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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. Rich Felker‏ @RichFelker Jul 17

      Optimization I'd like to see compilers be able to make: if (strlen(s)>100) -> if (strnlen(s,101)>100)

      6 replies 6 retweets 25 likes
      Show this thread
    2. m4c0‏ @m4c0 Jul 17
      Replying to @RichFelker

      That requires a compiler with knowledge over specific fn calls. I can see that easily done on LLVM, but it feels like bloating the compile process. I’d rather see some form of “lint” doing the same thing.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker Jul 17
      Replying to @m4c0

      The std functions are part of the language and gcc and clang already know about them.

      3:15 PM - 17 Jul 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. m4c0‏ @m4c0 Jul 17
          Replying to @RichFelker

          The compiler and the stdlib are independently provided, and the stdlib is technically optional - specially important when dealing with embedded platforms - or an OS kernel.

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker Jul 17
          Replying to @m4c0

          Most is "optional" (not included in the spec) in a freestanding implementation. GCC and clang already honor -ffreestanding for this and omit special treatment of std functions then.

          1 reply 0 retweets 0 likes
        4. Rich Felker‏ @RichFelker Jul 17
          Replying to @RichFelker @m4c0

          If you're compiling a kernel or libc without -ffreestanding that's a bug; they'll already make transformations that can break your code (like recursive self-calls).

          1 reply 0 retweets 0 likes
        5. reabstraction thunk golem‏ @jckarter Jul 18
          Replying to @RichFelker @m4c0

          -ffreestanding may suppress optimizations that introduce new stdlib calls, but isn’t it still UB for a function to be defined with the same name as a stdlib function and not have the same semantics? Dunno if gcc or clang exercise that even if so though

          0 replies 0 retweets 2 likes
        6. End of conversation

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