve Canon‏ @stephentyrone Aug 28
          Replying to @cr88192 @RichFelker and

          I did really have int128 literal support in clang for a while, under the bogus "Microsoft extension" suffix [u]i128 (which doesn't actually exist in any Microsoft compiler, but the parser was there). It's been removed though =/

          2 replies 0 retweets 2 likes
        5. Rich Felker‏ @RichFelker Aug 28
          Replying to @stephentyrone @cr88192 and

          There are likely all sorts of problems with doing it, like how it behaves in #if...

          1 reply 0 retweets 0 likes
        6. Steve Canon‏ @stephentyrone Aug 28
          Replying to @RichFelker @cr88192 and

          It worked great! The only major issue was the formal semantics issues around extended types and intmax, as you sketched out.

          2 replies 0 retweets 1 like
        7. Rich Felker‏ @RichFelker Aug 28
          Replying to @stephentyrone @cr88192 and

          But preprocessor requires all arithmetic take place in a common signed or unsigned type matching [u]intmax_t...

          1 reply 0 retweets 0 likes
        8. Steve Canon‏ @stephentyrone Aug 28
          Replying to @RichFelker @cr88192 and

          As I said, the only real issue is around intmax.

          1 reply 0 retweets 0 likes
        9. Rich Felker‏ @RichFelker Aug 28
          Replying to @stephentyrone @cr88192 and

          Even without stdint.h and intmax_t, though, you'd run into the same problem with consistently defining what's supposed to happen at the preprocessor level...

          1 reply 0 retweets 0 likes
        10. 12 more replies

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