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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. John Regehr‏ @johnregehr 12 Feb 2016

      John Regehr Retweeted Alexander Cherepanov

      strict aliasing is even worse than I thoughthttps://twitter.com/ch3root/status/697939734165901312 …

      John Regehr added,

      Alexander Cherepanov @ch3root
      Strict aliasing rules are hard -- https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69776 …
      3 replies 7 retweets 10 likes
    2. Rustacean::from("")‏ @H2CO3_iOS 12 Feb 2016
      Replying to @johnregehr

      @johnregehr wait, isn't that plain old undefined behavior? so why would one expect the compiler to do "the right thing"?

      1 reply 0 retweets 1 like
    3. John Regehr‏ @johnregehr 12 Feb 2016
      Replying to @H2CO3_iOS

      @H2CO3_iOS effective type should be determined by the most recent store

      1 reply 0 retweets 0 likes
    4. Rustacean::from("")‏ @H2CO3_iOS 12 Feb 2016
      Replying to @johnregehr

      @johnregehr so we are allowed to *change* the effective type? I though that already counted as a violation of strict aliasing.

      1 reply 0 retweets 0 likes
    5. John Regehr‏ @johnregehr 12 Feb 2016
      Replying to @H2CO3_iOS

      @H2CO3_iOS yes, storage from malloc can have different effective types at different times

      2 replies 1 retweet 2 likes
    6. Rich Felker‏ @RichFelker 12 Feb 2016
      Replying to @johnregehr

      @johnregehr @H2CO3_iOS Where is the language that says effective type can change? Sounds like wishful thinking on your part.

      3 replies 0 retweets 0 likes
    7. friend void‏ @volatile_void 12 Feb 2016
      Replying to @RichFelker

      @RichFelker sorry to insist, but are you saying that the arguments in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69776#c2 … are wrong?

      2 replies 0 retweets 1 like
      Rich Felker‏ @RichFelker 12 Feb 2016
      Replying to @volatile_void

      @spun_off No, just that I was unaware that it's actually well-defined to repurpose allocated memory after it gets an effective type.

      10:26 AM - 12 Feb 2016
      1 reply 0 retweets 0 likes
        1. Rich Felker‏ @RichFelker 12 Feb 2016
          Replying to @RichFelker

          @spun_off I wrongly assumed it was a sort of "gray area" people just assumed would work without justification.

          0 replies 0 retweets 0 likes
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