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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. Jonas Termansen‏ @sortiecat Jul 3

      carray(1) is a tiny but flexible Sortix program that turns a binary file into a C file <https://sortix.org/man/man1/carray.1.html …> <https://gitlab.com/sortix/sortix/blob/master/carray/carray.c …> $ echo foo > bar $ carray bar unsigned char bar[] = { 0x66, 0x6F, 0x6F, 0x0A, };

      5 replies 1 retweet 9 likes
      Show this thread
    2. Rich Felker‏ @RichFelker Jul 3
      Replying to @sortiecat

      There are similar tools in https://github.com/richfelker/musl-chartable-tools …, but one particular thing I chose to do differently was not to put the outer declaration/braces inside the output file. Instead you #include it between the braces.

      2 replies 0 retweets 2 likes
    3. Elazar Leibovich‏ @elazarl Jul 4
      Replying to @RichFelker @sortiecat

      why not objcopy (generate the ELF directly), xxd --include and such. Why reinvent existing thing? At least grab their relevant piece of code, or stick to their syntax people already know.

      1 reply 0 retweets 0 likes
    4. Rich Felker‏ @RichFelker Jul 4
      Replying to @elazarl @sortiecat

      There are very very good reasons not to do the objcopy stuff. It's an awful hack that should be forgotten except as reminder not to reinvent it.

      1 reply 0 retweets 2 likes
    5. Elazar Leibovich‏ @elazarl Jul 4
      Replying to @RichFelker @sortiecat

      Can you please explain more? I liked the idea, since the old C compiler collapsed when I gave him a very long static array. Resorted to asm .data

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker Jul 4
      Replying to @elazarl @sortiecat

      Asm .data is less awful than objcopy, but still nonportable and inherently hides the content of the data from the compiler (preventing static analysis of correctness aspects and value range based optimization).

      6:46 AM - 4 Jul 2018
      • 1 Retweet
      • 1 Like
      • Jonas Termansen
      1 reply 1 retweet 1 like
        1. New conversation
        2. Rich Felker‏ @RichFelker Jul 4
          Replying to @RichFelker @elazarl @sortiecat

          Can't find the thread at the moment, but it was recently discussed that huge array blows up gcc's ast but huge string avoids it. Ugly but works.

          2 replies 0 retweets 0 likes
        3. Jonas Termansen‏ @sortiecat Jul 4
          Replying to @RichFelker @elazarl

          Does that workaround also work for line broken strings, say 80 column implicitly appended strings? But really, a compiler benchmark is needed and then an efficient representation in the compiler.

          0 replies 0 retweets 0 likes
        4. End of conversation

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