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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    1. Lokathor‏ @Lokathor 28 Mar 2020
      Replying to @SasLuca

      So, is the convention that you define LIB_IMPL once before the "real" include point which actually dumps in the definitions, and the other parts of the code can safely include it to just get the function signatures in scope?

      1 reply 0 retweets 0 likes
    2. Luca Sas‏ @SasLuca 28 Mar 2020
      Replying to @Lokathor

      Here is an article explaining single header libraries: https://nicolashollmann.de/blog/single-header-libraries/ … The only thing I would comment on the article is that the point about single header libraries being slower to compile is not true in my experience :P

      3 replies 1 retweet 4 likes
    3. Lokathor‏ @Lokathor 28 Mar 2020
      Replying to @SasLuca

      Ah, that's mostly what I was expecting based on my limited C knowledge. I don't think they meant that a SHL is slower to compile than a normal lib, I think they meant that a SHL is slower to compile because you're compiling it *at all* instead of using a prebuilt artifact.

      1 reply 0 retweets 0 likes
    4. Luca Sas‏ @SasLuca 28 Mar 2020
      Replying to @Lokathor

      Linking is slower than compiling so I don't think even that is true :))

      1 reply 0 retweets 1 like
    5. Lokathor‏ @Lokathor 28 Mar 2020
      Replying to @SasLuca

      Well, you have to link either way, right? You can't avoid doing a link. So for a "fresh build" of a downstream project, using pre-built artifacts is "zero build + some link" and inserting a SHL is "some build + some link".

      1 reply 0 retweets 0 likes
    6. Luca Sas‏ @SasLuca 28 Mar 2020
      Replying to @Lokathor

      No, with a SHL the library code is just included and compiled alongside your code. When you compile main.c you also compile lib.h with the implementation of the library.

      1 reply 0 retweets 0 likes
    7. Lokathor‏ @Lokathor 28 Mar 2020
      Replying to @SasLuca

      Right, exactly, so a fresh build of the project, such as for CI, must build the SHL implementation code as well as your own code. Whereas if you had a pre-built artifact of the library then you'd skip the compilation of the library code and just build your own code. SHL+P >= 0+P

      1 reply 0 retweets 0 likes
    8. Luca Sas‏ @SasLuca 28 Mar 2020
      Replying to @Lokathor

      I guess it's my bad for assuming a single translation unit build which compiles instantly :))

      1 reply 0 retweets 0 likes
    9. Lokathor‏ @Lokathor 28 Mar 2020
      Replying to @SasLuca

      Regardless of the rest of the organization of the project, if your lib is 10k lines, and your project is 5k lines, SHL is 15k lines compiled and pre-built is 5k lines compiled. Now, with single-translation-unit it might be too fast to notice either way, but it is a difference.

      2 replies 0 retweets 0 likes
    10. Casey Muratori‏ @cmuratori 28 Mar 2020
      Replying to @Lokathor @SasLuca

      This is an incorrect assumption. The compiler seeing all the at once means that no actual linking table is ever constructed, written, read, and resolved. It may often be _significantly_ faster to recompile an entire library than to link against a prebuilt version.

      2 replies 1 retweet 4 likes
      Casey Muratori‏ @cmuratori 28 Mar 2020
      Replying to @cmuratori @Lokathor @SasLuca

      For any particular build, the only way to know whether prebuilt libraries or flat includes is faster is to actually time both ways, or to know a priori that the library has some kind of really pathological compile (not link!) times (like Tensorflow :)

      4:46 PM - 28 Mar 2020
      • 3 Likes
      • cody Andrew J Haman Luca Sas
      1 reply 0 retweets 3 likes
        1. krolli‏ @kroslakma 29 Mar 2020
          Replying to @cmuratori @Lokathor

          pic.twitter.com/wGbNMXTRGW

          0 replies 4 retweets 25 likes
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