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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. @landley‏ @landley 2 Jun 2017
      Replying to @RichFelker @johnregehr @sevenps

      C is a portable Assembly Language. An optimizer changing its meaning is broken.

      1 reply 0 retweets 0 likes
    2. friend void‏ @volatile_void 2 Jun 2017
      Replying to @landley @RichFelker and

      You will need to find someone to make a compiler for that “portable assembly” you speak of. Personally I don't know any.

      2 replies 0 retweets 2 likes
    3. @landley‏ @landley 2 Jun 2017
      Replying to @volatile_void @RichFelker and

      https://landley.net/qcc  is on my todo list.

      1 reply 0 retweets 2 likes
    4. Rich Felker‏ @RichFelker 2 Jun 2017
      Replying to @landley @johnregehr @sevenps

      You really have much better things to do with your skills...

      1 reply 0 retweets 0 likes
    5. @landley‏ @landley 2 Jun 2017
      Replying to @RichFelker @johnregehr @sevenps

      Define "better". If you want to program in something other than C, there's plenty of options. There's no excuse for breaking C.

      1 reply 0 retweets 0 likes
    6. Rich Felker‏ @RichFelker 2 Jun 2017
      Replying to @landley @johnregehr @sevenps

      I mean better than writing a compiler that produces output 100-1000x slower that's useless except as a way to express disagreement w/C.

      1 reply 0 retweets 0 likes
    7. @landley‏ @landley 2 Jun 2017
      Replying to @RichFelker @johnregehr @sevenps

      I disagree with your premise, but it's too long for twitter.

      1 reply 0 retweets 0 likes
    8. @landley‏ @landley 2 Jun 2017
      Replying to @landley @RichFelker and

      And as I said at the start, typecasting them to longs works just fine. http://www.unix.org/whitepapers/64bit.html …

      1 reply 0 retweets 0 likes
    9. Rich Felker‏ @RichFelker 2 Jun 2017
      Replying to @landley @johnregehr @sevenps

      It doesn't. If (32-bit) p=0x7fffffff, q=0x80000000 (same array), q-p is perfectly well-defined but (long)q-(long)p is not.

      2 replies 0 retweets 0 likes
    10. @landley‏ @landley 2 Jun 2017
      Replying to @RichFelker @johnregehr @sevenps

      P.S. posix requires one's complement. This has come up before. http://lists.uclibc.org/pipermail/busybox/2017-February/085201.html …

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 2 Jun 2017
      Replying to @landley @johnregehr @sevenps

      You mean twos complement, and it doesn't, but twos complement is not relevant here. All that's relevant is that it's undefined.

      12:00 PM - 2 Jun 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Rich Felker‏ @RichFelker 2 Jun 2017
          Replying to @RichFelker @landley and

          Ideal implementations are equivalent to gcc's (maybe-broken?) -ftrapv, i.e. catching overflows to reduce serious bugs down to DoS.

          1 reply 0 retweets 0 likes
        3. Brendan G Bohannon‏ @cr88192 2 Jun 2017
          Replying to @RichFelker @landley and

          FWIW: I think ideally things should both define signed types as twos complement, and also maybe support explicit trap&saturate for types...

          0 replies 0 retweets 0 likes
        4. End of conversation

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